関連ワード:  python count unique elements in a list    python count unique values in a list    python count distinct elements in list    python count unique values in list of dicts    python count elements in a list    python count of distinct values in a list    python count distinct items in list    python count number of unique elements in list    python count all unique values in list    python count all elements in a list  
結果 : python count unique elements in a list