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howto print binary number

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dmitrey.kroshko at scipy

May 7, 2008, 1:13 PM

Post #1 of 7 (3407 views)
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howto print binary number

hi all,
could you inform how to print binary number?
I.e. something like

print '%b' % my_number

it would be nice would it print exactly 8 binary digits (0-1, with
possible start from 0)

Thank you in advance, D
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mensanator at aol

May 7, 2008, 1:31 PM

Post #2 of 7 (3381 views)
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Re: howto print binary number [In reply to]

On May 7, 3:13 pm, dmitrey <dmitrey.kros...@scipy.org> wrote:
> hi all,
> could you inform how to print binary number?
> I.e. something like
>
> print '%b' % my_number
>
> it would be nice would it print exactly 8 binary digits (0-1, with
> possible start from 0)
>
> Thank you in advance, D

The gmpy works good.

>>> import gmpy
>>> print gmpy.digits(66,2).zfill(8)
01000010
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castironpi at gmail

May 7, 2008, 1:40 PM

Post #3 of 7 (3380 views)
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Re: howto print binary number [In reply to]

On May 7, 3:31 pm, Mensanator <mensana...@aol.com> wrote:
> On May 7, 3:13 pm, dmitrey <dmitrey.kros...@scipy.org> wrote:
>
> > hi all,
> > could you inform how to print binary number?
> > I.e. something like
>
> > print '%b' % my_number
>
> > it would be nice would it print exactly 8 binary digits (0-1, with
> > possible start from 0)
>
> > Thank you in advance, D
>
> The gmpy works good.
>
> >>> import gmpy
> >>> print gmpy.digits(66,2).zfill(8)
>
> 01000010

>>> print '\n'.join( [. ''.join( [. str( a>> i & 1 ) for i in range( 7, -1, -1 ) ]
) for a in range( 10 ) ] )
00000000
00000001
00000010
00000011
00000100
00000101
00000110
00000111
00001000
00001001
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gherron at islandtraining

May 7, 2008, 1:44 PM

Post #4 of 7 (3386 views)
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Re: howto print binary number [In reply to]

dmitrey wrote:
> hi all,
> could you inform how to print binary number?
> I.e. something like
>
> print '%b' % my_number
>
> it would be nice would it print exactly 8 binary digits (0-1, with
> possible start from 0)
>
> Thank you in advance, D
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Python 3.0 has such a formatting operation, but Python 2.x does not.
However it's not hard to write.

If you really only going to need 8 bits, you can just build a table of
bit patterns for each integer. Try this bit of slight cleverness:

>>> b = ['']
>>> for k in range(8):
... b = [i+j for i in ['0','1'] for j in b]
...
>>> len(b)
256
>>> b[63]
'00111111'

Gary Herron

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jjb5 at cornell

May 7, 2008, 2:03 PM

Post #5 of 7 (3385 views)
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Re: howto print binary number [In reply to]

> Python 3.0 has such a formatting operation, but Python 2.x does not.
> However it's not hard to write.

Indeed. Refraining from using named lambdas:

>>> def bin(x):
... return ''.join(x & (1 << i) and '1' or '0' for i in
... range(7,-1,-1))
...
>>> bin(12)
'00001100'
>>> bin(63)
'00111111'

It would be nice to have str(x, 2) like int(x, 2), but there are bigger
fish in pond.

Joel
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ivan.illarionov at gmail

May 7, 2008, 2:46 PM

Post #6 of 7 (3380 views)
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Re: howto print binary number [In reply to]

On Wed, 07 May 2008 13:13:40 -0700, dmitrey wrote:

> hi all,
> could you inform how to print binary number? I.e. something like
>
> print '%b' % my_number
>
> it would be nice would it print exactly 8 binary digits (0-1, with
> possible start from 0)
>
> Thank you in advance, D

Here it is:

def bin(x, digits=0):
oct2bin = ['000','001','010','011','100','101','110','111']
binstring = [oct2bin[int(n)] for n in oct(x)]
return ''.join(binstring).lstrip('0').zfill(digits)

>>> bin(5)
'101'
>>> bin(0x0FFF, 16)
'0000111111111111'
>>> bin(5, 8)
'00000101'

--
Ivan
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castironpi at gmail

May 7, 2008, 5:05 PM

Post #7 of 7 (3364 views)
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Re: howto print binary number [In reply to]

On May 7, 4:03 pm, Joel Bender <j...@cornell.edu> wrote:
> > Python 3.0 has such a formatting operation, but Python 2.x does not.
> > However it's not hard to write.
>
> Indeed. Refraining from using named lambdas:
>
> >>> def bin(x):
> ... return ''.join(x & (1 << i) and '1' or '0' for i in
> ... range(7,-1,-1))
> ...
> >>> bin(12)
> '00001100'
> >>> bin(63)
> '00111111'
>
> It would be nice to have str(x, 2) like int(x, 2), but there are bigger
> fish in pond.

+1 str( x, base ) +1
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