Python-撤消标准输出重定向

Question

所以我知道

Redirecting stdout to "nothing" in python

您可以抑制打印语句。但是是否有可能稍后撤消该命令，以便在特定点之后，打印语句确实会再次打印？

例如，假设我想打印“b”而不是“a”。

我会这样做:

import os
f = open(os.devnull, 'w')
sys.stdout = f

print("a")

# SOME COMMAND

print("b")

有人能告诉我什么是“某些命令”吗？

Answer 1

原始sys.stdout总是保存在sys.__stdout__中:

sys.stdout = sys.__stdout__

但是，文档确实指出，首选显式保存原始 sys.stdout:

It can also be used to restore the actual files to known working file objects in case they have been overwritten with a broken object. However, the preferred way to do this is to explicitly save the previous stream before replacing it, and restore the saved object.