Interact with process:

send data to stdin (if input is not None);

read data from stdout and stderr, until EOF is reached;

wait for process to terminate.

The optional input argument is the data (bytes object) that will be sent to the child process.

Return a tuple (stdout_data, stderr_data).

If either BrokenPipeError or ConnectionResetError exception is raised when writing input into stdin, the exception is ignored. This condition occurs when the process exits before all data are written into stdin.

If it is desired to send data to the process’ stdin, the process needs to be created with stdin=PIPE. Similarly, to get anything other than None in the result tuple, the process has to be created with stdout=PIPE and/or stderr=PIPE arguments.

Note, that the data read is buffered in memory, so do not use this method if the data size is large or unlimited.