change integer number to roman numeral

integer_to_roman.py

dict = {
    '1'    : 'I',
    '5'    : 'V',
    '10'   : 'X',
    '50'   : 'L',
    '100'  : 'C',
    '500'  : 'D',
    '1000' : 'M',
}
def g(n):
    if n == 0:  pass
    if n == 5:  return dict['5']
    if n == 9:  return dict['1'] + dict['10']
    if n < 4:
        result = ''
        for i in range(n):
            result += dict['1']
        return result
    if n == 4: return dict['1'] + dict['5']
    if n < 9:
        result = 'V'
        n = n - 5
        for i in range(n):
            result += dict['1']
        return result
def s(n):
    if n == 0:  pass
    if n == 1:  return dict['10']
    if n == 5:  return dict['50']
    if n == 4:  return dict['10'] + dict['50']
    if n == 9:  return dict['10'] + dict['100']
    if n < 5:
        result = ''
        for i in range(n):
            result += dict['10']
        return result
    if n < 10:
        result = 'L'
        n = n - 5
        for i in range(n):
            result += dict['10']
        return result
def b(n):
    if n == 0:  pass
    if n == 1:  return dict['100']
    if n == 5:  return dict['500']
    if n == 4:  return dict['100'] + dict['500']
    if n == 9:  return dict['100'] + dict['1000']
    if n < 5:
        result = ''
        for i in range(n):
            result += dict['100']
        return result
    if n < 10:
        result = 'L'
        n = n - 5
        for i in range(n):
            result += dict['100']
        return result
def q(n):
    if n > 3:   return 'Out of Range...'
    if n == 0:  pass
    if n == 1:  return dict['1000']
    if n < 4:
        result = ''
        for i in range(n):
            result += dict['1000']
        return result
    if n < 10:
        result = 'L'
        n = n - 5
        for i in range(n):
            result += dict['1000']
        return result
if __name__ == '__main__':
    number = input('Please input Integer to Roman numerals: ')
    if len(number) == 1: g(int(number))
    if len(number) == 2:
        sn, gn = number
        print(s(int(sn)) + g(int(gn)))
    if len(number) == 3:
        bn, sn, gn = number
        print(b(int(bn)) + s(int(sn)) + g(int(gn)))
    if len(number) == 4:
        qn, bn, sn, gn = number
        print(q(int(qn)) + b(int(bn)) + s(int(sn)) + g(int(gn)))
'''
简直屈辱，我好笨啊~   居然写了接近快100行！！！  丢死人啦！！！！  去看大牛们的思路，争取用最简洁的方式写出来！
'''