if not 是Python中的条件判断语句之一，其含义为“如果不是”的意思。在条件成立时执行某个代码块，并在条件不成立时执行另一个代码块。通过该语句，我们可以快速地根据不同情况编写相应的逻辑结构，使程序更加灵活。一个典型的if not语句的结构如下：if not condition: # 如果不满足条件 在Python中...
assert condition 如果condition为 false,就 raise 一个AssertionError出来。逻辑上等同于: if not condition: raise AssertionError() 另一种用法: assert condition,expression 如果condition 为 false,就 raise一个描述为 expression 的AssertionError出来。逻辑上等同于: if not condition: raise AssertionError(expressi...
if condition: # 条件为真时执行的操作 else: # 条件为假时执行的操作 示例: x = 2 if x > 5: print("x is greater than 5") else: print("x is not greater than 5") 如果x 大于5,会打印第一个消息;否则,会打印第二个消息。 3. If-Elif-Else 语句 使用elif(是 "else if" 的简写),即 ...
下面是完整的代码示例: # 定义函数defmy_function(condition):ifcondition:# 如果条件成立,则不执行该函数passelse:# 执行其他操作print("Condition is not met.")# 调用函数my_function(True)# 如果为True,则不执行函数体my_function(False)# 如果为False,则执行函数体 1. 2. 3. 4. 5. 6. 7. 8. 9....
在Python中，if语句的基本语法是：if condition:statement(s)如果条件condition为真，则执行if语句后面缩进的语句块。例如:if x <0:pass 如果x小于0，则执行空语句pass。2、多重条件 if语句可以与elif和else语句一起使用，实现多重条件判断。例如：if x<0:print('x是负数')elif x==0:print('x是零')else...
Let’s understand more use cases of If Not in Python. How to use If Not in Python to Reverse the Condition Result The main purpose of the Not operator is to reverse the original result of the boolean value(True or False), which means if the condition returns True, then the Not operato...
We have chained four statements to form our condition. It is, however, beneficial to group the already chained statements by using parenthesis: if (x > x1 and x < x2) and (y > y1 and y > y2): print('inside') Grouping with parenthesis helped, but we can streamline this statement ...
If `condition` is a string (e.g. ‘${rc} < 10’), it is evaluated as a Python expression using the built-in ‘eval’ function and the keyword status is decided based on the result. If a non-string item is given, the status is got directly from its truth value. ...
If `condition` is a string (e.g. ‘${rc} < 10’), it is evaluated as a Python expression using the built-in ‘eval’ function and the keyword status is decided based on the result. If a non-string item is given, the status is got directly from its truth value. ...
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