Error in an accepted answer: 'list' object is not callable-CodePudding

In another topic, there is this problem I am trying to solve. There is a very detailed answer which for some reason does not work for me and gives

TypeError: 'list' object is not callable

df=

index       sale_id      item
33337606    02234563    389699
29350189    02234520    230153
5002610     02234403    P79927
3357151     02235866    I25240
29351311    02234520    230155
...         ...         ...

grp = df.groupby('sale_id')['item'].agg(lambda x: ''.join(x))
purchases = grp.apply(lambda x: ''.join(x)).unique()
unique_items = df.item.unique()
res = {}
for c in combinations(unique_items, 2):
    c = set(c)
    res[frozenset(c)] = 0
    for i in purchases:
        if c.intersection(i) == c:
            res[frozenset(c)]  = 1
for k, v in res.items():
    res[k] = v / purchases.shape[0]
res

CodePudding user response：

My bad completely, sorry guys. I had not imported combinations.

from itertools import combinations