python bitarray to and from file
Question: I'm writing a large bitarray to a file using this code:

    
    
    import bitarray
    bits = bitarray.bitarray(bin='0000011111') #just an example
    
    with open('somefile.bin', 'wb') as fh:
        bits.tofile(fh)
    

However, when i attempt to read this data back using:

    
    
    import bitarray
    a = bitarray.bitarray()
    with open('somefile.bin', 'rb') as fh:
        bits = a.fromfile(fh)
        print bits
    

it fails with 'bits' being a NoneType. What am i doing wrong?


Answer: I think "a" is what you want. a.fromfile(fh) is a method which fills a with
the contents of fh: it doesn't return a bitarray.

    
    
    >>> import bitarray
    >>> bits = bitarray.bitarray('0000011111')
    >>> 
    >>> print bits
    bitarray('0000011111')
    >>> 
    >>> with open('somefile.bin', 'wb') as fh:
    ...     bits.tofile(fh)
    ... 
    >>> a = bitarray.bitarray()
    >>> with open('somefile.bin', 'rb') as fh:
    ...     a.fromfile(fh)
    ... 
    >>> print a
    bitarray('0000011111000000')
    

