<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _calculate_german_iban_checksum(iban, iban_fields='DEkkbbbbbbbbcccccccccc'):
 """ Calculate the checksam of the German IBAN format. Examples -------- '41' """

    number = [value
              for field_type, value in zip(iban_fields, iban)
              if field_type in ['b', 'c']]
    translate = {'0': '0', '1': '1', '2': '2', '3': '3', '4': '4', '5': '5',
                 '6': '6', '7': '7', '8': '8', '9': '9'}
    for i in range(ord('A'), ord('Z') + 1):
        translate[chr(i)] = str(i - ord('A') + 10)
    for val in 'DE00':
        translated = translate[val]
        for char in translated:
            number.append(char)
    number = sum(int(value) * 10**i for i, value in enumerate(number[::-1]))
    checksum = 98 - (number % 97)
    return str(checksum)