Python Copy在Python 的 for 循环中使用 else 语句在其他编程语言中,else 只能与 if-else 搭配使用。但 Python 允许我们在 for 循环中使用 else。只有当循环正常结束时,才可以使用 else 功能。如果循环被强制终止,解释器将忽略 else 语句,因此不会执行它。注 :当循环没有被 break 语句终止时,for/while 后面的...
In Python, you can specify an else statement to a for loop or a while loop. The else block is executed if a break statement is not used.
while循环继续,直到表达式变为假。表达的是一个逻辑表达式,必须返回一个true或false值 while循环的语法是: while expression: statement(s) 1. 2. 这里首先计算表达式语句。如果表达式为true是,然后声明块重复执行,直到表达式变为假。否则,下一个语句之后的语句块被执行。 注:在Python中,所有的缩进字符空格后的编程...
The break statement, like in C, breaks out of the innermost enclosing for or while loop.Python中断语句与C语言类似，打破了最小封闭for或while循环。Loop statements may have an else clause; it is executed when the loop terminates through exhaustion of the list (with for) or when the condition ...
in `haystack`. """ for item in haystack: if item == needle: break else: # The `else` here is a # "completion clause" that runs # only if the loop ran to completion # without hitting a `break` statement. raise ValueError('Needle not found') ...
# Python 的`for` 和`while` 循环支持`else` 子句,# 该子句仅在循环终止而没有遇到`break` 语句时才执行。def contains(haystack, needle): """ Throw a ValueError if `needle` not in `haystack`. """ for item in haystack: if item == needle: break else: # The `else` here is a # "com...
三、for / while - else 结构 It is executed when the loop terminates through exhaustion of the iterable (with for) or when the condition becomes false (with while), but not when the loop is terminated by a break statement.——4.More Control Flow Tools — Python 3.8.14 documentation ...
在python中的while, for和try是有else分支的. 关于while的else分支描述如下 Thewhilestatementisusedforrepeated execution as long as an expressionistrue: while_stmt ::="while"expression":"suite ["else"":"suite] This repeatedly tests the expressionand,ifitistrue, executes the first suite;if ...
也许我遗漏了一些可以使此类代码块更容易破译的东西? 这个问题是关于 底层设计决策 的,即 为什么能够编写这段代码是有用 的。有关 语法含义 的具体问题,另请参阅 Python while 语句中的 Else 子句。 原文由 Kent Boogaart 发布,翻译遵循 CC BY-SA 4.0 许可协议 pythonif-statementfor-loopfor-else...
Python if...else Statement Anifstatement can have an optionalelseclause. Theelsestatement executes if the condition in theifstatement evaluates toFalse. Syntax ifcondition:# body of if statementelse:# body of else statement Here, if theconditioninside theifstatement evaluates to ...