Question

用Python怎么统计一个列表的元素种类和各个种类的个数

Answer 1

举个例子吧，比如一个列表numbers=["cc","cc","ct","ct","ac"]。他的元素种类有3个（"cc","ct","ac"）,每个种类的个数分别为2，2，1

用python统计可以编写如下代码；

res = {}
for i in numbers:
res[i] = res.get(i, 0) + 1
print([k for k in res.keys()])
print([v for v in res.values()])