input: Write a python function to find the most frequent value in a list.
  assert most_frequent_value([1, 3, 2, 3, 4, 5, 3]) == 3
  assert most_frequent_value([1, 1, 2, 2, 2, 3, 1]) == 2
  assert most_frequent_value([5, 5, 5, 6, 6, 7, 7, 5]) == 5
output: def most_frequent_value(lst):
      from collections import Counter
      return Counter(lst).most_common(1)[0][0]