How to use the int() function in python

int() function is used to convert a string or number into an integer. Next, this article will introduce you to the relevant knowledge of the int() function in python. Friends who are interested should take a look together

int(x, [base])

Function:

The function is to convert a number or base type string into an integer.

Function prototype:

int(x=0)
int(x, base=10), the default value of base is 10, which means no When a value for base is specified, the function treats x as decimal.

Applicable Python version:

Python2.x
Python3.x

Note:

1. x can be a number or a string, but after base is assigned, x can only be a string
2. Can be expressed in base base number

Python English document explanation:

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 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).
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.__index__ method, that method is called to obtain an integer 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.

Code example:

1. When x is a number:

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

2. When x is a string ：

int('23', 16)   # 35
int('Pythontab', 8)   # 出错，Pythontab不是个8进制数

3. base The possible value range is 2~36, including all English letters (not case-sensitive), sixteen F represents 15 in base system, then G will represent 16 in decimal system, and so on....Z represents 35 in hexadecimal system

int('FZ', 16)   # 出错，FZ不能用十六进制表示
int('FZ', 36)   # 575

4. The string 0x can appear in hexadecimal and is regarded as a hexadecimal symbol. Similarly, 0b can appear in binary and is regarded as the number 0 and the letter x

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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