Write a binary integer or string to a file in python

Question

I have a string (it could be an integer too) in Python and I want to write it to a file. It contains only ones and zeros I want that pattern of ones and zeros to be written

Answer 1

I want that pattern of ones and zeros to be written to a file.

If you mean you want to write a bitstream from a string to a file, you'll need something like this...

from cStringIO import StringIO

s = "001011010110000010010"
sio = StringIO(s)

f = open('outfile', 'wb')

while 1:
    # Grab the next 8 bits
    b = sio.read(8)

    # Bail if we hit EOF
    if not b:
        break

    # If we got fewer than 8 bits, pad with zeroes on the right
    if len(b) < 8:
        b = b + '0' * (8 - len(b))

    # Convert to int
    i = int(b, 2)

    # Convert to char
    c = chr(i)

    # Write
    f.write(c)

f.close()

...for which xxd -b outfile shows...

0000000: 00101101 01100000 10010000                             -`.