6 数据应用

a = 9
b = 2
print(a + b)
print(a - b)
print(a * b)
print(a / b)    # 正常除法
print(a // b)   # 向下取整
print(a % b)    # 取模，即除法的余数
print(a ** b)   # 幂，a的b次幂

11
7
18
4.5
4
1
81

a = 9
b = 2
print(a == b)
print(a != b)
print(a > b)
print(a < b)
print(a >= b)
print(a <= b)

False
True
True
False
True
False

a = 10
a += 1     # a = a + 1
print(a)
a -= 1      # a = a - 1
print(a)
a *= 3      # a = a * 3
print(a)
a /= 3      # a = a / 3
print(a)
a %= 4      # a = a % 4
print(a)
a **= 2      # a = a ** 2
print(a)
a //= 2      # a = a // 2
print(a)

11
10
30
10.0
2.0
4.0
2.0

a = 9
b = 2
c = None

if(a>5 and b>6):
    print(‘true‘)
else:
    print(‘false‘)

if(a>5 or b>5):
    print(‘true‘)
else:
    print(‘false‘)

if(c is not None):
    print(‘true‘)
else:
    print(‘false‘)  

false
true
false

my_tuple = (1, 2, 3, 4, 5)

if(1 in my_tuple):
    print(‘true‘)
else:
    print(‘false‘)

if(10 not in my_tuple):
    print(‘true‘)
else:
    print(‘false‘)

true
true

a = [10, 20, 30]
b = [10, 20, 30]

if(a is b):
    print(‘true‘)
else:
    print(‘false‘)
print(id(a))    # 内存地址
print(id(b))

false
44016968
43987272