python 数字类型与操作符

• • Python 数字类型
  • • 1. Booleans
    • • 1.1 常见搭配表达符
    • 2. Integers(int)
    • • 2.1 常见操作符
    • 3. Floating point
    • • 3.1 常见操作符
    • 4. math 模块
    • 5. 比较符
    • 6. 类型转换

Python 有4种数组类型：

• Booleans (布尔)
• Integers （整数）
• Floating point （浮点数）
• Complex (Imaginary numbers) （复数和虚数）

a = True
b = False

and, or, not

a = 37
b = -299392993727716627377128481812241231
c = 0x7fa8      # Hexadecimal
d = 0o253       # Octal
e = 0b10001111  # Binary

x + y      Add
x - y      Subtract
x * y      Multiply
x / y      Divide (produces a float)
x // y     Floor Divide (produces an integer)
x % y      Modulo (remainder)
x ** y     Power
x << n     Bit shift left
x >> n     Bit shift right
x & y      Bit-wise AND
x | y      Bit-wise OR
x ^ y      Bit-wise XOR
~x         Bit-wise NOT
abs(x)     Absolute value

a = 37.45
b = 4e5 # 4 x 10**5 or 400,000
c = -1.345e-10

与整数的操作符相比，没有了按位运算。

x + y      Add
x - y      Subtract
x * y      Multiply
x / y      Divide
x // y     Floor Divide
x % y      Modulo
x ** y     Power
abs(x)     Absolute Value

import math
a = math.sqrt(x)
b = math.sin(x)
c = math.cos(x)
d = math.tan(x)
e = math.log(x)

x < y      Less than
x <= y     Less than or equal
x > y      Greater than
x >= y     Greater than or equal
x == y     Equal to
x != y     Not equal to

a = int(x)    Convert x to integer
b = float(x)  Convert x to float