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contextlib.redirect_stdout in Python

A context manager that temporarily directs stdout to the specified file-like object.

contextlib.redirect_stdout (target)

target - The target, a file-like object where stdout should be redirected. 


Will redirect sys.stdout to file-like object .
May be useful for use with third-party code that uses only stdout .

Note

From- because of the "global" nature of sys.stdout , you should not use this manager in library code and in the vast majority of threaded programs. Also, it doesn’t work with subprocess output (see subprocess ). 


The example below help () uses sys.stdout , but with of the manager in question, you can redirect the output to io.StringIO , to a file on disk, or to sys.stderr :

  # Into the line help_output. 
out = io.StringIO ()
with redirect_stdout (out):
help (pow)
help_output = out.getvalue ()

# To a file on disk.
with open (’help.txt’,’ w’) as help_file:
with redirect_stdout (help_file):
help (pow)

# To stderr .
with redirect_stdout (sys.stderr):
help (pow)

Notes

The created object manager is reentrant . This means that within a single with block that has the same nested blocks, it can be used multiple times.

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