第3 行: 使用海象运算符将值 True 赋给 walrus。 在上面的“walrus”变量中,我们可以看到两种赋值类型之间有一个微妙但重要的区别。海象运算符返回值,而传统赋值不返回值。在第 1 行的 “walrus = False” 之后,没有打印任何值,而在第 3 行的海象运算符表达式之后,则打印出了 True。 从这个例子中,我们可
The parentheses make the if statement both clearer and actually correct. There’s one final gotcha. When assigning a tuple using the walrus operator, you always need to use parentheses around the tuple. Compare the following assignments: Python >>> walrus = 3.7, False >>> walrus (3.7, Fal...
Python walrus operator tutorial shows how to use walrus operator in Python. Python 3.8 introduced a new walrus operator:=. The name of the operator comes from the fact that is resembles eyes and tusks of a walrus of its side. The walrus operator creates anassignment expression. The operator ...
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 ...
赋值表达式(Assignment Expressions)又称为"海象操作符"(the Walrus Operator)或"命名表达式"(Named Expressions), 是python3.8依赖提供的新功能。这功能褒贬不一,用的好的话事半功倍,用不好的话会成为代码坏味道的催化剂。本期视频通过实例演示,让大家认识赋值表达式的
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...
Python's walrus operator 03:42 Assignment isn't just about the equals sign 03:33 Mutating with an assignment statement 02:17 Augmented assignments mutate 03:11 Mutable tuples 03:23 When is equality the same as identity? 04:55 23 mins ...
This example can be modified to show another potential pitfall when using the walrus operator. Let's change this code to include a comparison operator in theifstatement: importrandomifvalue:=random.randint(0,3)<2:print(f"{value}is less than 2") ...
walrus operator “:=” is used to assign values to a larger expression, also known as assignment expression, exp.: foods = list() while food := input(“Input your favorite foods ”) != “quit”: foods.append(food) 赞 回复 蝎子离群索居 (狭路相逢稳者胜) 组长 楼主 2023-06-27 15:...
Unparenthesized "assignment expression" (use of walrus operator), is restricted at the top level, hence the SyntaxError in the a := "wtf_walrus" statement of the first snippet. Parenthesizing it worked as expected and assigned a. As usual, parenthesizing of an expression containing = ...