Writing to a file

[Dan Stromberg]

with closes the file for you, when the indented block is exited.

~ isn't cross-platform at all, in fact it's not precisely python, though
os.path.expanduser understands it.

AFAIK, the jury's still out on whether the /'s in pathnames as directory
separators are portable.  I know they work on *ix and Windows (in API's
since DOS 2.0 when a directory hierarchy was introduced), but what about
Python on MacOS 9, VMS, RiscOS, etcetera?  I heard years ago on
comp.lang.python that Python (not just the underlying OS, as above, but
Python too) would treat / as a directory separator irrespective of what the
underlying OS thought of it, but I'm having difficulty finding more than
tangential references to this idea now.

On Fri, Mar 25, 2011 at 6:39 PM, Littlefield, Tyler <tyler at tysdomain.com>wrote:

> >    with open(test_absname, 'w') as test:
> what's the difference in that and test = ...? I can see why you mentioned
> the os.path for cross-platform, but I don't understand why someone would use
> with over =.
>
> On 3/25/2011 7:11 PM, eryksun () wrote:
>
>> On Friday, March 25, 2011 11:07:19 AM UTC-4, jyou... at kc.rr.com wrote:
>>
>>> f = open('~/Desktop/test.txt', 'w')
>>>>>> f.write('testing 1... 2... 3...')
>>>>>> f.close()
>>>>>>
>>>>> Consider using "with" to automatically close the file and os.path for
>> cross-platform compatibility:
>>
>>     import os.path
>>     user_home = os.path.expanduser('~')
>>     test_absname = os.path.join(user_home, 'Desktop', 'test.txt')
>>
>>     with open(test_absname, 'w') as test:
>>         test.write('testing 1... 2... 3...')
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20110325/cf0452b6/attachment-0001.html>