Detailed explanation of conversion between different bases in Python

Different bases

Binary 0b101

The binary number starting with the number 0 and the letter b represents a binary number. If a number greater than or equal to 2 appears, a SyntaxError exception will be thrown

Octal 0711

Numbers starting with 0 represent octal numbers. If a number greater than or equal to 8 appears, a SyntaxError exception will be thrown

Decimal 123

Letters cannot appear in normal display

Hexadecimal 0x15

The hexadecimal number starting with the number 0 and the subtitle x can appear 0-9 and abcdef or ABCDEF will throw a SyntaxError exception when other values ​​appear

python After 2.6Built-in function

#Convert decimal to binary

>>> bin(10)
'0b1010'

#Convert binary to decimal

>>> int("1001",2)
9

#Convert decimal to hexadecimal

>>> hex(10)
'0xa'

#16 to decimal

>>> int('ff', 16)
255

>>> int('0xab', 16)
171

#Convert decimal to octal

>>print("%o" % 10)
>>12

#16 base to binary system

>>> bin(0xa)
'0b1010'
>>>

#10 base system to 8 base system

>>> oct(8)
'010'

#2 base system to 16 base system

>>> hex(0b1001)
'0x9'

In addition, in the interactive In the interpreter environment, python will automatically convert different base systems into decimal systems for calculation.

>>> 0b101 + 0711 + 123 + 0x15 
606

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