Python Calculation of length of songs

define total_length(songs_dictionary, artist)

Key of each item in songs_dictionary is the artist name and the valume with number which shows the length of the songs in seconds.

We can assume that the parameter dictionary is not empty and the parameter exists.

Example)

s_dict = {'Singer A': [('AA', 200), ('BB', 350), ('CC', 450)], 'Singer B': [('DD', 140), ('EE', 165), ('FF', 290)]}

print{total_length(s_dict, 'Singer A'))

Result : 1000