String Concatenation

andy.py

from itertools import chain, islice
s1 = '4K Media'
s2 = '53 W. 23rd St.'
s3 = ''.join(chain(islice(filter(str.isalnum, s1), 4),
                   islice(filter(str.isalnum, s2), 8)))
assert s3 == '4KMe53W23rdS'

john.py

import string
s1 = '4K Media'
s2 = '53 W. 23rd St.'
f = (lambda s: [i for i in s if i not in string.printable[62:]])
s3 = [None]*(12)
s3[:4], s3[4: ] = f(s1)[:4], f(s2)[:8]
s3 = ''.join(s3)
assert s3 == '4KMe53W23rdS'

keerthi.py

s1 = '4K Media'
s2 = '53 W. 23rd St.'
ss1 = [i for i in s1 if i.isalnum()][:4]
ss2 = [i for i in s2 if i.isalnum()][:8]
s3 = "{}{}".format("".join(ss1), "".join(ss2))
assert s3 == '4KMe53W23rdS'