# coding:utf-8__author__ = 'hdfs'from math import sqrtusers = {    "Angelica": {"Blues Traveler": 3.5, "Broken Bells": 2.0, "Norah Jones": 4.5, "Phoenix": 5.0,                 "Slightly Stoopid": 1.5,                 "The Strokes": 2.5, "Vampire Weekend": 2.0},    "Hailey": {"Broken Bells": 4.0, "Deadmau5": 1.0, "Norah Jones": 4.0, "The Strokes": 4.0, "Vampire Weekend": 1.0},    "Jordyn": {"Broken Bells": 4.5, "Deadmau5": 4.0, "Norah Jones": 5.0, "Phoenix": 5.0, "Slightly Stoopid": 4.5,               "The Strokes": 4.0, "Vampire Weekend": 4.0},    "Sam": {"Blues Traveler": 5.0, "Broken Bells": 2.0, "Norah Jones": 3.0, "Phoenix": 5.0, "Slightly Stoopid": 4.0,            "The Strokes": 5.0},    "Veronica": {"Blues Traveler": 3.0, "Norah Jones": 5.0, "Phoenix": 4.0, "Slightly Stoopid": 2.5, "The Strokes": 3.0}}def coscoefficient(rating1, rating2):    '''    余弦相识度    :param rating1:     :param rating2:     :return:    '''    xleng, yleng = 0, 0    for ratval01key, ratval01 in rating1.items():        xleng = xleng + ratval01 * ratval01    for ratval02key, ratval02 in rating2.items():        yleng = yleng + ratval02 * ratval02    neiji = 0    for key1 in rating1.keys():        if key1 in rating2.keys():            neiji = neiji + rating1[key1] * rating2[key1]    result = neiji / (sqrt(xleng) * sqrt(yleng))    return resultif __name__ == "__main__":    print(coscoefficient(users['Angelica'], users['Veronica']))