[issue42668] re.escape does not correctly escape newlines

[Martin Altmayer]

Martin Altmayer  added the comment:

Thanks for the explanation, I did not know re.VERBOSE. I still think the 
behavior is a bit confusing, but it's probably not worth the effort to change 
this.

--
type: behavior -> enhancement

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[issue42668] re.escape does not correctly escape newlines

[Martin Altmayer]

New submission from Martin Altmayer :

re.escape('\n') returns '\\\n', i.e. a string consisting of a backslash and a 
newline. I believe it should return '\\n', i.e. a backslash and an 'n'. If the 
escape-result still contains a verbatim newline, why escape this character at 
all?

Note that Python's regular expressions engine allows newlines, so 
re.match(re.escape('\n'), '\n') gives a match. Thus, while this looks like an 
undesired behavior, it is not functionally broken.

The same problem applies to some other characters: \t\r\v\f

--
components: Regular Expressions
files: test.py
messages: 383237
nosy: MartinAltmayer, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: re.escape does not correctly escape newlines
type: behavior
versions: Python 3.10, Python 3.7, Python 3.8, Python 3.9
Added file: https://bugs.python.org/file49689/test.py

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[issue33649] asyncio docs overhaul

[Martin Altmayer]

Change by Martin Altmayer :


--
nosy: +MartinAltmayer

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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Martin Altmayer]

Martin Altmayer  added the comment:

Added a small PR. Shall we update the doc? With this PR there is no reason 
anymore to disallow timeouts greater than one day in asyncio.

Greetings from the sprints @ Edinburgh!

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nosy: +MartinAltmayer

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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Martin Altmayer]

Change by Martin Altmayer :


--
keywords: +patch
pull_requests: +8048
stage:  -> patch review

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[issue26923] asyncio.gather drops cancellation

[Martin Altmayer]

Martin Altmayer added the comment:

I don't think this is a mere documentation problem: If a future cannot be 
cancelled because it is already done, cancel must return False.

As Johannes' example demonstrates, a wrong return value from cancel might lead 
to a cancelled task being continued as if nothing happened:  If Task.cancel 
receives a false positive from its _fut_waiter, it will not throw a 
CancelledError into the task (_must_cancel=True), but simply continue the task.

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[issue7429] PrettyPrinter cannot print dicts with unsortable keys

[Martin Altmayer]

New submission from Martin Altmayer martin.altma...@web.de:

In the following code I use a class for dictionary-keys that has a
__hash__-function but cannot be ordered and try to print that dictionary
with a PrettyPrinter.

import pprint
pp = pprint.PrettyPrinter()

# A class that supports hashing and comparison for equality but cannot
be ordered
class KeyClass:
def __init__(self,id):
self.id = id

def __eq__(self,other):
return self.id == other.id

def __ne__(self,other):
return self.id != other.id

def __hash__(self):
return self.id


dictionary = dict.fromkeys([KeyClass(i) for i in range(10)])
pp.pprint(dictionary)

The script crashes with the following errors:

Traceback (most recent call last):
  File /usr/local/lib/python3.1/pprint.py, line 272, in _safe_repr
items = sorted(items)
TypeError: unorderable types: KeyClass()  KeyClass()

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File bug.py, line 20, in module
pp.pprint(dictionary)
  File /usr/local/lib/python3.1/pprint.py, line 106, in pprint
self._format(object, self._stream, 0, 0, {}, 0)
  File /usr/local/lib/python3.1/pprint.py, line 129, in _format
rep = self._repr(object, context, level - 1)
  File /usr/local/lib/python3.1/pprint.py, line 216, in _repr
self._depth, level)
  File /usr/local/lib/python3.1/pprint.py, line 228, in format
return _safe_repr(object, context, maxlevels, level)
  File /usr/local/lib/python3.1/pprint.py, line 277, in _safe_repr
items = sorted(items, key=sortkey)
TypeError: unorderable types: KeyClass()  KeyClass()

--
components: None
messages: 95939
nosy: maranos
severity: normal
status: open
title: PrettyPrinter cannot print dicts with unsortable keys
versions: Python 3.1

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