how to count the total number of items for the lists contain a specific item in python -

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i want count total items lists contain 'a', should 4+3 = 7

tweetword = (['a','b','c','a'],['a','e','f'],['d','g']) count_total_a = {} t in tweetword:     word in tweetword:         if word not in count_total_a:             count_toal_a[word] = len(t)         if word in count_total_a:             count_total_a[word] += len(t) '''the result not correct coz counts first list twice'''

really appreciate help!

take sum on generator:

sum(len(x) x in tweetword if 'a' in x)

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