Re: Get number of lines in file
[EMAIL PROTECTED] wrote:
> Thanks! I was trying len(cpn_version) and that didn't work.
What's your problem? You get a value that's one more than
you expected? You should use splitlines() instead of split('\n'),
or easier, use readlines() instead of read(). Of course, with
a modern python you can just iterate over the file, but note
the difference between split and splitlines when the last line
is complete and ends with a newline character:
>>> a = """dgdgsdfg
... sdfgsdfgsdfg
... sdfgsdfgsdfg
... sdfgsdfgsdfg
... """
>>> a
'dgdgsdfg\nsdfgsdfgsdfg\nsdfgsdfgsdfg\nsdfgsdfgsdfg\n'
>>> a.split('\n')
['dgdgsdfg', 'sdfgsdfgsdfg', 'sdfgsdfgsdfg', 'sdfgsdfgsdfg', '']
>>> a.splitlines()
['dgdgsdfg', 'sdfgsdfgsdfg', 'sdfgsdfgsdfg', 'sdfgsdfgsdfg']
>>>
If you're allergic to splitlines ;) you could do...
>>> a.rstrip().split('\n')
['dgdgsdfg', 'sdfgsdfgsdfg', 'sdfgsdfgsdfg', 'sdfgsdfgsdfg']
...but it depends how you want to view files that end with
several linefeeds in a row (or other whitespace for that
matter).
>>> a = dfgdfg
... dfgdfg
...
... dgfdfg
...
...
...
... """
>>> a.split('\n')
['"dfgdfg', 'dfgdfg', '', 'dgfdfg', '', '', '', '']
>>> a.splitlines()
['"dfgdfg', 'dfgdfg', '', 'dgfdfg', '', '', '']
>>> a.rstrip().split('\n')
['"dfgdfg', 'dfgdfg', '', 'dgfdfg']
In other words, the right solution depends on what behaviour
you want for such cases (if they might exist with your files).
Experimenting like this with the interpreter is a very
convenient way to get a grip on things in Python, and one of
the reasons that Python debugging is usually quicker than
debugging in other languages.
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Re: Get number of lines in file
Elliot Temple wrote:
>
> On May 27, 2005, at 12:17 PM, [EMAIL PROTECTED] wrote:
>
>> I have read in a file and need to get the number of lines.
>>
>> cpn_file = open('Central Part number list.txt')
>> cpn_version = cpn_file.read().split('\n')
>>
>> I want to know the number of elements in cpn_version.
>
> Could you use:
>
> count_lines = len(cpn_file.readlines())
Or if you're worried about reading all of cpn_file into memory at once,
you could try something like:
sum(1 for line in cpn_file)
or in Python 2.3:
sum([1 for line in cpn_file])
STeVe
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Re: Get number of lines in file
Thanks! I was trying len(cpn_version) and that didn't work. -- http://mail.python.org/mailman/listinfo/python-list
Re: Get number of lines in file
On May 27, 2005, at 12:17 PM, [EMAIL PROTECTED] wrote:
> I have read in a file and need to get the number of lines.
>
> cpn_file = open('Central Part number list.txt')
> cpn_version = cpn_file.read().split('\n')
>
> I want to know the number of elements in cpn_version.
Could you use:
count_lines = len(cpn_file.readlines())
-- Elliot Temple
http://www.curi.us/
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Get number of lines in file
I have read in a file and need to get the number of lines.
cpn_file = open('Central Part number list.txt')
cpn_version = cpn_file.read().split('\n')
I want to know the number of elements in cpn_version.
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