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]

On May 7, 3:13*pm, dmitrey <dmitrey.kros.. [e-mail] e:

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

[Gary Herron]

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

[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:

>>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

[Ivan Illarionov]

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','01 0','011','100', '101','110','11 1']
binstring = [oct2bin[int(n)] for n in oct(x)]
return ''.join(binstri ng).lstrip('0') .zfill(digits)

>>bin(5)

'101'

>>bin(0x0FFF, 16)

'00001111111111 11'

>>bin(5, 8)

'00000101'

--
Ivan

[castironpi]

On May 7, 4:03*pm, Joel Bender <j...@cornell.e duwrote:

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