IBAN code lengths

Question P4.3.4

The file iban_lengths.txt contains two columns of data: a two-letter country code and the length of that country's International Bank Account Number (IBAN):

AL 28
AD 24
GB 22

The code snippet below parses the file into a dictionary of lengths, keyed by the country code:

iban_lengths = {}
with open('iban_lengths.txt') as fi:
    for line in fi.readlines():
        fields = line.split()
        iban_lengths[fields[0]] = int(fields[1])

Use a lambda function and list comprehension to achieve the same goal in (a) two lines, (b) one line.

Solution P4.3.4