Python比较语句详解-优快云博客

比较

在Python中比较语句和其它的一样都是用if来做判断的，只是语法上后面会带上冒号，如if a>b:,相当于if（a>b）{}.

同样你可以判断函数的返回值为True或者False来做判断

__author__="Alex" __date__ ="$2011-2-17 10:39:27$" if __name__ == "__main__": print "Hello"; a = 3 b = 2 c = 2 # True statements if c == b: print('c is equal as b') if c >= b: print('...') if a >= b: print('a is greater than b') if c <= a: print('c is less than a.') if c != a: print('c is not equal as a') # False statements if c == a: print('...')# will show nothing on console if c != b: print('...')# will show nothing on console def inside(): return True if inside(): print ("Inside") else: print("OutSide")

Console OutPut:

Hello c is equal as b ... a is greater than b c is less than a. c is not equal as a Inside

多重比较：

当然你可能会用到且或这些操作，在Python中是使用and/or 来做到的，看代码吧，从代码中学习语言才是王道:

__author__="Alex" __date__ ="$2011-2-17 10:39:27$" if __name__ == "__main__": print "Hello"; if 4 > 3 and 6 > 3: print('You are right , 4 is greater than 3 and 6 is greater than 3 too') # will print, True and True becomes True if 4 > 3 and 2 > 3: print('...') # will not print, True and False becomes False if 4 > 3 and not 2 > 3: print('You are right , 4 is greater than 3 and 2 is less than 3 ') # will print, True and not False becomes True if 4 > 3 or 6 > 3: print('You are right...,When 4 is grater than 3 is ture, the condition is ture') # will print, True or True becomes True if (4 > 3 and 6 > 3) and not ( 3 > 5 or 3 > 7): print("(True and True) and not ( False or False ) becomes True and not False")#Complex Multiple Conditions

Console Output:

Hello You are right , 4 is greater than 3 and 6 is greater than 3 too You are right , 4 is greater than 3 and 2 is less than 3 You are right...,When 4 is grater than 3 is ture, the condition is ture (True and True) and not ( False or False ) becomes True and not False