work by strings and list in python

Question

I have 5 set of lists and some of strings in those lists are repetitive

now! I wanna know the number of repetition! for example the word "A" is in all of my lists by "B" is just in "3" or "C" is in 4 of them.

How can I sort this problem, by using remove() I faced to wrong answer

Thank you in advance!

Have you tried collections Counter? Can you provide your current datastructure and your expected result? — What, Apr 26 '18 at 20:38
The second-top-voted answer on the linked duplicate shows how to use `collections.Counter` in an idiomatic way. — Andras Deak -- Слава Україні, Apr 26 '18 at 20:52
Your question is unclear. Please give an [MCVE](https://stackoverflow.com/help/mcve) and see [how to ask](https://stackoverflow.com/help/how-to-ask) — roganjosh, Apr 26 '18 at 21:03

W Stokvis · Accepted Answer · 2018-04-26T20:56:12.547

-2

Take a look at Counter

from collections import Counter
a = ['a','a','b','b']
b = ['b','b','c','d']
c = a+b
cnt = Counter()
for x in c:
     cnt[x] +=1

print(cnt)
    Counter({'a': 2, 'b': 4, 'c': 1, 'd': 1})

The above will get you counts of each but it seems like you're more concerned at a list level.

from collections import defaultdict
f = defaultdict(list)
a = ['a','a','b','b']
b = ['b','b','c','d']
c = ['e','f','g','h']
d = a + b + c
 for i in d:
     f[i] = 0
     if i in b:
         f[i] += 1
     if i in c:
         f[i] +=1
     if i in a:
         f[i] +=1
print (f)

defaultdict(list,
                {'a': 1, 'b': 2, 'c': 1, 'd': 1, 'e': 1, 'f': 1, 'g': 1, 'h': 1})

edited Apr 26 '18 at 20:56

answered Apr 26 '18 at 20:46

W Stokvis

1,409
8
15

5

This is a very good example of how not to use `Counter`. – Andras Deak -- Слава Україні Apr 26 '18 at 20:51
Why bother at all with `Counter` if you're going to use it like a defaultdict? The point of it is to be able to write `Counter(a+b)`. – Apr 26 '18 at 20:56
1

The edited-in second code snippet is inaccurate (and quite verbose) as well. – Apr 26 '18 at 20:57
1

YES! it was useful! THANK YOU – Erfan Apr 27 '18 at 23:05

work by strings and list in python

1 Answers1