657                  stdin=None, stdout=None, stderr=None,  argument
696         self.stdin = None
728          errread, errwrite) = self._get_handles(stdin, stdout, stderr)
753                 self.stdin = io.open(p2cwrite, 'wb', bufsize)
755                     self.stdin = io.TextIOWrapper(self.stdin, write_through=True,
778             for f in filter(None, (self.stdin, self.stdout, self.stderr)):
786                 if stdin == PIPE:
828             if self.stdin:
829                 self.stdin.close()
873                 self.stdin.write(input)
886             self.stdin.close()
920             [self.stdin, self.stdout, self.stderr].count(None) >= 2):
923             if self.stdin:
1013         def _get_handles(self, stdin, stdout, stderr):  argument
1017             if stdin is None and stdout is None and stderr is None:
1024             if stdin is None:
1030             elif stdin == PIPE:
1033             elif stdin == DEVNULL:
1035             elif isinstance(stdin, int):
1036                 p2cread = msvcrt.get_osfhandle(stdin)
1039                 p2cread = msvcrt.get_osfhandle(stdin.fileno())
1260             if self.stdin:
1329         def _get_handles(self, stdin, stdout, stderr):  argument
1337             if stdin is None:
1339             elif stdin == PIPE:
1341             elif stdin == DEVNULL:
1343             elif isinstance(stdin, int):
1344                 p2cread = stdin
1347                 p2cread = stdin.fileno()
1634             if self.stdin and not self._communication_started:
1638                     self.stdin.flush()
1643                         self.stdin.close()
1669                 if self.stdin and input:
1670                     selector.register(self.stdin, selectors.EVENT_WRITE)
1688                         if key.fileobj is self.stdin:
1734             if self.stdin and self._input is None:
1738                     self._input = self._input.encode(self.stdin.encoding,
1739                                                      self.stdin.errors)