[issue47152] Reorganize the re module sources
Matthew Barnett added the comment: For reference, I also implemented .regs in the regex module for compatibility, but I've never used it myself. I had to do some investigating to find out what it did! It returns a tuple of the spans of the groups. Perhaps I might have used it if it didn't have such a cryptic name and/or was documented. -- ___ Python tracker <https://bugs.python.org/issue47152> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue47081] Replace "qualifiers" with "quantifiers" in the re module documentation
Matthew Barnett added the comment: I don't think it's a typo, and you could argue the case for "qualifiers", but I still agree with the proposal as it's a more meaningful term in the context. -- ___ Python tracker <https://bugs.python.org/issue47081> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue47023] re.sub shows key error on regex escape chars provided in repl param
Matthew Barnett added the comment: I'd just like to point out that to a user it could _look_ like a bug, that an error occurred while reporting, because the traceback isn't giving a 'clean' report; the stuff about the KeyError is an internal detail. -- ___ Python tracker <https://bugs.python.org/issue47023> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue46825] slow matching on regular expression
Matthew Barnett added the comment: The expression is a repeated alternative where the first alternative is a repeat. Repeated repeats can result in a lot of attempts and backtracking and should be avoided. Try this instead: (0|1(01*0)*1)+ -- ___ Python tracker <https://bugs.python.org/issue46825> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue46627] Regex hangs indefinitely
Matthew Barnett added the comment: That pattern has: (?P[^]]+)+ Is that intentional? It looks wrong to me. -- ___ Python tracker <https://bugs.python.org/issue46627> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue46515] Benefits Of Phool Makhana
Change by Matthew Barnett : -- stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue46515> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue46410] TypeError when parsing regexp with unicode named character sequence escape
Matthew Barnett added the comment:
They're not supported in string literals either:
Python 3.10.1 (tags/v3.10.1:2cd268a, Dec 6 2021, 19:10:37) [MSC v.1929 64 bit
(AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> "\N{KEYCAP NUMBER SIGN}"
File "", line 1
"\N{KEYCAP NUMBER SIGN}"
^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in
position 0-21: unknown Unicode character name
--
___
Python tracker
<https://bugs.python.org/issue46410>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue45899] NameError on if clause of class-level list comprehension
Matthew Barnett added the comment: It's not just in the 'if' clause: >>> class Foo: ... a = ['a', 'b'] ... b = ['b', 'c'] ... c = [b for x in a] ... Traceback (most recent call last): File "", line 1, in File "", line 4, in Foo File "", line 4, in NameError: name 'b' is not defined -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue45899> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue45869] Unicode and acii regular expressions do not agree on ascii space characters
Matthew Barnett added the comment:
For comparison, the regex module says that 0x1C..0x1F aren't whitespace, and
the Unicode property White_Space ("\p{White_Space}" in a pattern, where
supported) also says that they aren't whitespace.
--
___
Python tracker
<https://bugs.python.org/issue45869>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue45539] Negative lookaround assertions sometimes leak capture groups
Matthew Barnett added the comment: It's definitely a bug. In order for the pattern to match, the negative lookaround must match, which means that its subexpression mustn't match, so none of the groups in that subexpression have captured. -- versions: +Python 3.10 ___ Python tracker <https://bugs.python.org/issue45539> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue45461] UnicodeDecodeError: 'unicodeescape' codec can't decode byte 0x5c in position 8191: \ at end of string
Matthew Barnett added the comment:
It can be shortened to this:
buffer = b"a" * 8191 + b"\\r\\n"
with open("bug_csv.csv", "wb") as f:
f.write(buffer)
with open("bug_csv.csv", encoding="unicode_escape", newline="") as f:
f.readline()
To me it looks like it's reading in blocks of 8K and then decoding them, but
it isn't correctly handling an escape sequence that happens to cross a block
boundary.
--
nosy: +mrabarnett
___
Python tracker
<https://bugs.python.org/issue45461>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue45155] Add default arguments for int.to_bytes()
Matthew Barnett added the comment: I wonder whether there should be a couple of other endianness values, namely, "native" and "network", for those cases where you want to be explicit about it. If you use "big" it's not clear whether that's because you want network endianness or because the platform is big-endian. -- ___ Python tracker <https://bugs.python.org/issue45155> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue45155] Add default arguments for int.to_bytes()
Matthew Barnett added the comment: I'd probably say "In the face of ambiguity, refuse the temptation to guess". As there's disagreement about the 'correct' default, make it None and require either "big" or "little" if length > 1 (the default). -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue45155> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue44699] Simple regex appears to take exponential time in length of input
Matthew Barnett added the comment: It's called "catastrophic backtracking". Think of the number of ways it could match, say, 4 characters: 4, 3+1, 2+2, 2+1+1, 1+3, 1+2+1, 1+1+2, 1+1+1+1. Now try 5 characters... -- ___ Python tracker <https://bugs.python.org/issue44699> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue28937] str.split(): allow removing empty strings (when sep is not None)
Matthew Barnett added the comment:
I've only just realised that the test cases don't cover all eventualities: none
of them test what happens with multiple spaces _between_ the letters, such as:
' a b c '.split(maxsplit=1) == ['a', 'b c ']
Comparing that with:
' a b c '.split(' ', maxsplit=1)
you see that passing None as the split character does not mean "any whitespace
character". There's clearly a little more to it than that.
--
___
Python tracker
<https://bugs.python.org/issue28937>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue28937] str.split(): allow removing empty strings (when sep is not None)
Matthew Barnett added the comment: We have that already, although it's spelled: ' x y z'.split(maxsplit=1) == ['x', 'y z'] because the keepempty option doesn't exist yet. -- ___ Python tracker <https://bugs.python.org/issue28937> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue28937] str.split(): allow removing empty strings (when sep is not None)
Matthew Barnett added the comment:
The best way to think of it is that .split() is like .split(' '), except that
it's splitting on any whitespace character instead of just ' ', and keepempty
is defaulting to False instead of True.
Therefore:
' x y z'.split(maxsplit=1, keepempty=True) == ['', ' x y z']
because:
' x y z'.split(' ', maxsplit=1) == ['', ' x y z']
but:
' x y z'.split(maxsplit=1, keepempty=False) == ['x y z']
At least, I think that's the case!
--
___
Python tracker
<https://bugs.python.org/issue28937>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue28937] str.split(): allow removing empty strings (when sep is not None)
Matthew Barnett added the comment: The case: ' a b c '.split(maxsplit=1) == ['a', 'b c '] suggests that empty strings don't count towards maxsplit, otherwise it would return [' a b c '] (i.e. the split would give ['', ' a b c '] and dropping the empty strings would give [' a b c ']). -- ___ Python tracker <https://bugs.python.org/issue28937> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43714] re.split(), re.sub(): '\Z' must consume end of string if it matched
Matthew Barnett added the comment: Do any other regex implementations behave the way you want? In my experience, there's no single "correct" way for a regex to behave; different implementations might give slightly different results, so if the most common ones behave a certain way, then that's the de facto standard, even if it not what you'd expect or want. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue43714> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43535] Make str.join auto-convert inputs to strings.
Matthew Barnett added the comment: I'm also -1, for the same reason as Serhiy gave. However, if it was opt-in, then I'd be OK with it. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue43535> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43156] Python windows installer has a confusing name - add setup to its name
Matthew Barnett added the comment: Sorry to bikeshed, but I think it would be clearer to keep the version next to the "python" and the "setup" at the end: python-3.10.0a5-win32-setup.exe python-3.10.0a5-win64-setup.exe -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue43156> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42871] Regex compilation crashed if I change order of alternatives under quantifier
Matthew Barnett added the comment: Example 1: ((a)|b\2)* ^^^ Group 2 ((a)|b\2)* ^^ Reference to group 2 The reference refers backwards to the group. Example 2: (b\2|(a))* ^^^ Group 2 (b\2|(a))* ^^ Reference to group 2 The reference refers forwards to the group. As I said, the re module doesn't support forward references to groups. If you have a regex where forward references are unavoidable, try the 3rd-party 'regex' module instead. It's available on PyPI. -- ___ Python tracker <https://bugs.python.org/issue42871> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42871] Regex compilation crashed if I change order of alternatives under quantifier
Matthew Barnett added the comment: It's not a crash. It's complaining that you're referring to group 2 before defining it. The re module doesn't support forward references to groups, but only backward references to them. -- ___ Python tracker <https://bugs.python.org/issue42871> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42668] re.escape does not correctly escape newlines
Matthew Barnett added the comment: In a regex, putting a backslash before any character that's not an ASCII-range letter or digit makes it a literal. re.escape doesn't special-case control characters. Its purpose is to make a string that might contain metacharacters into one that's a literal, and it already does that, although it sometimes escapes more than necessary. -- ___ Python tracker <https://bugs.python.org/issue42668> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42475] wrongly cache pattern by re.compile
Matthew Barnett added the comment: That behaviour has nothing to do with re. This line: samples = filter(lambda sample: not pttn.match(sample), data) creates a generator that, when evaluated, will use the value of 'pttn' _at that time_. However, you then bind 'pttn' to something else. Here's a simple example: >>> x = 1 >>> func = lambda: print(x) >>> func() 1 >>> x = 2 >>> func() 2 A workaround is to capture the current value with a default argument: >>> x = 1 >>> func = lambda x=x: print(x) >>> func() 1 >>> x = 2 >>> func() 1 -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue42475> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42473] re.sub ignores flag re.M
Matthew Barnett added the comment: Not a bug. Argument 4 of re.sub is the count: sub(pattern, repl, string, count=0, flags=0) not the flags. -- nosy: +mrabarnett resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue42473> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41885] Unexpected behavior re.sub() with raw f-strings
Matthew Barnett added the comment:
Arguments are evaluated first and then the results are passed to the function.
That's true throughout the language.
In this instance, you can use \g<1> in the replacement string to refer to group
1:
re.sub(r'([a-z]+)', fr"\g<1>{REPLACEMENT}", 'something')
--
___
Python tracker
<https://bugs.python.org/issue41885>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41764] sub function would not work without the flags but the search would work fine
Matthew Barnett added the comment:
The arguments are: re.sub(pattern, repl, string, count=0, flags=0).
Therefore:
re.sub("pattern","replace", txt, re.IGNORECASE | re.DOTALL)
is passing re.IGNORECASE | re.DOTALL as the count, not the flags.
It's in the documentation and the interactive help.
--
resolution: -> not a bug
stage: -> resolved
status: open -> closed
___
Python tracker
<https://bugs.python.org/issue41764>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41664] re.sub does NOT substitute all the matching patterns when re.IGNORECASE is used
Matthew Barnett added the comment: The 4th argument of re.sub is 'count', not 'flags'. re.IGNORECASE has the numeric value of 2, so: re.sub(r'[aeiou]', '#', 'all is fair in love and war', re.IGNORECASE) is equivalent to: re.sub(r'[aeiou]', '#', 'all is fair in love and war', count=2) -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue41664> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue41531] Python 3.9 regression: Literal dict with > 65535 items are one item shorter
Matthew Barnett added the comment: I think what's happening is that in 'compiler_dict' (Python/compile.c), it's checking whether 'elements' has reached a maximum (0x). However, it's not doing this after incrementing; instead, it's checking before incrementing and resetting 'elements' to 0 when it should be resetting to 1. The 65535th element isn't counted. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue41531> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40043] RegExp Conditional Construct (?(id/name)yes-pattern|no-pattern) Problem
Matthew Barnett added the comment: That's what searching does! Does the pattern match here? If not, advance by one character and try again. Repeat until a match is found or you've reached the end. -- ___ Python tracker <https://bugs.python.org/issue40043> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40043] RegExp Conditional Construct (?(id/name)yes-pattern|no-pattern) Problem
Matthew Barnett added the comment: The documentation is talking about whether it'll match at the current position in the string. It's not a bug. -- resolution: -> not a bug ___ Python tracker <https://bugs.python.org/issue40043> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40027] re.sub inconsistency beginning with 3.7
Matthew Barnett added the comment: Duplicate of Issue39687. See https://docs.python.org/3/library/re.html#re.sub and https://docs.python.org/3/whatsnew/3.7.html#changes-in-the-python-api. -- resolution: -> duplicate stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue40027> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38826] Regular Expression Denial of Service in urllib.request.AbstractBasicAuthHandler
Matthew Barnett added the comment: A smaller change to the regex would be to replace the "(?:.*,)*" with "(?:[^,]*,)*". I'd also suggest using a raw string instead: rx = re.compile(r'''(?:[^,]*,)*[ \t]*([^ \t]+)[ \t]+realm=(["']?)([^"']*)\2''', re.I) -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue38826> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39436] Strange behavior of comparing int and float numbers
Change by Matthew Barnett : -- stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue39436> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39436] Strange behavior of comparing int and float numbers
Matthew Barnett added the comment: Python floats have 53 bits of precision, so ints larger than 2**53 will lose their lower bits (assumed to be 0) when converted. -- nosy: +mrabarnett resolution: -> not a bug ___ Python tracker <https://bugs.python.org/issue39436> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38974] using filedialog.askopenfilename() freezes python 3.8
Matthew Barnett added the comment: I've just tried it on Windows 10 with Python 3.8 64-bit and Python 3.8 32-bit without issue. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue38974> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38764] Deterministic globbing.
Matthew Barnett added the comment: I could also add: would sorting be case-sensitive or case-insensitive? Windows is case-insensitive, Linux is case-sensitive. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue38764> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23692] Undocumented feature prevents re module from finding certain matches
Matthew Barnett added the comment:
It's been many years since I looked at the code, and there have been changes
since then, so some of the details might not be correct.
As to have it should behave:
re.match('(?:()|(?(1)()|z)){1,2}(?(2)a|z)', 'a')
Iteration 1.
Match the repeated part. Group 1 matches.
Iteration 2.
Match the repeated part. Group 1 matches.
Has group 2 matched? No.
Try to match 'z'. Fail and backtrack.
Retry the repeated part.
Iteration 2.
Has group 1 matched? Yes.
Group 2 matches.
Has group 2 matched? Yes.
Try to match 'a'. Success. Group 1 matched and group 2 matched.
re.match('(?:()|(?(1)()|z)){1,2}(?(1)a|z)', 'a')
Iteration 1.
Match the repeated part. Group 1 matches.
Iteration 2.
Match the repeated part. Group 1 matches.
Has group 1 matched? Yes.
Try to match 'a'. Success. Group 1 matched and group 2 didn't match.
--
___
Python tracker
<https://bugs.python.org/issue23692>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23692] Undocumented feature prevents re module from finding certain matches
Matthew Barnett added the comment:
Suppose you had a pattern:
.*
It would advance one character on each iteration of the * until the . failed to
match. The text is finite, so it would stop matching eventually.
Now suppose you had a pattern:
(?:)*
On each iteration of the * it wouldn't advance, so it would keep matching
forever.
A way to avoid that is to stop the * if it hasn't advanced.
The example pattern shows that there's still a problem. It advances if a group
has matched, but that group doens't match until the first iteration, after the
test, and does not, itself, advance. The * stops because it hasn't advanced,
but, in this instance, that doesn't mean it never will.
The solution is for the * to check not only whether it has advanced, but also
whether a group has changed. (Strictly speaking, the latter check is needed
only if the repeated part tests whether a group also in the repeated part has
changed, but it's probably not worth "optimising" for that possibility.)
In the regex module, it increments a "capture changed" counter whenever any
group is changed (a group's first match or a change to a group's span). That
makes it easier for the * to check. The code needs to save that counter for
backtracking and restore it when backtracking.
I've mentioned only the *, but the same remarks apply to + and {...}, except
that the {...} should keep repeating until it has reached its prescribed
minimum.
--
___
Python tracker
<https://bugs.python.org/issue23692>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38582] re: backreference number in replace string can't >= 100
Matthew Barnett added the comment: If we did decide to remove it, but there was still a demand for octal escapes, then I'd suggest introducing \oXXX. -- ___ Python tracker <https://bugs.python.org/issue38582> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38582] re: backreference number in replace string can't >= 100
Matthew Barnett added the comment: A numeric escape of 3 digits is an octal (base 8) escape; the octal escape "\100" gives the same character as the hexadecimal escape "\x40". In a replacement template, you can use "\g<100>" if you want group 100 because \g<...> accepts both numeric and named group references. However, \g<...> is not accepted in a pattern. (By the way, in the "regex" module I added support for it in a pattern too.) -- ___ Python tracker <https://bugs.python.org/issue38582> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37996] 2to3 introduces unwanted extra backslashes for unicode characters in regular expressions
Matthew Barnett added the comment: You wrote "the u had already been removed by hand". By removing the u in the _Python 2_ code, you changed that string from a Unicode string to a bytestring. In a bytestring, \u is not an escape; b"\u" == b"\\u". -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue37996> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37723] important performance regression on regular expression parsing
Matthew Barnett added the comment: I've just had a look at _uniq, and the code surprises me. The obvious way to detect duplicates is with a set, but that requires the items to be hashable. Are they? Well, the first line of the function uses 'set', so they are. Why, then, isn't it using a set to detect the duplicates? How about this: def _uniq(items): newitems = [] seen = set() for item in items: if item not in seen: newitems.append(item) seen.add(item) return newitems -- ___ Python tracker <https://bugs.python.org/issue37723> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37687] Invalid regexp should rise exception
Matthew Barnett added the comment: For historical reasons, if it isn't valid as a repeat then it's a literal. This is true in other regex implementations, and is by no means unique to the re module. -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue37687> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37327] python re bug
Matthew Barnett added the comment: The problem is the "(?:[^<]+|<(?!/head>))*?". If I simplify it a little I get "(?:[^<]+)*?", which is a repeat within a repeat. There are many ways in which it could match, and if what follows fails to match (it doesn't because there's no "
[issue36468] Treeview: wrong color change
Matthew Barnett added the comment:
I've just come across the same problem.
For future reference, adding the following code before using a Treeview widget
will fix the problem:
def fixed_map(option):
# Fix for setting text colour for Tkinter 8.6.9
# From: https://core.tcl.tk/tk/info/509cafafae
#
# Returns the style map for 'option' with any styles starting with
# ('!disabled', '!selected', ...) filtered out.
# style.map() returns an empty list for missing options, so this
# should be future-safe.
return [elm for elm in style.map('Treeview', query_opt=option) if
elm[:2] != ('!disabled', '!selected')]
style = ttk.Style()
style.map('Treeview', foreground=fixed_map('foreground'),
background=fixed_map('background'))
--
nosy: +mrabarnett
___
Python tracker
<https://bugs.python.org/issue36468>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36653] Dictionary Key is without ' ' quotes
Matthew Barnett added the comment: That should be: def __repr__(self): return repr(self.name) Not a bug. -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue36653> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue32308] Replace empty matches adjacent to a previous non-empty match in re.sub()
Matthew Barnett added the comment:
Consider re.findall(r'.{0,2}', 'abcde').
It finds 'ab', then continues where it left off to find 'cd', then 'e'.
It can also find ''; re.match(r'.*', '') does match, after all.
It could, in fact, an infinite number of ''.
And what about re.match(r'()*', '')?
What should it do? Run forever? Raise an exception?
At some point you have to make a decision as to what should happen, and the
general consensus has been to match once.
--
___
Python tracker
<https://bugs.python.org/issue32308>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue32308] Replace empty matches adjacent to a previous non-empty match in re.sub()
Matthew Barnett added the comment: It's now consistent with Perl, PCRE and .Net (C#), as well as re.split(), re.sub(), re.findall() and re.finditer(). -- ___ Python tracker <https://bugs.python.org/issue32308> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36397] re.split() incorrectly splitting on zero-width pattern
Matthew Barnett added the comment: The list alternates between substrings (s, between the splits) and captures (c): ['1', '1', '2', '2', '11'] -s- -c- -s- -c- -s-- You can use slicing to extract the substrings: >>> re.split(r'(?<=(\d))(?!\1)(?=\d)', '12111')[ : : 2] ['1', '2', '111'] -- ___ Python tracker <https://bugs.python.org/issue36397> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36397] re.split() incorrectly splitting on zero-width pattern
Matthew Barnett added the comment: >From the docs: """If capturing parentheses are used in pattern, then the text of all groups in the pattern are also returned as part of the resulting list.""" The pattern does contain a capture, so that's why the result has additional '1' and '2'. Presumably, Java's split doesn't do that. Not a bug. -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue36397> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35155] Clarify Protocol Handlers in urllib.request Docs
Matthew Barnett added the comment: You could italicise the "protocol" part using asterisks, like this: *protocol*_request or this: *protocol*\ _request depending on the implementation of the rst software. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue35155> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35859] Capture behavior depends on the order of an alternation
Matthew Barnett added the comment:
It matches, and the span is (0, 2).
The only way that it can match like that is for the capture group to match the
'a', and the final 'b' to match the 'b'.
Therefore, re.search(r'(ab|a)*b', 'ab').groups() should be ('a', ), as it is
for the pattern with a greedy repeat.
--
___
Python tracker
<https://bugs.python.org/issue35859>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35859] Capture behavior depends on the order of an alternation
Matthew Barnett added the comment: It looks like a bug in re to me. -- ___ Python tracker <https://bugs.python.org/issue35859> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35653] All regular expression match groups are the empty string
Matthew Barnett added the comment:
Look at the spans of the groups:
>>> import re
>>> re.search(r'^(?:(\d*)(\D*))*$', "42AZ").span(1)
(4, 4)
>>> re.search(r'^(?:(\d*)(\D*))*$', "42AZ").span(2)
(4, 4)
They're telling you that the groups are matching twice (because of the outer
*). The first time, they match ('42', 'AZ'); the second time, they match ('',
'') at the end of the string.
Not a bug.
--
resolution: -> not a bug
stage: -> resolved
status: open -> closed
___
Python tracker
<https://bugs.python.org/issue35653>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35645] Alarm usage
Matthew Barnett added the comment:
@Steven: The complaint is that the BEL character ('\a') doesn't result in a
beep when printed.
@Siva: These days, you shouldn't be relying on '\a' because it's not always
supported. If you want to make a beep, do so with the appropriate function
call. Ask Google!
--
___
Python tracker
<https://bugs.python.org/issue35645>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35546] String formatting produces incorrect result with left-aligned zero-padded format
Matthew Barnett added the comment: A similar issue exists with centring: >>> format(42, '^020') '0420' -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue35546> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35538] splitext does not seems to handle filepath ending in .
Matthew Barnett added the comment:
It always returns the dot.
For example:
>>> posixpath.splitext('.blah.txt')
('.blah', '.txt')
If there's no extension (no dot):
>>> posixpath.splitext('blah')
('blah', '')
Not a bug.
--
nosy: +mrabarnett
resolution: -> not a bug
stage: -> resolved
status: open -> closed
___
Python tracker
<https://bugs.python.org/issue35538>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35072] re.sub does not play nice with chr(92)
Matthew Barnett added the comment: @Ezio: the value of stringy_thingy is irrelevant because it never gets that far; it fails when it tries to parse the replacement, which occurs before attempting any matching. I can't reproduce the difference either. -- status: pending -> open ___ Python tracker <https://bugs.python.org/issue35072> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34694] Dismiss To Avoid Slave/Master wording cause it easier for non English spoken programmers
Change by Matthew Barnett : -- nosy: -mrabarnett ___ Python tracker <https://bugs.python.org/issue34694> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34763] Python lacks 0x4E17
Change by Matthew Barnett : -- Removed message: https://bugs.python.org/msg326012 ___ Python tracker <https://bugs.python.org/issue34763> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34763] Python lacks 0x4E17
Change by Matthew Barnett : -- Removed message: https://bugs.python.org/msg326014 ___ Python tracker <https://bugs.python.org/issue34763> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34763] Python lacks 0x4E17
Change by Matthew Barnett : -- Removed message: https://bugs.python.org/msg326013 ___ Python tracker <https://bugs.python.org/issue34763> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34763] Python lacks 0x4E17
Change by Matthew Barnett : -- Removed message: https://bugs.python.org/msg326015 ___ Python tracker <https://bugs.python.org/issue34763> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34763] Python lacks 0x4E17
Matthew Barnett added the comment: Unicode 11.0.0 has 卅 (U+5345) as being numeric and having the value 30. What's the difference between that and U+4E17? I notice that they look at lot alike. Are they different variants, perhaps traditional vs simplified? -- ___ Python tracker <https://bugs.python.org/issue34763> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34738] Distutils: ZIP files don't include directory entries
Matthew Barnett added the comment: I don't see a problem with this. If the zip file has 'dist/file1.py' then you know to create a directory when unzipping. If you want to indicate that there's an empty directory 'foo', then put 'foo/' in the zip file. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue34738> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34605] Avoid master/slave terminology
Matthew Barnett added the comment: Not all uses of the word "master" are associated with slavery, e.g. "master craftsman", "master copy", "master file table". I think it's best to avoid use of master/slave where practicable, but other uses of "master" are not necessarily a problem. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue34605> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue33785] Crash caused by pasting ̖̈ into python
Matthew Barnett added the comment: For clarity, the first is '\U00010308\U00010316' and the second is '\U00010306\U00010300\U0001030B'. The BMP is the Basic Multilingual Plane, which covers the codepoints in the range U+ to U+. Some software has a problem dealing with codepoints outside the BMP. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue33785> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue33721] os.path.exists() ought to return False if pathname contains NUL
Matthew Barnett added the comment: It also raises a ValueError on Windows. For other invalid paths on Windows it returns False. -- nosy: +mrabarnett ___ Python tracker <https://bugs.python.org/issue33721> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue33566] re.findall() dead locked whent the expected ending char not occur until end of string
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: You don't give the value of 'newlines', but the problem is probably catastrophic backtracking, not deadlock. -- nosy: +mrabarnett ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33566> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue32982] Parse out invisible Unicode characters?
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:
For the record, '\u200e' is '\N{LEFT-TO-RIGHT MARK}'.
--
nosy: +mrabarnett
___
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32982>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue25054] Capturing start of line '^'
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: findall() and finditer() consist of multiple uses of search(), basically, as do sub() and split(), so we want the same rule to apply to them all. -- ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue25054> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue25054] Capturing start of line '^'
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: The pattern: \b|:+ will match a word boundary (zero-width) before colons, so if there's a word followed by colons, finditer will find the boundary and then the colons. You _can_ get a zero-width match (ZWM) joined to the start of a nonzero-width match (NWM). That's not really surprising. If you wanted to avoid a ZWM joined to either end of a NWM, you'd need to keep looking for another match at a position even after you'd already found a match if what you'd found was zero-width. That would also affect re.search and re.match. For regex on Python 3.7, I'm going with avoiding a ZWM joined to the end of a NWM, unless re's going a different way, in which case I have more work to do to remain compatible! The change I did for Python 3.7+ was trivial. -- ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue25054> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31969] re.groups() is not checking the arguments
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: @Narendra: The argument, if provided, is merely a default. Checking whether it _could_ be used would not be straightforward, and raising an exception if it would never be used would have little, if any, benefit. It's not a bug, and it's not worth changing. -- status: open -> closed ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31969> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31856] Unexpected behavior of re module when VERBOSE flag is set
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: Your verbose examples put the pattern into raw triple-quoted strings, which is OK, but their first character is a backslash, which makes the next character (a newline) an escaped literal whitespace character. Escaped whitespace is significant in a verbose pattern. -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31856> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31803] Remove not portable time.clock(), replaced by time.perf_counter() and time.process_time()
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: @Victor: True, people often ignore DeprecationWarning anyway, but that's their problem, at least you can say "well, you were warned". They might not have read the documentation on it recently because they have not felt the need to read again about a function with which they are already familiar. -- nosy: +mrabarnett ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31803> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31759] re wont recover nor fail on runaway regular expression
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: @Tim: the regex module includes some extra checks to reduce the chance of excessive backtracking. In the case of the OP's example, they seem to be working. However, it's difficult to know when adding such checks will help, and your example is one case where they are being done but aren't helping, with the result that it's slower. -- ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31759> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31759] re wont recover nor fail on runaway regular expression
Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment: You shouldn't assume that just because it takes a long time on one implementation that it'll take a long time on all of the others, because it's sometimes possible to include additional checks to reduce the problem. (I doubt you could eliminate the problem entirely, however.) My regex module, for example, includes some additional checks, and it seems to be OK with these tests. -- ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31759> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31193] re.IGNORECASE strips combining character from lower case of LATIN CAPITAL LETTER I WITH DOT ABOVE
Matthew Barnett added the comment:
The re module works with codepoints, it doesn't understand canonical
equivalence.
For example, it doesn't recognise that "\N{LATIN CAPITAL LETTER E}\N{COMBINING
ACUTE ACCENT}" is equivalent to "\N{LATIN CAPITAL LETTER E WITH ACUTE}".
This is true for Python in general, except for identifiers, which are
normalised:
>>> "\N{LATIN CAPITAL LETTER E}\N{COMBINING ACUTE ACCENT}"
'É'
>>> É = 0
>>> "\N{LATIN CAPITAL LETTER E WITH ACUTE}"
'É'
>>> É
0
This also means that, say '.' will match only 1 _codepoint_.
--
nosy: +mrabarnett
___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31193>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30802] datetime.datetime.strptime('200722', '%Y%U')
Matthew Barnett added the comment: I think the relevant standard is ISO 8601: https://en.wikipedia.org/wiki/ISO_8601 The first day of the week is Monday. Note particularly the examples it gives: Monday 29 December 2008 is written "2009-W01-1" Sunday 3 January 2010 is written "2009-W53-7" So the first few days of January can be in the last week of the previous year! -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30802> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30973] Regular expression "hangs" interpreter
Matthew Barnett added the comment: The regex module is much better in this respect, but it's not foolproof. With this particular example it completes quickly. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30973> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30927] re.sub() does not work correctly on '.' pattern and \n
Matthew Barnett added the comment: The 4th parameter is the count, not the flags: sub(pattern, repl, string, count=0, flags=0) >>> re.sub(r'X.', '+', '-X\n-', flags=re.DOTALL) '-+-' -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30927> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30838] re \w does not match some valid Unicode characters
Matthew Barnett added the comment:
Python identifiers match the regex:
[_\p{XID_Start}]\p{XID_Continue}*
The standard re module doesn't support \p{...}, but the third-party "regex"
module does.
--
___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30838>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30838] re \w does not match some valid Unicode characters
Matthew Barnett added the comment: In Unicode 9.0.0, U+1885 and U+1886 changed from being General_Category=Other_Letter (Lo) to General_Category=Nonspacing_Mark (Mn). U+2118 is General_Category=Math_Symbol (Sm) and U+212E is General_Category=Other_Symbol (So). \w doesn't include Mn, Sm or So. The .identifier method uses the Unicode properties XID_Start and XID_Continue, which include these codepoints. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30838> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30802] datetime.datetime.strptime('200722', '%Y%U')
Matthew Barnett added the comment: Expected result is datetime.datetime(2017, 6, 25, 0, 0). -- nosy: +mrabarnett ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30802> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30772] If I make an attribute "[a unicode version of B]", it gets assigned to "[ascii B]", and so on.
Matthew Barnett added the comment:
See PEP 3131 -- Supporting Non-ASCII Identifiers
It says: """All identifiers are converted into the normal form NFKC while
parsing; comparison of identifiers is based on NFKC."""
>>> import unicodedata
>>> unicodedata.name(unicodedata.normalize('NFKC', '\N{MATHEMATICAL
>>> DOUBLE-STRUCK CAPITAL B}'))
'LATIN CAPITAL LETTER B'
--
nosy: +mrabarnett
___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30772>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30736] Support Unicode 10.0
Matthew Barnett added the comment: @Steven: Python 3.6 supports Unicode 9. Python 3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 18:41:36) [MSC v.1900 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import unicodedata >>> unicodedata.unidata_version '9.0.0' -- nosy: +mrabarnett ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30736> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30209] some UTF8 symbols
Matthew Barnett added the comment: IDLE uses tkinter, which wraps tcl/tk. Versions up to tcl/tk 8.6 can't handle 'astral' codepoints. See also: Issue #30019: IDLE freezes when opening a file with astral characters Issue #21084: IDLE can't deal with characters above the range (U+-U+) -- nosy: +mrabarnett ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30209> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30157] csv.Sniffer.sniff() regex error
Matthew Barnett added the comment: There are 4 patterns. They try to determine the delimiter and quote by looking for matches. Each pattern supposedly covers one of 4 cases: 1. Delimiter, quote, value, quote, delimiter. 2. Start of line/text, quote, value, quote, delimiter. 3. Delimiter, quote, value, quote, end of line/text. 4. Start of line/text, quote, value, quote, end of line/text. On that basis, case 3 looks wrong because the pattern for delimiter is: >[^\w\n"\'] instead of the expected: [^\w\n"\'] Looks like a bug to me. -- nosy: +mrabarnett ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30157> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30148] Pathological regex behaviour
Matthew Barnett added the comment: If 'ignores' is '', you get this: (?:\b(?:extern|G_INLINE_FUNC|%s)\s*) which can match an empty string, and it's tried repeatedly. That's inadvisable. There's also: (?:\s+|\*)+ which can match whitespace in multiple ways. That's inadvisable too. If the pattern really doesn't match the string (and it doesn't!), then it won't find out until it has tried _all_ of the possibilities. Some implementations, such as Perl's, have extra checks to try to reduce the problem. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30148> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30133] Strings that end with properly escaped backslashes cause error to be thrown in re.search/sub/etc. functions.
Matthew Barnett added the comment: The function solution does have a larger overhead than a literal. Could the template be made more accepting of backslashes without breaking anything? (There's also issue29995 "re.escape() escapes too much", which might help.) -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30133> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30133] Strings that end with properly escaped backslashes cause error to be thrown in re.search/sub/etc. functions.
Matthew Barnett added the comment:
Yes, the second argument is a replacement template, not a literal.
This issue does point out a different problem, though: re.escape will add
backslashes that will then be treated as literals in the template, for example:
>>> re.sub(r'a', re.escape('(A)'), 'a')
'\\(A\\)'
re.escape doesn't always help.
The solution here is to pass a replacement function instead:
>>> re.sub(r'a', lambda m: '(A)', 'a')
'(A)'
--
___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30133>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29977] re.sub stalls forever on an unmatched non-greedy case
Matthew Barnett added the comment: A slightly shorter form: /\*(?:(?!\*/).)*\*/ Basically it's: match start while not match end: consume character match end If the "match end" is a single character, you can use a negated character set, for example: [^\n]* otherwise you need a negative lookahead, for example: (?:(?!\r\n).)* -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29977> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17441] Do not cache re.compile
Matthew Barnett added the comment: If we were doing it today, maybe we wouldn't cache them, but, as you say, it's been like that for a long time. (The regex module also caches them, because the re module does.) Unless someone can demonstrate that it's a problem, I'd say just leave it as it is. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17441> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29571] test_re is failing when local is set for `en_IN`
Matthew Barnett added the comment: The report says "== encodings: locale=UTF-8, FS=utf-8". It says that "test_locale_caching" was skipped, but also that "test_locale_flag" failed. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29571> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29571] test_re is failing when local is set for `en_IN`
Matthew Barnett added the comment: I'm just wondering whether the problem is just due to the locale's encoding being UTF-8. The locale support in re really only works with encodings that use 1 byte/character. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29571> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22594] Add a link to the regex module in re documentation
Matthew Barnett added the comment: Ah, well, if it hasn't changed after this many years, it never will. Expect one or two changes to the text. :-) -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22594> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22594] Add a link to the regex module in re documentation
Matthew Barnett added the comment: With the VERSION0 flag (the default behaviour), it should behave the same as the re module, and that's not going to change. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22594> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22594] Add a link to the regex module in re documentation
Matthew Barnett added the comment: I agree with Marco that it shouldn't be too verbose. I'd like to suggest that it says that it's compatible (i.e. has the same API), but with additional features. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22594> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
