You can avoid the repetition using the walrus operator as in the code snippet below:Python >>> while (line := input("Type some text: ")) != "stop": ... print(line) ... Type some text: Python Python Type some text: Walrus Walrus Type some text: stop ...
1. For loop的执行顺序 参考:https://kelepython.readthedocs.io/zh/latest/c01/c01_10.html#for For loop是一个遍历命令,意味着要把一个序列里的所有元素都循环一遍。 Python执行for loop从第一行到最后一行,exp: for question in questions: print("---") print(question) for option in options[question...
比如我在Do other things这个注释后是可以用length变量的。 loop 不仅是if,循环的条件也可以用到walrus operator。比如下面这段代码 while True: cmd = input() if cmd == "exit": break print(f"Got input {cmd}") 用一个循环不断从用户读取命令。如果命令是exit就退出循环。如果是其它命令就打印出来。改...
导读:赋值表达式(assignment expression)是Python3.8新引入的语法,它会用到海象操作符(walrus operator)。这种写法可以解决某些持续已久的代码重复问题。a = b是一条普通的赋值语句,读作a equals b,而a := b则是赋值表达式,读作a walrus b。 这个符号为什么叫walrus呢?因为把:=顺时针旋转90°之后,冒号就是海象...
Without the walrus operator, we have to create two lines. Python walrus read input In the following example, we use the walrus operator in a while loop. read_words.py #!/usr/bin/python words = [] while (word := input("Enter word: ")) != "quit": ...
导读:赋值表达式(assignment expression)是Python 3.8新引入的语法,它会用到海象操作符(walrus operator)。这种写法可以解决某些持续已久的代码重复问题。a = b是一条普通的赋值语句,读作a equals b,而a := b则是赋值表达式,读作a walrus b。 这个符号为什么叫walrus呢?因为把:=顺时针旋转90°之后,冒号就是海...
Python 的每个新版本都会为语言添加新特性。对于 Python 3.8,最大的变化就是通过:=操作符,在表达式中间赋值变量提供了一种新语法,这个运算符俗称为海象运算符。本文将解释 Walrus Operator的差别、使用案例、将其与现有方法进行比较并权衡利弊。:) 【注意】本文所有 Walrus Operator 示例都需要 Python 3.8 或更高版本...
Walrus operator (assignment expressions) F-string syntax for debugging Positional-only arguments If you want to try out some of these new features, then you need to make sure you’re working in a Python 3.8 environment. Otherwise, you’ll get a SyntaxError. Python 3.8 also provides the new ...
赋值表达式(assignment expression)是Python 3.8新引入的语法,它会用到海象操作符(walrus operator)。这种写法可以解决某些持续已久的代码重复问题。a = b是一条普通的赋值语句,读作a equals b,而a := b则是赋值表达式,读作a walrus b。 a = b是一条普通的赋值语句,读作a equals b,而a := b则是赋值表...
A common use case for the walrus operator is to simplify code where a variable would normally need to be defined before being used, such as in some conditional statements. Consider the followingwhileloop: importrandom value=random.randint(1,20)whilevalue<18:print(value)value=random.randint(1,...