Python handles standard output

There are two kinds of output, one is standard output, one is standard error output, the Python processing standard output uses sys.stdout, processing standard error output with Sys.stderr

In [2]: import sys in [3]: Sys.stdout.write ('HelloWorld')    # Standard output (looks consistent with print usage)Hello Worldin [4]: Sys.stderr.write ('Hello World '  ')    # standard error output Hello World

[email protected] ~]# cat1. PY #!/usr/bin/Pythonimport Syssys.stdout.write ('This is a stdout\n') Sys.stderr.write ('This is a stderr\n') [[email protected]~]# python1. py >/dev/NULL # results show only standard error output  This isa stderr[[email protected]~]# python1. py2>/dev/NULL # results show only standard output  This isA stdout

Python handles standard output