Find the dictionary keys that are present in the list

Question

I am new to python object oriented programming. I am trying to solve a problem where I have to define a class, create a method, write the code inside it and then create a object and call that method. I am a little confused on how to go forward with it.

Example: {1:'A',2:'B} L: [1,2,3,4]

Find the dictionary keys that are present in the list (without using for loop)

Answer 1

Try this:

def match_keys(dct, lst):
    matches = list()
    
    for key in dct.keys():
        if key in lst:
            matches.append(key)
    
    return matches

Without for loop, you can use filter :

output = list(filter(lambda elem: elem in list(dct.keys()), lst))

Answer 2

Another simple approach can be to use intersection() :

my_dict = {1: 'A', 2: 'B'}
my_list = [1, 2, 3, 4]

output = set(my_dict).intersection(my_list)
print(output)