Keep in array of words just given words from another array

Question

Given an array:

 arr = ['a','b','c','d','a','b','d','f']

I would like to preprocess it with some kind of dictionary:

 dictionary = ['a','b','c']

so after: arr.preprocess(dictionary) all items not exisiting in dictionary will be deleted, arr will be now like:

['a','b','c','a','b']

Answer 1

[item for item in arr if item in dictionary]

Answer 2

Here is a possible solution:

arr = ['a','b','c','d','a','b','d','f']
dictionary = ['a','b','c']
arr = [x for x in arr if x in dictionary]

Answer 3

Verified Solution:

arr = ['a','b','c','d','a','b','d','f']
dictionary = ['a','b','c']
li = []
li = [element for element in arr if element in dictionary]
print(li)

Cheers