howto print binary number

[dmitrey]

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

 

[Mensanator]

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.
01000010

 

[Gary Herron]

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

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

 

[Joel Bender]

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:
... return ''.join(x & (1 << i) and '1' or '0' for i in
... range(7,-1,-1))
... '00111111'

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


Joel

 

[Ivan Illarionov]

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)
'00000101'

 

[castironpi]

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