trick

xiami.py

'''A simple script for extracting xiami song url.'''

try:
    from urllib import unquote
except ImportError:
    from urllib.parse import unquote


def decode(location):
    encoded = location[1:]
    total_chars = len(encoded)
    col = int(location[0])
    row, remains = int(float(total_chars) / col), total_chars % col

    address = ['' * col] * total_chars
    sizes = [row + 1] * remains + [row] * (col - remains)

    pos = 0
    for i, size in enumerate(sizes):
        for index in range(size):
            if pos + index < total_chars:
                address[col * index + i] = encoded[pos + index]
        pos = pos + size

    join = lambda x: ''.join(x)
    return unquote(join(map(join, address))).replace('^', '0')


location = ('7h%5xo4%2_lFe4d9a9355t2.im%2F9.ay116757EEtFfa%2F15mu'
            '%bb6b44%-p%im2F929pt3fb4b435n%2liF29393hDbb6%-6Eu3Fe.'
            '22243%_ec2d518-lAm.c24%5_3k7fdbE4%%l')
print(decode(location))