Training. Binary numbers to decimal.

b_to_d_training.py

# coding: utf-8
import random
import string

art = 'QlpoOTFBWSZTWX+fdicAABdXgH/9aOegb4oEgAiIBTABGIoaNFTwiZ' \
      'opnqjaGpo9qNIMZNMgZNDIMjTAjBIk1HpJPJDIHqaaAwTb/Hi1A36N' \
      'sY0QxDaDz7zqW11tpFWwp4mlvVzjatXcNnSgWbbQBPNQkIV85lqm2z' \
      'utGc42JYC2SrXjgQoDKzjSQjhGTJX2VemGAgoBWTnFfPwkcu+OEblH' \
      '9Xq1ebMV0ygs3CtkvFnhNkwCMoCO+pONKTI7TvvF1xWRdUhpHSURRd' \
      'eup4iy2XuLbbr73358vJGeRrwerjahCBn6VTtwSxBAEYMhjAwG0rkA' \
      'Vr2vhRVxGWSOjR1tPh2vjO0pFnAwnJswLyC+05Zq48LRgOU/AURkbE' \
      'Cv+LuSKcKEg/z7sTg='

from base64 import b64decode
from bz2 import decompress
print decompress(b64decode(art))


print '''
This program is for training to
understand numbers in other systems

Enter `quit` or `exit` to quit.
Enter `degree {num}` to set num of bits.

'''

def get_answer(pre='count: '):
    answer = None
    while answer is None:
        try:
            answer = raw_input(pre)
        except:
            print ''
            answer = None
    return answer


def get_settings():
    print "Chose system from (10 by default)"
    while True:
        num_from = get_answer()
        try:
            num_from = int(num_from)
            break
        except:
            print "What you mean?"

    print "Chose system to (2 by default)"
    while True:
        num_to = get_answer()
        try:
            num_to = int(num_to)
            break
        except:
            print "What you mean?"

    return num_from, num_to
def set_degree(a, degree):
    a = a.split(' ')
    if a[0].lower()=='degree' and len(a) > 1:
        try:
            degree = int(a[1])
        except:
            pass
    return degree

def main():
    # num_from, num_to = get_settings()
    degree = 8
    quit_commands = ['quit', 'exit']

    while True:
        num = random.randint(1, 2**(degree)-1)
        print '>>> %s' % string.zfill(bin(num)[2:], degree)
        answer = get_answer()
        if answer.lower() in quit_commands:
            break
        _degree = set_degree(answer, degree)
        if _degree != degree:
            degree = _degree
            continue
        try:
            answer = int(answer)
        except:
            answer = num-1
        if answer == num:
            print 'Great!\n'
        else:
            print 'Wrong. It\'s %s' % num


if __name__ == '__main__':
    main()