true-expr或false-expr可以是任何Python代码。它和下面的代码效果相同: if condition: value = true-expr else: value = false-expr 下面是一个更具体的例子: In [126]: x = 5 In [127]: 'Non-negative' if x >= 0 else 'Negative' Out[127]: 'Non-negative' 和if-else一样,只有一个表达式会被...
There's something satisfying to me about having a unified style regardless of whether or not you use an intermediate variable for your condition. And once again, if you change between these two formats, none of the actual lines with conditions changed here, making git-blame that much more ...
这个评估为True,因此块#2被执行,因此,Python 在整个if/elif/elif/else子句之后恢复执行(我们现在可以称之为if子句)。if子句之后只有一条指令,即print调用,它告诉我们我今年将支付3000.0的税款(15,000 * 20%)。请注意,顺序是强制性的:if首先出现,然后(可选)是您需要的尽可能多的elif子句,然后(可选)是一个els...
# Here is a lengthier block comment that spans multiple lines using # 2 # several single-line comments in a row. # # 3 # These are known as block comments. if someCondition: # Here is a comment about some other code: # 4 someOtherCode() # Here is an inline comment. # 5 注释通...
made up of multiple lines and sentences.""" 缩进 任何一种编程语言都有各自的语法和编程规范,Python 之所以以‘优雅,简单’著称,其中一个最重要的原因,就是它的“缩进”。大部分的编程语言都是使用“{}”来表示一个语句块或者代码段,而 Python 用缩进层次来组织代码块,而约定一个缩进是用‘4个空格’来表示...
made up of multiple lines and sentences.""" 注释使用"#"开头 # This is a comment. # This is a comment, too. # This is a comment, too. # I said that already. 3.换行输出print 函数print默认就是换行的,当被赋予变量时,表示从命令行模式中获取输入 ...
If - Else <expression_if_true> if <condition> else <expression_if_false> >>> [a if a else 'zero' for a in (0, 1, 0, 3)] ['zero', 1, 'zero', 3] Namedtuple, Enum, Dataclass from collections import namedtuple Point = namedtuple('Point', 'x y') point = Point(0, 0) ...
Example of multiple lines inside if statement It is perfectly fine to have more lines inside theifstatement, as shown in the below example. The script will return two lines when you run it. If the condition is not passed, the expression is not executed. ...
If - Else <expression_if_true> if <condition> else <expression_if_false> >>> [a if a else 'zero' for a in (0, 1, 0, 3)] ['zero', 1, 'zero', 3] Namedtuple, Enum, Dataclass from collections import namedtuple Point = namedtuple('Point', 'x y') point = Point(0, 0) ...
Tip: If you only have a line of code to be executed rather than multiple lines in the code following the condition, you can place it all in the same line. This is not a rule but just a common practise amongst coders. Rewriting the code from above in this style: score_theory = 40 ...