Python hex() function, convert decimal to hexadecimal

The Python hex() function is used to convert decimal to hexadecimal integers, as a string.

• You may know binary is base 2 (0,1).
• A decimal number is base 10 (0,1,2,3,4,5,6,7,8,9).
• A hexadecimal is base 16 (0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F).

They are just different ways of representing the same number in a computer.

For instance

Syntax

The syntax of the hex function is:

    hex(x)

Parameter Description:

• x decimal integer (base 10)

return value

Returns the hexadecimal number expressed as a string

examples

The following example shows the hex() function in use. It converts the given numbers in decimal into a hexadecimal number:

    >>> hex(255)
    '0xff'
    >>> hex(-42)
    '-0x2a'
    >>> hex(1L)
    '0x1L'
    >>> hex(12)
    '0xc'
    >>> type(hex (12))
    <Class 'str'> # String

Compare these with the above table:

>>> hex(3)
'0x3'
>>> hex(10)
'0xa'
>>> hex(11)
'0xb'
>>> hex(12)
'0xc'
>>> 

Computers sometimes put 0x in front, that means the number is a hexadecimal number. For binary it puts 0b in front (try with bin(10)).

You can also do this for numbers in a list:

>>> numbers = [20,10,40,30,60,50,80,70]
>>> for num in numbers:
...     hex(num)
... 
'0x14'
'0xa'
'0x28'
'0x1e'
'0x3c'
'0x32'
'0x50'
'0x46'
>>>