[EMAIL PROTECTED] wrote:
>> But watch out if the lists aren't all the same length: zip won't pad out
>> any sequences, so it maynotbe exactly what is wanted here:
>>
>> >>> x = ['1', '2', '3']
>> >>> y = ['4', '5']
>> >>> for row in zip(x,y):
>>
>> print ', '.join(row)
>>
>> 1, 4
>> 2, 5
>>
>
> Unfortunately the lists will be of different sizes
In that case use:
from itertools import repeat, chain, izip
def izip_longest(*args, **kwds):
fillvalue = kwds.get('fillvalue')
def sentinel(counter = ([fillvalue]*(len(args)-1)).pop):
yield counter() # yields the fillvalue, or raises IndexError
fillers = repeat(fillvalue)
iters = [chain(it, sentinel(), fillers) for it in args]
try:
for tup in izip(*iters):
yield tup
except IndexError:
pass
x = ['1', '2', '3']
y = ['4', '5']
for row in izip_longest(x,y, fillvalue='*'):
print ', '.join(row)
which gives:
1, 4
2, 5
3, *
(izip_longest is in a future version of itertools, but for
now you have to define it yourself).
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