"""
int
    整数
        正数&负数
    在Python2.X中还有long类型
"""
str00 = "杨贵妃"

print(str00[1])

int00 = 12345
print(str(int00)[2])

for i in str00:
    print(i)

# for i in int00:
#     print(i)

i = 10
i = -10
a = 10
b = 20
print(a + b)
print(type(a + b))
print(a - b)
print(type(a - b))
print(a * b)
print(type(a * b))
print(a / b)
print(type(a / b))
print(b/a)
print(type(b/a))
