python 列表元素统计出现的次数并输出字典

 

import collections  
my_list = [10,10,10,10,20,20,20,20,40,40,50,50,30]  
print("Original List : ",my_list)  
ctr = collections.Counter(my_list)  
print("Frequency of the elements in the List : ",dict(ctr))