There is a Pandas dataframe: id title rating 0 Pulp Fiction (1994) 5.0 1 Three Colors: Red (Trois couleurs: Rouge) (1994) 3.5 2 Three Colors: Blue (Trois couleurs: Bleu) (1993) 5.0 3 Underground (1995) 5.0 4 Singin' in the Rain (1952) 3.5 5 Dirty Dancing (1987) 4.0 6 Delicatessen (1991) 3.5 7 Ran (1985) 3.5 8 Seventh Seal, The (Sjunde inseglet, Det) (1957) 5.0 9 Bridge on the River Kwai, The (1957) 4.0 in this dataframe the names of films are not unique, because the same film may have been given different ratings Your task is to write a function that calculates the average rating of each movie and removes non-unique strings

def avgrating(df):
    #your code here
    return df