输入中的 print 语句返回“none"

2022-01-31 00:00:00 python python-3.x input

问题描述

我正在开发一个小程序，我想使用:

I am working on a little program and I want to use:

ans = int(input(print(multi,'x',num,'=')))

这很好用，除了在打印 print 语句后它说 none 之外.喜欢:

This works well except for the fact that after it prints the print statement it says none. like:

49 x 7 = None

如果可能，如何删除无"?我也搜索了这个问题，但没有什么是关于在输入中返回 none 的.

How would on remove the "none" if possible? Also I did search this problem but nothing was about returning a none inside of an input.

解决方案

input 将 prompt 字符串作为参数，它会自动打印，但 print 返回 None；这是由 input 打印的.您的代码相当于:

input takes a prompt string as its argument, which it will print automatically, but print returns None; it is this that gets printed by input. Your code is equivalent to:

prompt = print(...) # prompt == None ans = int(input(prompt))

改为使用 str.format 构建提示并将其直接传递给 input:

ans = int(input('{0}x{1}='.format(multi, num)))

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