Python - 从函数输出? [英] Python - output from functions?

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问题描述

我有一个非常基本的问题。假设我调用一个函数,例如

  def foo():
x ='hello world'

如何获得函数返回x的方式,以便我可以将它用作另一个函数的输入或在程序的主体中使用变量?



当我使用return并在另一个函数中调用变量时,我得到一个NameError。

解决方案

  def foo():
x ='hello world'
return x#return'hello world'也会这样做
$ b foo()
print x#NameError - x没有在函数外定义

y = foo()
print y#这个工程

x = foo()
print x# ,这是一个完全不同的x,比
$ foo()

z = bar(x)#里面的#当然,现在你可以使用x,因为你想要

z = bar(foo())#但你不必


I have a very rudimentary question.

Assume I call a function, e.g.,

def foo():
    x = 'hello world'

How do I get the function to return x in such a way that I can use it as the input for another function or use the variable within the body of a program?

When I use return and call the variable within another functions I get a NameError.

解决方案

def foo():
    x = 'hello world'
    return x  # return 'hello world' would do, too

foo()
print x    # NameError - x is not defined outside the function

y = foo()
print y    # this works

x = foo()
print x    # this also works, and it's a completely different x than that inside
           # foo()

z = bar(x) # of course, now you can use x as you want

z = bar(foo()) # but you don't have to

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