python如何查询列表中不同元素个数？

#统计词频

colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']

result = {}

for color in colors:

    if result.get(color)==None:

        result[color]=1

    else:

        result[color]+=1

print (result)

#{'red': 2, 'blue': 3, 'green': 1}

from collections import Counter

colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']

c = Counter(colors)

print (dict(c))