在列表中循环元组

Question

I want to make Morse code with Python, so I tried the following:

L = [(2, 1), (8, 4, 2, 1)]    
data = "00:1:02"
data = [(x[:1], x[1:]) for x in data.split(':') ]
for [a,b] in data:
    if b=="": b, a = a, '0'
    #print(a,b)

Now, I am looking for a simple way to loop trough the two tuples in the L list and separate them to make the a pass trough L[0] tuple and b pass though L[1] tuple.

Something like that in one for loop:

for A in l[0], B in l[1]:

#A to do somethings with a and 
#B to do something with b

I tried some combines but I didn't find the right syntax. Can any one offer any suggestions?

Answer 1

If you want to iterate over L[0] and L[1] at the same time you can use:

for a, b in itertools.izip_longest(L[0], L[1]):
    print a, b

The above will set a to None as L[1] is longer than L[0] and thus there are more values in L[1] to iterate over than in L[0] . This gives:

2 8
1 4
None 2
None 1