Convert text to decimal

convert_text_to_decimal.py

BITS = ('0', '1')
ASCII_BITS = 8

def bit_list_to_string(b):
    """converts list of {0, 1}* to string"""
    return ''.join([BITS[e] for e in b])

def seq_to_bits(seq):
    return [0 if b == '0' else 1 for b in seq]

def pad_bits(bits, pad):
    """pads seq with leading 0s up to length pad"""
    assert len(bits) <= pad
    return [0] * (pad - len(bits)) + bits

def convert_to_bits(n):
    """converts an integer `n` to bit array"""
    result = []
    if n == 0:
        return [0]
    while n > 0:
        result = [(n % 2)] + result
        n = n / 2
    return result

def string_to_bits(s):
    def chr_to_bit(c):
        return pad_bits(convert_to_bits(ord(c)), ASCII_BITS)
    return [b for group in
            map(chr_to_bit, s)
            for b in group]

def bits_to_char(b):
    assert len(b) == ASCII_BITS
    value = 0
    for e in b:
        value = (value * 2) + e
    return chr(value)

def list_to_string(p):
    return ''.join(p)

def bits_to_string(b):
    return ''.join([bits_to_char(b[i:i + ASCII_BITS])
        for i in range(0, len(b), ASCII_BITS)])

inputString = "attack at dawn"
numberOutput = int(bit_list_to_string(string_to_bits(inputString)),2) #1976620216402300889624482718775150

bitSeq = seq_to_bits(bin(numberOutput)[2:]) #[2:] is needed to get rid of 0b in front
paddedString = pad_bits(bitSeq,len(bitSeq) + (8 - (len(bitSeq) % 8))) #Need to pad because conversion from dec to bin throws away MSB's
outputString = bits_to_string(paddedString) #attack at dawn

hi everyone can someone pls help me with decrypting a file?