Python 编程中 while 语句用于循环执行程序,即在某条件下,循环执行某段程序,以处理需要重复处理的相同任务。其基本形式为: while 判断条件(condition): 执行语句(statements)…… 1. 2. 执行语句可以是单个语句或语句块。判断条件可以是任何表达式,任何非零、或非空(null)的值均为true。 当判断条件假 false 时,...
foriterating_varinsequence: statements(s) 示例如下: forletterin'Python':# 第一个实例print('当前字母 :', letter) fruits = ['banana','apple','mango']forfruitinfruits:# 第二个实例print('当前水果 :', fruit)print("Good bye!") 输出如下: 当前字母 : P 当前字母 : y 当前字母 : t 当前字...
There are 2 main parts of any “if” statement: the condition, and the statements that you want python to execute. “if”语句由2个主要部分组成:条件和你希望python执行的语句。 “If” statements evaluate any condition that you pass to it in the same line. This is mostly selfexplanatory. If...
Python 编程中 while 语句用于循环执行程序,即在某条件下,循环执行某段程序,以处理需要重复处理的相同任务。其基本形式为: while 判断条件(condition): 执行语句(statements)…… 1. 2. 执行语句可以是单个语句或语句块。判断条件可以是任何表达式,任何非零、或非空(null)的值均为true。 当判断条件假 false 时,...
<statements3> 2、基本列子 除了开头的if测试及其关联的语句外,其他所有部分都是可选择。 >>> if 1: ... print 'True' ... True 需要处理测试为假的情况,需要else。else就是所有测试条件都不满足情况下的默认选择 >>> if not 1: ... print 'true' ...
Pythonfor 循环语句 语法: for循环的语法格式如下: for iterating_var in sequence: statements(s) 实例: #!/usr/bin/python # -*- coding: UTF-8 -*- forletterin'Python':# 第一个实例 print(‘当前字母:’,letter) fruits=['banana','apple','mango']...
Compared to if alone, if else provides a choice if the condition is not satisfied. The format of the Else statement is "else:". Continue the previous program, add else statements after the entire if statement, and output else programs when the age is not greater than or equal to 18.三...
Logical and comparison operators are often used withif...elsestatements. VisitPython Operatorsto learn more. Also Read Python pass Statement Python break and continue Before we wrap up, let’s put your knowledge of Python if else to the test! Can you solve the following challenge?
for <variable> in <sequence>: <statements> languages = ["C", "C++", "Perl", "Python"...
Usematch-casestatements when you need to check multiple values of a single variable, especially in Python 3.10 or later. Common Mistakes and Debugging Tips 1. Indentation Errors Python uses indentation to define blocks of code. Missing indentation will cause an error. ...