mc_a.py

"""
FIND MOST COMMON ELEMENT IN LIST

 - what is "most common"
 - restrictions
 - list properties
 - tests?
"""

def solution(items):
    """
    - time complexity
    - space complexity
    - issues / improvements
    """
    if not items:
        return

    counter = dict()
    best = None

    for item in items:
        if item in counter:
            counter[item] += 1
            if counter[item] > counter[item]:
                best = item
        else:
            counter[item] = 1

    if counter[best] > len(items) // 2:
        return best