gh-110383: Remove references to removed popen[234] (GH-112783)

Signed-off-by: Bradley Reynolds <[email protected]>

Author: shenanigansd

Doc/faq/library.rst

@@ -541,84 +541,6 @@ Thus, to read *n* bytes from a pipe *p* created with :func:`os.popen`, you need
 use ``p.read(n)``.
 
 
-.. XXX update to use subprocess. See the :ref:`subprocess-replacements` section.
-
-   How do I run a subprocess with pipes connected to both input and output?
-   ------------------------------------------------------------------------
-
-   Use the :mod:`popen2` module.  For example::
-
-      import popen2
-      fromchild, tochild = popen2.popen2("command")
-      tochild.write("input\n")
-      tochild.flush()
-      output = fromchild.readline()
-
-   Warning: in general it is unwise to do this because you can easily cause a
-   deadlock where your process is blocked waiting for output from the child
-   while the child is blocked waiting for input from you.  This can be caused
-   by the parent expecting the child to output more text than it does or
-   by data being stuck in stdio buffers due to lack of flushing.
-   The Python parent can of course explicitly flush the data it sends to the
-   child before it reads any output, but if the child is a naive C program it
-   may have been written to never explicitly flush its output, even if it is
-   interactive, since flushing is normally automatic.
-
-   Note that a deadlock is also possible if you use :func:`popen3` to read
-   stdout and stderr. If one of the two is too large for the internal buffer
-   (increasing the buffer size does not help) and you ``read()`` the other one
-   first, there is a deadlock, too.
-
-   Note on a bug in popen2: unless your program calls ``wait()`` or
-   ``waitpid()``, finished child processes are never removed, and eventually
-   calls to popen2 will fail because of a limit on the number of child
-   processes.  Calling :func:`os.waitpid` with the :const:`os.WNOHANG` option can
-   prevent this; a good place to insert such a call would be before calling
-   ``popen2`` again.
-
-   In many cases, all you really need is to run some data through a command and
-   get the result back.  Unless the amount of data is very large, the easiest
-   way to do this is to write it to a temporary file and run the command with
-   that temporary file as input.  The standard module :mod:`tempfile` exports a
-   :func:`~tempfile.mktemp` function to generate unique temporary file names. ::
-
-      import tempfile
-      import os
-
-      class Popen3:
-          """
-          This is a deadlock-safe version of popen that returns
-          an object with errorlevel, out (a string) and err (a string).
-          (capturestderr may not work under windows.)
-          Example: print(Popen3('grep spam','\n\nhere spam\n\n').out)
-          """
-          def __init__(self,command,input=None,capturestderr=None):
-              outfile=tempfile.mktemp()
-              command="( %s ) > %s" % (command,outfile)
-              if input:
-                  infile=tempfile.mktemp()
-                  open(infile,"w").write(input)
-                  command=command+" <"+infile
-              if capturestderr:
-                  errfile=tempfile.mktemp()
-                  command=command+" 2>"+errfile
-              self.errorlevel=os.system(command) >> 8
-              self.out=open(outfile,"r").read()
-              os.remove(outfile)
-              if input:
-                  os.remove(infile)
-              if capturestderr:
-                  self.err=open(errfile,"r").read()
-                  os.remove(errfile)
-
-   Note that many interactive programs (e.g. vi) don't work well with pipes
-   substituted for standard input and output.  You will have to use pseudo ttys
-   ("ptys") instead of pipes. Or you can use a Python interface to Don Libes'
-   "expect" library.  A Python extension that interfaces to expect is called
-   "expy" and available from https://expectpy.sourceforge.net.  A pure Python
-   solution that works like expect is :pypi:`pexpect`.
-
-
 How do I access the serial (RS232) port?
 ----------------------------------------
 

Doc/library/subprocess.rst

@@ -1443,36 +1443,8 @@ Environment example::
 
 
 
-Replacing :func:`os.popen`, :func:`os.popen2`, :func:`os.popen3`
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-::
-
-   (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)
-
-::
-
-   (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)
-
-::
-
-   (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)
+Replacing :func:`os.popen`
+^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Return code handling translates as follows::
 
@@ -1489,44 +1461,6 @@ Return code handling translates as follows::
        print("There were some errors")
 
 
-Replacing functions from the :mod:`!popen2` module
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. 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.
-
-::
-
-   (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)
-
-::
-
-   (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)
-
-:class:`popen2.Popen3` and :class:`popen2.Popen4` basically work as
-:class:`subprocess.Popen`, except that:
-
-* :class:`Popen` raises an exception if the execution fails.
-
-* The *capturestderr* argument is replaced with the *stderr* argument.
-
-* ``stdin=PIPE`` and ``stdout=PIPE`` must be specified.
-
-* popen2 closes all file descriptors by default, but you have to specify
-  ``close_fds=True`` with :class:`Popen` to guarantee this behavior on
-  all platforms or past Python versions.
-
-
 Legacy Shell Invocation Functions
 ---------------------------------