如何创建collections.Counter列表？

Question

I have a for loop and each time I call a function within each iteration, and the return of that functions is from type " collections.Counter ", and I would like at the end of the loop that lst will contain all collection.Counter

for gram in range(0, nGram):
   lst[gram]=getCollection(gram)

Answer 1

For a list , you need to use .append() :

for gram in range(nGram):
   lst.append(getCollection(gram))

You can turn that into a list comprehension:

lst = [getCollection(gram) for gram in range(nGram)]

Answer 2

您可以按照其他人的建议使用列表的append方法，也可以在此处简单地使用列表理解

lst = [getCollection(gram) for gram in range(nGram)]

Answer 3

Try to append it:

lst.append(getCollection(gram))

Otherwise (if gram is not a valid index of the list) you will end up with an IndexError, telling you that the list does not have that many elements—yet.