Python built-in functions (33) -- int, python built-in 33int

Python built-in functions (33) -- int, python built-in 33int

English document:

Classint(X = 0)Classint(X,Base = 10)

Return an integer object constructed from a number or stringX, Or return0If no arguments are given. IfXIs a number, returnx.__int__(). For floating point numbers, this truncates towards zero.

IfXIs not a number or ifBaseIs given, thenXMust be a string,bytes, OrbytearrayInstance representing an integer literal in radixBase. Optionally, the literal can be preceded+Or-(With no space in between) and surrounded by whitespace. A base-n literal consists of the digits 0 to n-1,aToz(OrAToZ) Having values 10 to 35. The defaultBaseIs 10. The allowed values are 0 and 2-36. Base-2,-8, and-16 literals can be optionally prefixed0b/0B,0o/0O, Or0x/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 thatint('010', 0)Is not legal, whileint('010')Is, as wellint('010', 8).

 

Note:

1. If no parameter is input, the result 0 is displayed.

>>> int()0

2. When a value is passed in, the _ int _ () method is called, and the floating point number is rounded down.

>>> int(3)3>>> int(3.6)3

3. When a string is input, the conversion is in decimal format by default.

>>> int('36')36>>> int('3.6')Traceback (most recent call last):  File "<pyshell#2>", line 1, in <module>    int('3.6')ValueError: invalid literal for int() with base 10: '3.6'

4. A string can contain "+" and "-", but there must be no space between the plus or minus sign and the value. spaces can appear before and after the value.

>>> int('+36')36>>> int('-36')-36>>> int('   -36        ')-36>>> int(' - 36        ')Traceback (most recent call last):  File "<pyshell#7>", line 1, in <module>    int(' - 36        ')ValueError: invalid literal for int() with base 10: ' - 36   

5. Input a string and specify the hexadecimal notation. Then, convert the string to a 10-hexadecimal integer in the hexadecimal notation.

>>> int('01',2)1>>> int('02',3)2>>> int('07',8)7>>> int('0f',16)15