if not condition: # Do something... 在此示例中,condition可以是布尔表达式或任何有意义的 Python 对象。例如,condition可以是包含字符串、列表、字典、集合甚至用户定义对象的变量。 如果condition计算结果为 false,则not返回True并if运行代码块。如果condition计算结果为真,则not
condition2 = Trueresult= condition1orcondition2 print(result)# 输出: True# 示例2:与比较运算符结合使用a=10b =5result= (a> b)or(a<0) print(result)# 输出: True 短路行为 与and类似,or也有短路行为:如果第一个条件为True,则不会评估第二个条件,因为无论第二个条件是什么,整个表达式的结果都将是...
else: condition2 3, 格式三: if 条件: condition elif 条件2: condition2 else: condition3 特点: 1, 只有满足条件的情况下才会执行 2, 并且第2,3中只会执行其中的一部分语句 """ # 1, if第一种格式 age = 20 # if age > 18: # print("可以上网啦!") # 2, if else # if age > 18: #...
如果"condition_1" 为 True 将执行 "statement_block_1" 块语句 如果"condition_1" 为False,将判断 "condition_2" 如果"condition_2" 为 True 将执行 "statement_block_2" 块语句 如果"condition_2" 为False,将执行"statement_block_3"块语句 Python 中用elif代替了else if,所以if语句的关键字为:if – ...
The condition count>5 checks if the number of records is greater than 5. The while loop executes till count is less than 5. Once count‘s value becomes 6, the loop will terminate. Methods of implementing the not boolean operator in Python Method 1: Using the ‘not’ keyword var = False...
After a clear explanation of all code snippets showing how the if-not conditional statement works in Python, we conclude that the if-not statement always negates the output of the if statement. Based on the condition assigned, it will either return the "if not" part or the "else" part ...
if not Condition: # Statement block Here’s an example of using the logical operator named Not in Python user_age = int(input("Enter your age: ")) if not user_age > 18: print(f"You cannot donate blood, please come back after {18-user_age} years") ...
Python 中if not条件的示例 if语句与not逻辑运算符结合以评估条件是否未发生。这篇文章解释了如何在 Python 中使用if not条件。 ADVERTISEMENT Stay 这是一个演示这种情况的代码块。 ifnota_condition:block_of_code_to_execute_if_condition_is_false
In this article, you have learned different ways to check if the string is empty or not in Python. Since empty strings are considered as false in Python, we can directly use it on the if condition to check or use it with eithernotoperator orbool()function. And also learned to use the...
2019-12-11 19:55 −if-else语法 语法:if condition { }。关键字为condition。 package main import "fmt" func main() { num := 11 if num > 10 { // 首次判断条件 fmt.Println("数... kuanglinfeng 0 582 if-else语句与for循环 2019-12-10 15:34 −if-else基本用法 if 条件{ else if ...