Python中的int函数

python帮组文档

class int(x, base=10)

Return an integer object constructed from a number or string x, or return 0 if no arguments are given. If x defines __int__(), int(x) returns x.__int__(). If x defines __trunc__(), it returns x.__trunc__(). For floating point numbers, this truncates towards zero.

If x is not a number or if base is given, then x must be a string, bytes, or bytearray instance representing an integer literal in radix base. Optionally, the literal can be preceded by + or - (with no space in between) and surrounded by whitespace. A base-n literal consists of the digits 0 to n-1, with a to z (or A to Z) having values 10 to 35. The default base is 10. The allowed values are 0 and 2–36. Base-2, -8, and -16 literals can be optionally prefixed with 0b/0B, 0o/0O, or 0x/0X, as with integer literals in code. Base 0 means to interpret exactly as a code literal, so that the actual base is 2, 8, 10, or 16, and so that int('010', 0) is not legal, while int('010') is, as well as int('010', 8).

个人理解

• 返回一个整型数据
• int()---没有参数，直接返回0
• int(X)---X任意数值，整数直接返回，小数截断返回
• base-- 进制
  • • 有base参数，X必须是一个字符串
    • 将X按照base进制读取，分析
    • 默认是十进制 如 int(‘10’)
    • 返回十进制数

代码演示

int(10.9 int(10)