get_pipe_transport(fd) 
Return the transport for the communication pipe corresponding to the integer file descriptor fd:
- 
0: readable streaming transport of the standard input (stdin), orNoneif the subprocess was not created withstdin=PIPE - 
1: writable streaming transport of the standard output (stdout), orNoneif the subprocess was not created withstdout=PIPE - 
2: writable streaming transport of the standard error (stderr), orNoneif the subprocess was not created withstderr=PIPE - other fd: 
None 
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