myzip.py

def myzip(*seqs):
    seqs = [list(S) for S in seqs]
    res = []
    while all(seqs):
        res.append(tuple(x.pop(0) for x in seqs))
    return res


def mymapPad(*seqs, pad=None):
    seqs = [list(S) for S in seqs]
    res = []
    while any(seqs):
        res.append(tuple((S.pop(0) if S else pad) for S in seqs))
    return res

# Using Generator
def myzip(*seqs):
    seqs = [list(S) for S in seqs]
    while all(seqs):
        yield tuple(x.pop(0) for x in seqs)


def mymapPad(*seqs, pad=None):
    seqs = [list(S) for S in seqs]
    while any(seqs):
        yield tuple((S.pop(0) if S else pad) for S in seqs)

# Using min and max len
def myzip(*seqs):
    minlen = min(len(S) for S in seqs)
    return [tuple(S[i] for S in seqs) for i in range(minlen)]

def mymapPad(*seqs, pad=None):
    maxlen = max(len(S) for S in seqs)
    index = range(maxlen)
    return [tuple((S[i] if len(S) > i else pad) for S in seqs) for i in index]

# Using Generator
def myzip(*seqs):
    minlen = min(len(S) for S in seqs)
    return (tuple(S[i] for S in seqs) for i in range(minlen))

def mymapPad(*seqs, pad=None):
    maxlen = max(len(S) for S in seqs)
    index = range(maxlen)
    return (tuple((S[i] if len(S) > i else pad) for S in seqs) for i in index)

# Clever implementation from python manual
def myzip(*seqs):
    iters = list(map(iter, seqs))
    while iters:
        res = [next(i) for i in iters]
        yield tuple(res)

S1, S2 = 'abc', 'xyz123'
print(myzip(S1, S2))
print(mymapPad(S1, S2))
print(mymapPad(S1, S2, pad=99))