Python初识逻辑与if语句

原标题：Python初识逻辑与if语句

目录

• 逻辑判断与逻辑语句


• if语句的用法

逻辑判断与逻辑语句

• 对于─件事情正确与否（真假的判断) √ X


• 根据判断的结果做不同的事情，就是我们的逻辑业务


• 对于条件满足的判断语句，就是条件语句


• 一个逻辑语句是由条件语句和业务语句组合而成
  
  

if语句功能

• 判断一个命题的真实性，如果命题为真( True )则执行if的逻辑语句

if语句用法

• 用法:

if bool_result: # 语法块
do # 业务代码块注意缩进


• 参数︰
  
  
  
  • 
    bool_result: 判断结果的真假，布尔类型
  
  
  • 
    do: 如果bool_result为True时执行任意python代码
  
  
  
  


• 返回值: if属于关键字，没有返回值

>>> insane_status = 'hunger文章来源站点https://www.yii666.com/
>>> if insane_status == 'hunger':
print( 'xiaomu invites Insane to dinner' )

xiaomu invites Insane to dinner


实战

# coding:utf-8
info = 'my name is insane'
info_list = info.split()
print(info_list)
if info_list[0] == 'insane':
print(1)
info_list[0] = 'loafer'
if info_list[1] == 'insane':
print(2)
info_list[1] = 'loafer'
if info_list[2] == 'insane':
www.yii666.com print(3)
info_list[2] = 'loafer'
if info_list[-1] == 'insane':
print(4)
info_list[-1] = 'loafer'
print(info_list)
info = ' '.join(info_list)
print(info)
info = 'my name is insane, i am a pythoner, i love python'
info_list = info.split()
if info_list[0] in ['python', 'i']:
info_list[0] = '*'
if info_list[1] == 'python' or info_list[1] == 'i':
info_list[1] = '*'
if info_list[2] == 'python' or info_list[2] == 'i':
info_list[2] = '*'
if info_list[3] == 'python' or info_list[3] == 'i':
info_list[3] = '*'
if info_list[4] == 'python' or info_list[4] == 'i':
info_list[4] = '*'
if info_l文章来源地址48802.htmlist[5] == 'python' or info_list[5] == 'i':
info_list[5] = '*'
if info_list[6] == 'python' or info_list[6] == 'i':
info_list[6] = '*'
if info_list[7] == 'python' or info_list[7] == 'i':
info_list[7] = '*'
if info_list[8] == 'python' or info_list[8] == 'i':
info_list[8] = '*'
if info_list[9] == 'python' or info_list[9] == 'i':
info_list[9] = '*'
if info_list[-1] in ['python', 'i']:
info_list[-1] = '*'
print(info_list)
info = ' '.join(info_list)
print(info)
info = 'my name is insane'
print(len(info))
if len(info) > 10 and len(info) != 15:
print(info.replace('insane'文章来源地址48802.html, 'loafer'))
if len(info) > 10 and len(infwww.yii666.como) != 17:
print(info.replace('name', 'iop'))
print('finish')


['my', 'name', 'is', 'insane']
4
['my', 'name', 'is', 'loafer']
my name is loafer
['my', 'name', 'is', 'insane,', '*', 'am', 'a', 'pythoner,', '*', 'love', '*']
my name is insane, * am a pythoner, * love *
17
my name is loafer
finish
Process finished with exit code 0


来源于：Python初识逻辑与if语句