Standard Streams

The standard streams (stdin, stdout and stderr) are data objects, which are automatically opened:

>>> import sys

>>> for i in (sys.stdin, sys.stdout, sys.stderr):

... print(i)

...

<_io.TextIOWrapper name='<stdin>' mode='r' encoding='UTF-8'>

<_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>

<_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>

>>>