按照传统做法，可以写为：for line in lines: strs = re.findall(pattern, line)if strs: print(strs)可以被简化为：for line in lines:if strs := re.findall(pattern, line) print(strs)注意事项不能直接使用海象运算符赋值，像这样的赋值：a := 10是错误的语法。海象运算符只能在Python ...
In [2]: walrus Out[2]: False In [3]: (walrus := True) Out[3]: True In [4]: walrus Out[4]: True 1. 2. 3. 4. 5. 6. 7. 8. 9. 第1 行: 显示了一个传统的赋值语句,将值 False 赋给了 walrus。 第3 行: 使用海象运算符将值 True 赋给 walrus。 在上面的“walrus”变量中,...
根据我有限的经验,我发现它在替换无限while循环中最有用: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 whileTrue:p=input("Enter the password: ")ifp=="the password":break# when converting to walrus operator...while(p:=input("Enter the password: "))!="the password":continue 能够将while...
在Python 3.8 及更高版本中,引入了一种新的语法特性,称为"海象运算符"(Walrus Operator),它使用 := 符号。这个运算符的主要目的是在表达式中同时进行赋值和返回赋值的值。使用海象运算符可以在一些情况下简化代码,尤其是在需要在表达式中使用赋值结果的情况下。这对于简化循环条件或表达式中的重复计算很有用。
Typically, the assignment will happen in the local scope, but if the target name is already declared global or nonlocal, that declaration is honored. The precedence of the walrus operator can cause some confusion. It binds less tightly than all other operators except the comma, so you might ...
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。改用walrus运算符就可以写成这样 ...
Conditional Expressions or the Ternary Operator Identity Operators and Expressions in Python Membership Operators and Expressions in Python Concatenation and Repetition Operators and Expressions The Walrus Operator and Assignment Expressions Bitwise Operators and Expressions in Python Operator Precedence in Python...
Python walrus traverse container In the following example, we use the walrus operator when traversing a list of dictionaries. traversing.py #!/usr/bin/python users = [ {'name': 'John Doe', 'occupation': 'gardener'}, {'name': None, 'occupation': 'teacher'}, ...
In this article, we will discuss the basics of the Python walrus operator using conditional statements and loops.
compile(".. [#] {reference}")>>> for line in pep498.splitlines():... if result := references_pattern.parse(line):... print(result["reference"])...%-formattingstr.format[ ... ]PEP 461 rejects bytes.format()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...