Python 2.7 Str(055) Returns "45" Instead Of 055

Why I get the following result in python 2.7, instead of '055'? >>> str(055) '45'

Solution 1:

055 is an octal number whose decimal equivalent is 45, use oct to get the correct output.

>>> oct(055)
'055'

Syntax for octal numbers in Python 2.X:

octinteger     ::=  "0" ("o" | "O") octdigit+ | "0" octdigit+

But this is just for representation purpose, ultimately they are always converted to integers for either storing or calculation:

>>>x = 055>>>x
45
>>>x = 0xff# HexaDecimal>>>x
255
>>>x = 0b111# Binary>>>x
7
>>>0xff * 055
11475

Note that in Python 3.x octal numbers are now represented by 0o. So, using 055 there will raise SyntaxError.