python基础之if语句,,python之if语
python基础之if语句,,python之if语
python之if语句
通用格式
if <test1>: <do something>elif: <do something>else: <do something>if 语句的判断条件可以用>(大于)、<(小于)、==(等于)、>=(大于等于)、<=(小于等于)来表示其关系
一些例子
例1:
# -*- coding: UTF-8 -*-flag = Falsename = ‘luren‘if name == ‘python‘: flag = True print ‘welcome boss‘ else: print name 输出结果为:>>> luren
例2:
# -*- coding: UTF-8 -*-num = 5 if num == 3: print ‘boss‘ elif num == 2: print ‘user‘elif num == 1: print ‘worker‘elif num < 0: print ‘error‘else: print ‘roadman‘输出结果为:>>> roadman
例3:
# -*- coding: UTF-8 -*-num = 9if num >= 0 and num <= 10: print ‘hello‘else: print ‘undefine‘输出结果为:>>> hello
if-else多种写法
例:
a, b = 1, 21.常规if a>b: c = aelse: c = bprint c2.表达式c = a if a>b else bprint c3. 二维列表c = [b,a][a>b]print c
python基础之if语句
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