python运算符，,python中的运算

python运算符，,python中的运算

python中的运算符包括多种多样的，可以分为以下几个大类

第一种：算数运算

第二种：比较运算

第三种：赋值运算

第四种：逻辑运算

1,优先级

在没有()的情况下not 优先级高于and，and优先级高于or，即优先级关系为( )>not>and>or，同一优先级从左往右计算。例题：判断下列逻辑语句的True，False。or中有一个为真，则为Trueand中有一个为假，则为false

3>4 or 4<3 and 1==1        True1 < 2 and 3 < 4 or 1>2        True2 > 1 and 3 < 4 or 4 > 5 and 2 < 1        True1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8        False1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6        Falsenot 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 <6    Falseprint(1>2 and 3 or 4 and 3 < 2) == 0

2 ,or 和and

x or y , x为真，值就是x，x为假，值是y；非0转换为布尔值为True，0转换为布尔值为False，除了0都显示前一位x and y, x为真，值是y,x为假，值是x。除了0，显示都是后一位

print(int(True))  == 1print(int(False))    ==0

8 or 4 80 and 3 30 or 4 and 3 or 7 or 9 and 6 3print(2 or 1 < 3) == 2print(2 or 1 < 3 and 2) == 2

第五种：成员运算

in,not in :判断子元素是否在原字符串（字典，列表，集合）中：例如：#print(‘喜欢‘ in ‘dkfljadklf喜欢hfjdkas‘)#print(‘a‘ in ‘bcvd‘)#print(‘y‘ not in ‘ofkjdslaf‘)

第六种：身份运算

第七种：位运算

a = 60            # 60 = 0011 1100b = 13            # 13 = 0000 1101c = 0  c = a & b;        # 12 = 0000 1100print "Line 1 - Value of c is ", c  c = a | b;        # 61 = 0011 1101print "Line 2 - Value of c is ", c  c = a ^ b;        # 49 = 0011 0001 #相同为0，不同为1print "Line 3 - Value of c is ", c  c = ~a;           # -61 = 1100 0011print "Line 4 - Value of c is ", c  c = a << 2;       # 240 = 1111 0000print "Line 5 - Value of c is ", c  c = a >> 2;       # 15 = 0000 1111print "Line 6 - Value of c is ", c

总结运算符的优先级

python运算符