Does subprocess.communicate() close stdin after writing input to it?

Question

While it would seem logical, the documentation does not explicitly state it:

Interact with process: Send data to stdin. Read data from stdout and stderr, until end-of-file is reached. Wait for process to terminate.

Answer 1

From looking at the source I think the answer is yes:

• when timeout is None, communicate() calls self._stdin_write(input)
  https://github.com/python/cpython/blob/master/Lib/subprocess.py#L826-L827

• otherwise _communicate() calls self._stdin_write(input)
  https://github.com/python/cpython/blob/master/Lib/subprocess.py#L1078-L1079

• in each case _stdin_write() calls self.stdin.close() after self.stdin.write(input)
  https://github.com/python/cpython/blob/master/Lib/subprocess.py#L793