I'm trying to convert an iterator of tuples to an iterator of strings. I must use itertools, so I'm not allowed to use either for or while.
import itertools
def parlar_lloro(it0):
it1 = filter(lambda x: len(x)>=5, it0)
it2 = map(lambda x: x[:len(x)-2], it1)
it3, it4 = itertools.tee(it2, 2)
n = len(list(it3))
itn = itertools.repeat('CROA', n)
ite = zip(it4, itn)
return itr
What I get when executing this on Python's Shell is:
>>> [(abc,'CROA'),(def,'CROA'),(ghi,'CROA')]
And I want:
>>> ['abc','CROA','def','CROA','ghi','CROA']
CodePudding user response:
If you're suppose to be using itertools
then I suspect what you're expected to use is itertools.chain
...
Change your return to be (I'm guessing itr
is a typo and you meant ite
):
return itertools.chain.from_iterable(ite)
Just for reference, the same thing can be accomplished using a list-comp:
res = [sub for el in ((it[:-2], 'CROA') for it in x if len(it) >= 5) for sub in el]