With value to find the matching key:

# function to return key for any value 
def get_key(my_dict, val): 
    for key, value in my_dict.items(): 
         if val in value: # when your value is a list
         # if val == value: # when your value is a string
             return key 

    return "key doesn't exist"

Source:
https://www.geeksforgeeks.org/python-get-key-from-value-in-dictionary/