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:
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if bool_result: # 语法块 do # 业务代码块注意缩进 |
参数︰
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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
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>>> insane_status = 'hunger>>> if insane_status == 'hunger': print( 'xiaomu invites insane to dinner' ) xiaomu invites insane to dinner |
实战
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# coding:utf-8info = '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': 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_list[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', 'loafer'))if len(info) > 10 and len(info) != 17: print(info.replace('name', 'iop'))print('finish') |
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['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 *17my name is loaferfinishprocess finished with exit code 0 |
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原文链接：https://blog.csdn.net/m0_48978908/article/details/119428181
