arious applications/systems?
> (Python's import rules and restrictions, change control/version
> control)
I have a lib directory in my PYTHONPATH to dump 'em.
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gt; logfile.write()
>
> This becomes more ugly if multiple withs get nested.
You don't have to nest them. Check out contextlib.ExitStack.
ExitStack is designed to handle situations where you don't always
want to enter some context, or you are entering a large number of
them.
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xt:
> space=\n
>
> rightText = text-space
>
> print(rightText)
Your code resembles Python code, but it isn't close enough for me
to offer reasonable help.
You should figure out how to solve your problem *before* you
start to write code. A paper and pencil will be required
On 2019-01-15, Juris __ wrote:
> Hi!
>
> On 15/01/2019 17:04, Neil Cerutti wrote:
>> On 2019-01-11, shibashib...@gmail.com wrote:
>>> Hello
>>>>
>>>> I'm very new in python. I have a file in the format:
>>>>
>>>> 201
8, 7, 5): # approximations
item = line[i:i+width]
record.append(item)
i += width
records.append(record)
This leaves them all strings, which in my experience is more
convenient in practice. You can convert as you go if you
want,though it won't look nice and simple any longer.
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will return True anyway.
Neat! I expected that a[0] would be executed in that case,
but it is not.
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On 2018-10-12, Peter J. Holzer wrote:
> Neil Cerutti said:
>> I imagine that if I stuck with Go long enough I'd develop a
>> new coding style that didn't inolve creating useful data
>> types.
>
> I haven't used Go for any real project yet (that may change
> next y
de,
but it still works and I can still maintain it with little
trouble.
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On 2018-10-10, Paul Rubin wrote:
> Neil Cerutti writes:
>> As Stephen said, it's sort of silly not to be aware of those
>> issues going in.
>
> If you're saying ESR messed up by using Python in the first
> place for that program, that's not a great advert for Python
&
around 300 lines, followed by
> several pages of reader comments.
>
> http://esr.ibiblio.org/?p=8161
Thanks for sharing it.
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roll in result):
> # - THIS LINE IS WHERE I NEED HELP # ( if 2, 3, 4, 6 in list: )
> print("you can roll again")
> else:
> print("you have all 1's and 5's in your result")
Ha! Didn't think I'd get to apply DeMorgan's Law so soon.
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uages to introduce new
names for things. You'd consider it wherever you'd consider
assigning something to a new name in Python. In this case, it was
probably just to avoid writing out that square root calculation
twice. Though you could use lambda calculus directly instead,
that might be considered
unfortunately it doesn't help
when an error occurs, requiring you to put it in a finally block
to ensure it happens.
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hing like this is possible. "x", "y" and "result" can be
unecessary.
for ply in range(5):
for com in range(5):
print(ply, com, end='')
if ply == com:
print(" Tie")
else:
print()
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ince you're already using the giant,
Swiss Army sledgehammer of the re module, go ahead and use enough
features to cover your use case.
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need look-ahead or similar inspection of more than the
current item. An alternative is a custom generator or iterator
that provides the window you need.
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red as a set I don't see how they can be
sorted. Are you converting to set and then calling difference?
It may still be more efficient than writing your own loop to take
advantage of the sorted status of the original objects.
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tes form "on high", we are simply required to
> follow them.
>
> IOWs, "Do as they _say_, not as logic dictates"
The Introduction to Computer Science class I'm taking divided
program design into two categories: Top Down Design, and Object
Oriented Design. It's good, becau
inary recommendation, but in 10+ years of using
> the csv module, I've not found any issues in using text/ascii mode
> that were solved by switching to using binary mode.
Binary mode was recommended for Python 2, but not 3, where you
open in text mode but use newline=''.
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root variable. Why?
>
> import numpy as np
>
> X=np.arange(1, 1, 1) #root variable
np.arange creates an object. The assignment makes X refer to that
object.
> x1=X
X refers to the previous object, and then the assignment makes x1
refer to that same object.
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On 2017-12-11, Neil Cerutti <ne...@norwich.edu> wrote:
> On 2017-12-05, Steve D'Aprano <steve+pyt...@pearwood.info> wrote:
>> On Wed, 6 Dec 2017 04:20 am, Jason wrote:
>>> while iterating over two files, which are line-by-line
>>> corresponding. The DictReade
action. When some records are missing--it sets them to
None. Except, when all the records are missing, it silently hides
the error with no ability provided to recover it.
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gt; fail because the substring is at the start of the line, since 'in' would
>> still be true no matter where the desired string is placed. It would be
>> useful to see some sample data of the old data, and the new data
>
> There is now also a line that starts with:
> PCH_CPU_TEMP:
>
> And I do not want that one.
You'll probably want to include the ':' in the startswith check, in case
someday they also add CPU_TEMP_SOMETHING:.
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t full of None, if
that's what's in the record? Haw many Nones are too many?
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gt; fail because the substring is at the start of the line, since 'in' would
>> still be true no matter where the desired string is placed. It would be
>> useful to see some sample data of the old data, and the new data
>
> There is now also a line that starts with:
> PCH_CPU_TEMP:
>
> And I do not want that one.
You'll probably want to include the ':' in the startswith check,
in case someday they also add CPU_TEMP_SOMETHING:.
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import__
> is just so much better!
You can import wherever you like--only good style requires you to
put them at the top of your file.
Moreover, snippets could be a library, with each snippet a
function, with the import inside the function. That would keep
the module name out of your global namespace.
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On 2017-10-31, Stefan Ram <r...@zedat.fu-berlin.de> wrote:
> Neil Cerutti <ne...@norwich.edu> writes:
>>You can use the % operator instead of +, and a generator
>>expression instead of map. It's a pretty small improvement,
>>though.
>
> "Improvement
value_list))
At least... I THINK you can use that generator expression in 2.7.
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t; take up 7 bytes in ZSCII as well.
>>
>> http://inform-fiction.org/zmachine/standards/z1point0/sect03.html
>
> not sure how 16 characters can be represented by either ascii
> or zscii in only 8 bytes
Oops! I hastily counted completely wrong. It's 10 bytes in ZSCII
versio
nt compress random
>> data. his compression is simply removing redundant space from
>> an inefficient coding
>
> I suspect he is using ASCII and storing one value in each byte.
There's also ZSCII, which stores roughly 3 characters every 2
bytes. Since all the digits are in A2, this sequence would take
up 7 bytes in ZSCII as well.
http://inform-fiction.org/zmachine/standards/z1point0/sect03.html
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On 2017-10-13, Steve D'Aprano <steve+pyt...@pearwood.info> wrote:
> On Fri, 13 Oct 2017 11:54 pm, Gregory Ewing wrote:
>
>> Neil Cerutti wrote:
>>> I can tell at a glance if a parameter is expected to be
>>> modifiable just by looking at the function signature
gt;> If not, you couldn't pass a string literal to a function
>> having prototype void f(char *s);
>
> That *ought* to be prevented. That's the whole point.
I'm far less experienced in C, but I threw up my hands and
stopped bothering with const qualifiers in C due to such
headac
On 2017-10-11, Gregory Ewing <greg.ew...@canterbury.ac.nz> wrote:
> Neil Cerutti wrote:
>> I dig const qualifiers, even though I'm comletely fine with
>> their absence from Python.
>
> Out of curiosity, do you have any insights into why you like
> them in C++, if you
ce from Python.
I'd use C++ for stuff--but Python is perfect for my needs,
meanwhile the advantages I'd get from using C++ wouldn't be
relevant to my work. If I ever need to write a device driver I'm
really screwed.
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an's way of thinking about and
asking questions about Python has been of great interest to me,
and provided entertainment and enlightenment.
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0-second job using a pivot table in Excel.
Office manager, learn thy Excel!
On the other hand, I think Python's csv module is a killer app,
so I do recommend taking the opportunity to learn csv.DictReader
and csv.DictWriter for your own enjoyment.
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ay to teach iterators.
If you insist they understand the iterator protocol and exception
handling first they're bound to think iteration is a hovercraft
full of eels.
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of them are good at explaining what they
know in a comprehensible and entertaining way. I believe you will
benefit from and even enjoy some of the literature. Here's a
recent favorite: "The Pragmatic Programmer", Andrew Hunt and
David Thomas. ISBN-13: 978-0201616224
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whiz-bang C programmer to configure your
email server--it isn't that he or she *can't* do it...
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ile spec, at least on one
side of the pipeline. Some experience in the industry you want to
script for will really be required, even in such simple cases.
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- 101 + 1) * (101 + 2033) / 2
You could also calculate it with a combination of sum and range
builtins, as others have hinted, and if it's homework that's
probably a good idea.
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ences of bytes. It provides separate
API's that allow you to regard those bytes as either plain old
bytes, or as a sequence of runes (not-necessarily normalized
codepoints). If your bytes strings aren't in UTF-8, then Go Away.
https://blog.golang.org/strings
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with a
generator in Python is going to feel awkward.
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arn concepts and illuminate dark corners
of both my own skill and Python's features.
An Excel spreadsheet that represents a table of data is fairly
simple to map onto a Python dict. One nearly codeless way is to
export it from Excel as a csv file and then read it with
csv.DictReader.
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at this point, after only one bad experience trying to
work around my choice of container.
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0, SQLite3
> 3.13.0) has no autocommit attribute at all. I checked at the
> module, connection and cursor levels.
You get autocommit with sqlite3 by setting isolation_level=None
on the connection object.
https://docs.python.org/2/library/sqlite3.html#sqlite3-controlling-transactions
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On 2017-06-02, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote:
>
> A bit of a long free-association rambling...
>
> On Fri, 2 Jun 2017 12:07:45 + (UTC), Neil Cerutti
> <ne...@norwich.edu> declaimed the following:
>>You're probably not expected
nsaction control
commands from different levels of abstraction, e.g., only call
'commit' directly if you called 'begin' directly.
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langauge that
concentrates on functional programming with immutable state if
you haven't done it before. The book that worked for me was
Simply Scheme https://people.eecs.berkeley.edu/~bh/ss-toc2.html,
but that's sorta ancient history now and I'm sure there's lots
more options out there.
On 2017-04-03, Jay Braun <lyngw...@gmail.com> wrote:
> I hear people say it like the plural of "panda", and others as
> "panduss". Is there a correct way?
I think it is pronounced like the regular word. The second a is
schwa in both the singular and plur
the column-names portion of an INSERT statement.
quoted_val, = c.execute("SELECT quote(?);", (val,)).fetchone()
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arser, but have the feeling that it is not really
>> used.
>
> I use it a lot ;-)
Me too. I wrote a script once to convert all my .cfg files to
JSON at one point while trying out a switch from Python to Go,
but never made the changeover.
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manageable that the ones I
used in Python ...
C could provide more friendly general purpose containers in its
library, but doesn't. There are some good free ones: glib, for
example.
Cython provides a really nice in-between level.
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.
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is a draw. Go's tools are pretty awesome, and are
scheduled for improvements.
If you can get by with its built in types (or simple aggregates
of them) it feels quite expressive.
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underestimated how much
we like to use our programming languages as non-RPN calculators.
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statement for an example of what it might
look like in Python. Except you'd get it without labeled break or
the fallthrough statement. Would you still want to use it?
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of
the called function.
Am I oversimplifying?
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to
that mind-bending experience.
http://www.eecs.berkeley.edu/~bh/ss-toc2.html
I wouldn't recommend trying to learn anything at the same time as
learning Haskell. ;)
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the beginning, but it's a pretty good place.
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. But good
point! That's a pretty sneaky way to avoid checking for a
zero-length string. Is it a popular idiom?
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] == '':
...
It is wrong to avoid the obvious. Needlessly ornate or clever
code will only irritate the person who has to read it later; most
likely yourself.
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easy to forget exactly why startswith and endswith even exist.
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, in inner
key[0] == '' and key[-1] == ''
IndexError: string index out of range
The corrected version
key and key[0] == '' and key[-1] == ''
probably still wins the Pretty Unimportant Olympics.
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, Windows, and Linux
computers for years:
disable the caps-lock key
I really liked rebinding it to Left-CTRL. I only stopped doing
that because it screwed up my work flow when not at a keyboard I
could remap.
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, insulted, or have his few controversial opinions
brought into other topics. Tim's post was responding to a
specific, well-presented criticism of Python's string
implementation. Left unchallenged, it might linger unhappily in
the air, like a symphony ended on a dominant 7th chord.
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('raw.csv', 'b')
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On 2014-02-06, Tim Chase python.l...@tim.thechases.com wrote:
On 2014-02-06 17:40, Mark Lawrence wrote:
On 06/02/2014 14:02, Neil Cerutti wrote:
You must open the file in binary mode, as that is what the csv
module expects in Python 2.7. newline handling can be enscrewed
if you forget
program's answer with.
2. A general idea of how to solve the problem.
It's often a mistake to start writing code. Eventually you'll be
able to go directly from problem to code more often, but it will
take practice.
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to print a timedelta without
the fractions of seconds. The most straight-forward is:
print td.replace(microseconds=0)
That would be nice.
In the meantime, this works for your use case:
td -= td % timedelta(seconds=1)
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are. Isn't
that right, Mr... Poopy-Pants?
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.
But maybe I'm just naive.
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, is
most likely to be detected. Well, that and submitting one of the
entrapment-purposed answers that are sometimes made availalbe
here and elsewhere.
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On 2014-01-22, wxjmfa...@gmail.com wxjmfa...@gmail.com wrote:
In fact, Python just becomes the last tool I (would)
recommend, especially for non-ascii users.
Have a care, jmf. People unfamiliar with your opinions might take
that seriously.
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, for example, when editing
text with gvim. But when I want to use them in Python I have to
contend with the re module. I've never become comfortable with
it.
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On 2014-01-20, Devin Jeanpierre jeanpierr...@gmail.com wrote:
On Mon, Jan 20, 2014 at 8:16 AM, Mark Lawrence
breamore...@yahoo.co.uk wrote:
On 20/01/2014 16:04, Neil Cerutti wrote:
I use regular expressions regularly, for example, when
editing text with gvim. But when I want to use them
with an actual file path.
# This is where I add to the data.
In your case you might not want to process unless the path also
looks like an xml file.
mine = Miner('myxmldir')
Hmmm... I might be doing too much in __init__. ;)
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a convenient place to
hang the functions.
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is no problem; in fact, it feels darn good.
And another thing: How many other languages have their very own
calling convention?
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member lookup for both structs and
pointers to structs.
The - syntax perhaps was needful in the days before function
prototypes.
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the equivalent written in C.
I can't think of a reference, but I to recall that
bugs-per-line-of-code is nearly constant; it is not language
dependent. So, unscientifically, the more work you can get done
in a line of code, then the fewer bugs you'll have per amount of
work done.
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Python makes it very easy to manipulate such a structure. It
isn't clear that you need more than that yet.
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in the long
run.
NAILS
Nails were verboten in my high school wood working class...
We used dowels and glue; chisels to carve dove-tails; etc.
...
You lucky BASTARD!
We had to build bookcases out of banana leaves held together with
our own spittle.
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, then possibly rewrite it once her first
few programs become horrifying years later.
I haven't found time to rewrite all of mine yet. I still have a
program I use almost every day with an __init__ that returns
invalid objects but helpfully sets self.valid to 0.
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On 2013-12-04, Piotr Dobrogost
p...@google-groups-2013.dobrogost.net wrote:
On Wednesday, December 4, 2013 10:41:49 PM UTC+1, Neil Cerutti
wrote:
not something to do commonly. Your proposed syntax leaves the
distinction between valid and invalid identifiers a problem
the programmer has
can see is it quickly returns zero when modulus
is one.
I'm not a skilled or experienced CPython source reader, though.
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easier than
emmigrating from a police state.
Moreover, I'll always feel that I deserve more than I actually
do deserve.
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.
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the
distinction between valid and invalid identifiers a problem the
programmer has to deal with. It doesn't unify access to
attributes the way the getattr and setattr do.
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. There are good
examples here: http://unicode.org/reports/tr15/
Thanks for this excellent post.
Agreed.
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:
print(x)
else:
SystemExit
The input and output is as wanted, but my answer keep rejected,
here is my source code http://txt.do/1smv
No, your program outputs nothing. That's bound to fail. ;)
How is your program supposed to work, in your own words?
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On 2013-12-03, geezl...@gmail.com geezl...@gmail.com wrote:
x = input()
Your first problem is that input() returns text only up the a
newline, and then stops.
So you are reading the initial number line, but never reading the
rest of the lines.
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portal is poor marketing.
I wish they'd never bought dejanews.
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On 2013-12-02, Roy Smith r...@panix.com wrote:
In article mailman.3461.1385989809.18130.python-l...@python.org,
Neil Cerutti ne...@norwich.edu wrote:
On 2013-11-28, Roy Smith r...@panix.com wrote:
In article RCJlu.5$rx5.0@fx05.am4,
Alister alister.w...@ntlworld.com wrote:
Perhaps
', 'N')
('L', 'E', 'Q', 'N')
For some reason I've got more 2-character combinations than you,
though.
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() as stack:
input = stack.enter_context(open(self.full_path, 'r'))
writer = csv.writer(stack.enter_context(open(self.output_csv)))
When working with a csv file I like how it removes the output
temporary file object variable, though if you needed it for some
reason you could keep it.
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(major=3, minor=3, micro=2, releaselevel='final', serial=0)
Node A Nest
Node B Nest A
Node C Nest A/B
Node D Nest A/B/C
Node E Nest A/B/C/D
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literature, The Wombles,
and a British TV show, Steptoe and Son, but the characters work
fine on their own.
But even so, I agree that a footnote is a good idea. And I haven't always
lived up to that ideal, myself.
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Larry Wilson itd...@gmail.com via python.org
10:39 PM (10 hours ago) wrote:
Wanting to parse out the the temperature value in the
w:current element, just after the guid element using
ElementTree or xml.sax.
Since you aren't building up a complex data structure, xml.sax
will be an OK choice.
.
with contextlib.ExitStack() as stack:
try:
f = gzip.open('blah.txt', 'rb')
except IOError:
f = open('blah.txt', 'rb')
stack.enter_context(f)
for line in f:
print(line)
--
Neil Cerutti
On Tue, Nov 19, 2013 at 8:56 PM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info
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