Python运算符

Python运算符

Python中运算符需要特殊注意的，取整型运算符“//”，和除运算符“/”，两者的区别在于如果是浮点数相除，前者是整除的数值，后者是精确地值。

逻辑运算符中and和or和C中的&&和||类似。另外不等于运算符“<>”返回值为True（不同）和False（相同）。

#Pyton运算符
a = 21.0
b = 10.0
c = 0

c = a + b
print "加和赋值运算符 c is ", c

c = a - b
print "减和赋值运算符c is ", c 

c = a * b
print "乘和赋值运算符c is ", c 

c = a / b
print "除和赋值运算符c is ", c 


c = a % b
print "取模和赋值运算符c is ", c

a = 2
b = 3
c = a**b 
print "幂和赋值运算符c is ", c

a = 10
b = 5
c = a//b 
print "取整除和赋值运算符c is ", c
#判断a和b是否不相等，不相等为True，相等为False
c= a<>b
print "比较不等和赋值运算符c is ", c
#Python逻辑运算符
c=0
if not a:
    print "a and c :",(a and c)
    print"c and a :",(a and c)
    print "a or c:",(a or c)
    print "c or a:",(c or a)
else:
    print "a,b,c:",a,b,c
    print "a and c :",(a and c)
    print"c and a :",(c and a)
    print "a or c:",(a or c)
    print "c or a:",(c or a)
    print "a and b :",(a and b)
    print"b and a :",(b and a)
    print "a or b:",(a or b)
    print "b or a:",(b or a)
#成员运算符
list = [1, 2, 3, 4, 5 ];
if b in list:
    print "b in list:",b in list
if a in list:
    print "a not in list:",a not in list
print "a not in list:",a in list
#身份运算符

#a和b是列表
a=[10]
b=[10]
c=d=10
if a is b:
    print "a is b:",a is b
else:
    print "a is b:",a is b    
if c is d:
    print "c is d:",c is d  
#a和b是单个的数值    
a=10
b=10
c=d=10
if a is b:
    print "a is b:",a is b
else:
    print "a is b:",a is b    
if c is d:
    print "c is d:",c is d 

输出结果：

加和赋值运算符 c is  31.0
减和赋值运算符c is  11.0
乘和赋值运算符c is  210.0
除和赋值运算符c is  2.1
取模和赋值运算符c is  1.0
幂和赋值运算符c is  8
取整除和赋值运算符c is  2
比较不等和赋值运算符c is  True
a,b,c: 10 5 0
a and c : 0
c and a : 0
a or c: 10
c or a: 10
a and b : 5
b and a : 10
a or b: 10
b or a: 5
b in list: True
a not in list: False
a is b: False
c is d: True
a is b: True
c is d: True

上述标有红色的进行特别说明，当俩个值为数值时分别赋相同的值，进行身份验证时True，当俩个值为列表时身份验证时为False

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