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Merged revisions 55328-55341 via svnmerge from

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svn+ssh://pythondev@svn.python.org/python/branches/p3yk

........
  r55329 | brett.cannon | 2007-05-14 16:36:56 -0700 (Mon, 14 May 2007) | 3 lines

  Implement the removal of tuple parameter unpacking (PEP 3113).
  Thanks, Tony Lownds for the patch.
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  r55331 | neal.norwitz | 2007-05-14 16:40:30 -0700 (Mon, 14 May 2007) | 1 line

  Update to use Python 3.0
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  r55332 | brett.cannon | 2007-05-14 16:47:18 -0700 (Mon, 14 May 2007) | 2 lines

  Mention PEP 3113.  And thanks to Tony Lownds for the PEP 3113 patch.
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  r55333 | neal.norwitz | 2007-05-14 16:57:06 -0700 (Mon, 14 May 2007) | 1 line

  Fix exception printing (no more exceptions module)
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  r55334 | neal.norwitz | 2007-05-14 17:11:10 -0700 (Mon, 14 May 2007) | 1 line

  Remove popen* functions from os
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  r55335 | neal.norwitz | 2007-05-14 18:03:38 -0700 (Mon, 14 May 2007) | 1 line

  Get rid of most of popen.  There are still some uses I need to cleanup.
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  r55336 | neal.norwitz | 2007-05-14 21:11:34 -0700 (Mon, 14 May 2007) | 1 line

  Remove a few more remnants of the compiler package
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  r55337 | neal.norwitz | 2007-05-14 22:28:27 -0700 (Mon, 14 May 2007) | 1 line

  Get test_[cx]pickle working on 64-bit platforms (avoid overflow int/long)
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This commit is contained in:
Guido van Rossum 2007-05-15 18:46:22 +00:00
parent 360e4b8fb1
commit 1bc535dc78
64 changed files with 1614 additions and 2842 deletions
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67
Doc/lib/libsubprocess.tex
View file

@ -15,8 +15,6 @@ and functions, such as:
\begin{verbatim}
os.system
os.spawn*
os.popen*
popen2.*
commands.*
\end{verbatim}
@ -335,68 +333,3 @@ pipe = os.popen(cmd, mode='w', bufsize)
==>
pipe = Popen(cmd, shell=True, bufsize=bufsize, stdin=PIPE).stdin
\end{verbatim}
\begin{verbatim}
(child_stdin, child_stdout) = os.popen2(cmd, mode, bufsize)
==>
p = Popen(cmd, shell=True, bufsize=bufsize,
stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdin, child_stdout) = (p.stdin, p.stdout)
\end{verbatim}
\begin{verbatim}
(child_stdin,
child_stdout,
child_stderr) = os.popen3(cmd, mode, bufsize)
==>
p = Popen(cmd, shell=True, bufsize=bufsize,
stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)
(child_stdin,
child_stdout,
child_stderr) = (p.stdin, p.stdout, p.stderr)
\end{verbatim}
\begin{verbatim}
(child_stdin, child_stdout_and_stderr) = os.popen4(cmd, mode, bufsize)
==>
p = Popen(cmd, shell=True, bufsize=bufsize,
stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)
(child_stdin, child_stdout_and_stderr) = (p.stdin, p.stdout)
\end{verbatim}
\subsubsection{Replacing popen2.*}
\note{If the cmd argument to popen2 functions is a string, the command
is executed through /bin/sh. If it is a list, the command is directly
executed.}
\begin{verbatim}
(child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
==>
p = Popen(["somestring"], shell=True, bufsize=bufsize,
stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdout, child_stdin) = (p.stdout, p.stdin)
\end{verbatim}
\begin{verbatim}
(child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize, mode)
==>
p = Popen(["mycmd", "myarg"], bufsize=bufsize,
stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdout, child_stdin) = (p.stdout, p.stdin)
\end{verbatim}
The popen2.Popen3 and popen2.Popen4 basically works as subprocess.Popen,
except that:
\begin{itemize}
\item subprocess.Popen raises an exception if the execution fails
\item the \var{capturestderr} argument is replaced with the \var{stderr}
argument.
\item stdin=PIPE and stdout=PIPE must be specified.
\item popen2 closes all file descriptors by default, but you have to
specify close_fds=True with subprocess.Popen.
\end{itemize}