print(input()+ input())如何在python中工作?没有变量分配? [英] How print(input() + input()) works in python ? Without variable assignment?

问题描述

a = input()
b = input()
print(a+b)

这可以写成 print(input()+ input())即可.它是如何工作的?输入被临时存储在哪里?

This can be written as print(input()+input()) and it works. How does it work? Where are the inputs are stored temporarily?

推荐答案

前提: input()只是一个常规函数，该函数会阻塞直到用户键入内容为止.完成后，数据被评估并返回.

Premise: input() is just a normal function that blocks until the user types something in. Once that is done, the data is evaluated and returned.

撇开这些内容，您的声明由以下几部分组成:

With that set aside, your statement is composed of several parts:

print(...)是一个函数调用，它打印括号内的表达式的结果.

print(...) is a function call that prints the result of the expression that is between its parentheses.

表达式为 input()+ input().由于 operator()的优先级高于 operator + ，因此将在求和之前对两个 input()调用进行求值.

The expression then is input() + input(). Since the operator() has a higher precedence than operator+, the two input() calls will be evaluated before the sum.

input()的结果是未命名的临时变量，仅在评估完整表达式之前存在， em>.一旦执行 + ，临时变量将有效丢失(并最终被垃圾回收).

The result of an input() is an unnamed temporary variable that exists only until the full expression is evaluated. Once the + is executed, the temporary variables are effectively lost (and will be garbage collected eventually).

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