Python3基础条件控制 if ---elif---else Python3 条件控制 Python条件语句是通过一条或多条语句的执行结果(True或者False)来决定执行的代码块。 可以通过下图来简单了解条件语句的执行过程: if 语句 Python中if语句的一般形式如下所示: if condition_1: statement_block_1elif condition_2: statement_block_2else...
File "<stdin>", line 1 [num **2 for num in range(10) if num % 2 == 0 else 0] ^ SyntaxError: invalid syntax 官方文档并没有提及到这个。我就说一下我的理解方法。 1,python解释器看到列表生成式会先找关键字 for,for 后面的部分是为了筛选需要显示的数字,for 前面的表达式则是对这些数字进行...
if 是条件语句。if 语句的语法是 if condition { } 1. 2. 如果condition为真,则执行{和}之间的代码。 不同于其他语言,例如 C 语言,Go 语言里的{ }是必要的,即使在{ }之间只有一条语句。 if 语句还有可选的else if和else部分。 if condition { } else if condition { } else { } 1. 2. 3. 4...
// Code to execute if condition is true } 这里的“condition”是一个布尔表达式,当该表达式的值为真(通常是true或者非零值)时,if语句所包围的代码块(大括号{}中的部分)就会执行。如果条件为假,则跳过这部分代码不执行。 二、SYNTAX VARIATIONS 虽然if语句的逻辑结构在各种语言中通常保持一致,但是其具体语法可...
Python if else语句 (Python if else Statement) The if-else condition is useful when you have multiple conditions to be evaluated in a program. Suppose you want to check for a particular condition and if that evaluates to false, you can then opt for another condition checking to evaluate it....
Syntax if condition: # what we want to execute here. if condition: # what we want to execute here. else: # what we want to execute here. Note:In Python,trueandfalseare written asTrueandFalse. Since Python follow the indentation rule so the statements must write under the indentati...
Along with theifstatement, theelsecondition can be optionally used to define an alternate block of statements to be executed if the boolean expression in theifcondition evaluates toFalse. Syntax: if [boolean expression]: statement1 statement2 ...
Understand Python if-else statements easily with this comprehensive guide. Discover how to use conditional logic to control the flow of your programs.
Python的语法是按英文阅读方式设计的,因此,正常的方式应该是 >>>[xifx%2elsex*100forxinrange(1,10)][1,200,3,400,5,600,7,800,9] 或者用更简洁的形式[false,true][condition] is the syntax: >>>[[x*100,x][x%2]forxinrange(1,10)][1,200,3,400,5,600,7,800,9]...
if[condition#1]:if[condition#1.1]:[statement toexecif#1 and #1.1 are true]else:[statement toexecif#1 and #1.1 are false]else:[alternate statement to execute] Needless to say you can write the same if-else block inside anelseblock too. Or in fact you can add anelifcondition, according...