python学习-10 运算符1

1.加+，减-，乘*，除/

例如：

a = 1

b = 2

c = a + b

print(c)

运算结果：

3

Process finished with exit code 0

a = 1

b = 2

c = a - b

print(c)

运算结果：

-1

Process finished with exit code 0

a = 1

b = 2

c = a * b

print(c)

运算结果：

2

Process finished with exit code 0

a = 1

b = 2

c = a / b

print(c)

运算结果：

0.5

Process finished with exit code 0

2.特殊的幂 **，取余%，//取商

例如：

a = 1

b = 2

c = a ** b

print(c)

运算结果：

1

Process finished with exit code 0

a = 9

b = 2

c = a % b

print(c)

运算结果：

1

Process finished with exit code 0

a = 9

b = 2

c = a // b

print(c)

运算结果：

4

Process finished with exit code 0

3.in 和 not in 表示判断

判断某个东西是否在**里

例如：

name = 'abd'        #'abd'  字符串  ； 'a' 字符

if 'a' in name:     #   如果a在name里

    print('ok')

else:

    print('error')

运行结果：

ok

Process finished with exit code 0

ps:

子字符串：

name = 'abd'        #'abd'  字符串  ； 'a' 字符

#'bd'  子字符串或者叫子序列

if 'ad' in name:     #   如果a在name里

    print('ok')

else:

    print('error')

运行结果：

error

Process finished with exit code 0

not in:

name = 'abd'

if 'a' not in name:

    print('ok')

else:

    print('error')

运行结果：

error

Process finished with exit code 0

巴特西