1. 写在前面 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 ...
For example: Python >>> x = 3 >>> f"{x:=8}" ' 3' The := in this case does look like a walrus operator, but the effect is quite different. To interpret x:=8 inside the f-string, the expression is broken into three parts: x, :, and =8. Here, x is the value, : ...
the Python release that most of you are probably using right now. The operator:=is called the walrus operator since it characterizes the look of the walrus. See the colon as eyes and the equal sign as its tusks.
In the above example, we have used the statement myVar=(value:=1117) to create two variables myVar and value. Here, The expression (value:=1117) uses the walrus operator to define the variable value. It then returns the value outside the parenthesis as if the whole statement (value:=1117...
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": ...
You’ll learn more about this topic in the section The Walrus Operator and Assignment Expressions.Okay! That was a quick introduction to operators and expressions in Python. Now it’s time to dive deeper into the topic. To kick things off, you’ll start with the assignment operator and ...
The Walrus Operator (:=) is a new feature introduced in Python 3.8. It allows you to assign a value to a variable and return the value within a single expression. This is known as assignment expression Python Copy Code Run Code 1 2 3 4 5 numbers = [1, 2, 3, 4, 5] while (...
Python's walrus operator := allows you to assign a value to a variable within an expression, combining assignment and use in a single step.
原标题 | Three Ways to Use the Walrus Operator inPython 作者|Jonathan Hsu 翻译|人气呆毛选手 审校| 鸢尾、唐里 摄影师:Florin Kozma ,照片来源:Unsplash 随着Python 3.8的发布,赋值表达式运算符(也称为海象运算符)也发布了。 运算符使值的赋值可以传递到表达式中。这通常会使语句数减少一个。例如: ...
该循环使用Python 3.8 及更高版本中可用的walrus operator来根据提供的模板测试每一行。您可以查看编译模式以了解潜伏在新发现的解析功能背后的正则表达式: >>> references_pattern._expression '\\.\\. \\[#\\] (?P<reference>.+?)' 原始parse模式".. [#] {reference}"更易于读取和写入。