find_max.py

def find_max(my_list):
    my_set = set(my_list)
    my_dict = {}
    for item in my_set:
        my_dict[item] = my_list.count(item)
        
    my_max = max(my_dict.keys(), key=(lambda k: my_dict[k]))
    return my_max

tokenize_max.py

l = ['Apple', 'Orange', 'Banana', 'Peach', 'Peach']
s = set(l)
my_dict ={}
for j in s:
    my_dict[j] = l.count(j)
key_max = max(my_dict.keys(), key=(lambda k: my_dict[k]))

from collections import Counter
counter = Counter("here's a string") # or pass a list (or any iterable or mapping)
counter.most_common(1) # [('e', 2)]