import pandas as pd
df = pd.read_csv('music_log_upd.csv')

genre_grouping = df.groupby('user_id')['genre_name']


def user_genres(group):
    result = []
    for col in (group):
        user = col[0]
        if len(col[1]) > 50:
            result.append(user)
    return result
search_id = user_genres(genre_grouping)
print(search_id)