Re: WHAT is [0] in subprocess.Popen(blah).communicate()[0]

2006-12-14 Thread Fredrik Lundh 
johnny wrote:

 Can someone tell me what is the reason [0] appears after
 .communicate()
 
 For example:
 last_line=subprocess.Popen([rtail,-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.

/F

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Re: WHAT is [0] in subprocess.Popen(blah).communicate()[0]

2006-12-14 Thread Neil Cerutti 
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([rtail,-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([rtail,-n 1, x.txt],
  stdout=subprocess.PIPE).communicate()

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Neil Cerutti
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Re: WHAT is [0] in subprocess.Popen(blah).communicate()[0]

2006-12-14 Thread Gabriel Genellina 

At Thursday 14/12/2006 15:30, Neil Cerutti wrote:


I like using pattern matching in these simple cases:

  last_line, _ = subprocess.Popen([rtail,-n 1, x.txt],
  stdout=subprocess.PIPE).communicate()


pattern matching???


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Gabriel Genellina
Softlab SRL 


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Re: WHAT is [0] in subprocess.Popen(blah).communicate()[0]

2006-12-14 Thread Fredrik Lundh 
Gabriel Genellina wrote:


 I like using pattern matching in these simple cases:

   last_line, _ = subprocess.Popen([rtail,-n 1, x.txt],
   stdout=subprocess.PIPE).communicate()
 
 pattern matching???

http://www.haskell.org/tutorial/patterns.html

(the syntax's called target lists in Python)

/F

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