int() 函數用來將字串會數字轉換為整數型。接下來透過本文來跟大家介紹python 中的int()函數的相關知識,有興趣的朋友一起看看吧
int(x, [base])
#功能:
函數的作用是將一個數字或base類型的字串轉換成整數。
函數原型:
int(x=0)
int(x, base=10),base缺省值為10,也就是說不指定base的值時,函數將x以十進位處理。
適用Python版本:
Python2.x
Python3.x
注意:
#1. x 可以是數字或字串,但是base被賦值後x 只能是字串
2. x 作為字串時必須是base 類型,也就是說x 變成數字時必須能用base 進位表示
Python英文文件解釋:
class int(x=0)
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 is a number, return x.__int__(). For floating point numbers, this truncates towards zero.##If x 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 spaceor - with no base. Optionally, the literal can be preceded by spaceor - withen 產品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 literals in code. Base 0 means to interpret exactly as a ualcode the , that ual 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).
The integer type is described in Numeric Types — int, float, complex.
Changed in version 3.4: If base is not an instance of int and the base object has a base.__ for the base. Previous versions used base.__int__ instead of base.__index__.
Changed in version 3.6: Grouping digits with underscores as in code literals is allowed.
################################################### #########1. x 是數字的情況:############
int(3.14) # 3 int(2e2) # 200 int(100, 2) # 出错,base 被赋值后函数只接收字符串
int('23', 16) # 35 int('Pythontab', 8) # 出错,Pythontab不是个8进制数
int('FZ', 16) # 出错,FZ不能用十六进制表示 int('FZ', 36) # 575
int('0x10', 16) # 16,0x是十六进制的符号 int('0x10', 17) # 出错,'0x10'中的 x 被视作英文字母 x int('0x10', 36) # 42804,36进制包含字母 x
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