条件语句（conditionalstatements）可以帮助检查条件并相应修改程序动作，如if语句：if之后的布尔表达式称之为条件（condition），若为true，则后面缩进的语句（如上print）会执行，否则不会有任何动作。if语句和函数定义有相同结构：header后有一个缩进的body。此类语句称之为复合语句（compoundstatements）。body中不限制语...
a header and an indented suite of statements is called a clause. A compound statement consists of one or more clauses: 1.5.3 Defining Functions II: Local Assignment The effect of anassignment statementis to bind a name to a value in the first frame of the current environment. As a conseq...
最简单的形式是 if 语句: if x > 0: print('x is positive') 1. 2. if 之后的布尔表达式被称作条件(condition)。 如果它为真,则缩进的语句会被执行。 如果不是,则什么也不会发生。 if 语句和函数定义有相同的结构:一个语句头跟着一个缩进的语句体。 类似的语句被称作复合语句(compound statements)。 ...
Python has simple and compound statements. A simple statement is a construct that occupies a single logical line, like an assignment statement. A compound statement is a construct that occupies multiple logical lines, such as a for loop or a conditional statement. An expression is a simple ...
Compound if Statement in C/C++, Perl, and Java 其他语言,比如 Algol 和 Pascal,用关键字begin和end来括住块。 哪个更好? 情人眼里出西施。总的来说,程序员倾向于强烈地感受到他们是如何做事的。关于越位规则优点的辩论可能会相当激烈。 有利的一面是: Python 对缩进的使用是干净、简洁和一致的。 在不使...
Conditional expressions also use short-circuit evaluation like compound logical expressions. Portions of a conditional expression are not evaluated if they don’t need to be. In the expression <expr1> if <conditional_expr> else <expr2>: If <conditional_expr> is true, <expr1> is returned and...
The sequence of statements within a compound statement. boolean expression An expression whose value is eitherTrueorFalse. branch One of the alternative sequences of statements in a conditional statement. chained conditional A conditional statement with a series of alternative branches. ...
通常不推荐复合语句(Compound statements: 多条语句写在同一行)。 #Yes if foo == 'blah': do_blah_thing() do_one() do_two() do_three() #No if foo == 'blah': do_blah_thing() do_one(); do_two(); do_three() 尽管有时可以在if/for/while 的同一行跟一小段代码,但绝不要跟多个子...
elif x%3 == 0 print (Divisible by 3 and not by 2) COMPOUND BOOLEANS if x <y and x <z: print ('x is the least') elif y < z: print ('y is least') else: print ('z is the least) * pay attention to the indentation
通常不推荐复合语句(Compound statements: 多条语句写在同一行)。 # Yesif foo == 'blah': do_blah_thing() do_one() do_two() do_three()# Noif foo == 'blah': do_blah_thing() do_one(); do_two(); do_three() 尽管有时可以在if/for/while 的同一行跟一小段代码,但绝不要跟多个子句...