On 2006-12-14, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> johnny wrote:
>
>> Can someone tell me what is the reason "[0]" appears after
>> ".communicate()"
>>
>> For example:
>> last_line=subprocess.Popen([r"tail","-n 1", "x.txt"],
>> stdout=subprocess.PIPE).communicate()[0]
>
> as explained in the documentation, communication() returns two
> values, as a tuple. [0] is used to pick only the first one.
>
> see the Python tutorial for more on indexing and slicing.
I like using pattern matching in these simple cases:
last_line, _ = subprocess.Popen([r"tail","-n 1", "x.txt"],
stdout=subprocess.PIPE).communicate()
--
Neil Cerutti
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