为什么不能将python的print分配给变量? [英] Why can't I assign python's print to a variable?

问题描述

我正在学习编程，并且正在使用Python进行启动.在那儿，我看到我可以做这样的事情:

I'm learning to program and I am using Python to start. In there, I see that I can do something like this:

>>>> def myFunction(): return 1
>>>> test = myFunction
>>>> test()
1

但是，如果我尝试对print执行相同操作，则会失败:

However, if I try and do the same with print it fails:

>>>> test2 = print
File "<stdin>", line 1
  test2 = print
              ^
SyntaxError: invalid syntax

为什么print与我创建的函数不同?这是使用Python v2.7.5.

Why is print different than a function I create? This is using Python v2.7.5.

推荐答案

print是一个语句，而不是函数. 在Python 3中进行了更改，部分原因是允许您执行此类操作.在Python 2.7中，您可以通过在文件顶部执行from __future__ import print_function来获得打印功能，然后您就可以执行test = print.

print is a statement, not a function. This was changed in Python 3 partly to allow you to do things like this. In Python 2.7 you can get print as a function by doing from __future__ import print_function at the top of your file, and then you will indeed be able to do test = print.

请注意，使用print作为功能，您不能再执行print x，而必须执行print(x)(即，需要括号).

Note that with print as a function, you can no longer do print x but must do print(x) (i.e., parentheses are required).

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