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      1. return 语句的目的是什么?它与印刷有何不同?

        时间:2023-09-02
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                  本文介绍了return 语句的目的是什么?它与印刷有何不同?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  什么是return语句的简单基本解释,在Python中如何使用?

                  What is the simple basic explanation of what the return statement is, how to use it in Python?

                  它和print语句有什么区别?

                  推荐答案

                  print() 函数在控制台中写入,即打印"一个字符串.return 语句使你的函数退出并将一个值返回给它的调用者.一般来说,函数的重点是接受输入并返回一些东西.return 语句在函数准备好向其调用者返回值时使用.

                  The print() function writes, i.e., "prints", a string in the console. The return statement causes your function to exit and hand back a value to its caller. The point of functions in general is to take in inputs and return something. The return statement is used when a function is ready to return a value to its caller.

                  例如,这是一个同时使用 print()return 的函数:

                  For example, here's a function utilizing both print() and return:

                  def foo():
                      print("hello from inside of foo")
                      return 1
                  

                  现在您可以运行调用 foo 的代码,如下所示:

                  Now you can run code that calls foo, like so:

                  if __name__ == '__main__':
                      print("going to call foo")
                      x = foo()
                      print("called foo")
                      print("foo returned " + str(x))
                  

                  如果您将其作为脚本(例如 .py 文件)而不是在 Python 解释器中运行,您将获得以下输出:

                  If you run this as a script (e.g. a .py file) as opposed to in the Python interpreter, you will get the following output:

                  going to call foo
                  hello from inside foo
                  called foo   
                  foo returned 1
                  

                  我希望这会让它更清楚.解释器将返回值写入控制台,这样我就能明白为什么有人会感到困惑.

                  I hope this makes it clearer. The interpreter writes return values to the console so I can see why somebody could be confused.

                  下面是来自解释器的另一个例子,它证明了这一点:

                  Here's another example from the interpreter that demonstrates that:

                  >>> def foo():
                  ...     print("hello from within foo")
                  ...     return 1
                  ...
                  >>> foo()
                  hello from within foo
                  1
                  >>> def bar():
                  ...   return 10 * foo()
                  ...
                  >>> bar()
                  hello from within foo
                  10
                  

                  可以看到,当 bar() 调用 foo() 时,1 并没有写入控制台.相反,它用于计算从 bar() 返回的值.

                  You can see that when foo() is called from bar(), 1 isn't written to the console. Instead it is used to calculate the value returned from bar().

                  print() 是一个会导致副作用的函数(它在控制台中写入一个字符串),但会从下一条语句继续执行.return 使函数停止执行并将值返回给调用它的任何对象.

                  print() is a function that causes a side effect (it writes a string in the console), but execution resumes with the next statement. return causes the function to stop executing and hand a value back to whatever called it.

                  这篇关于return 语句的目的是什么?它与印刷有何不同?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

                  上一篇:为什么“返回 list.sort()"?返回无,而不是列表? 下一篇:return,return None,根本不返回?

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