python 统计单词个数，并按个数与字母排序

# coding: utf-8
 
# In[1]:
 
import collections
 
str = "Be slow to promise and quick to perform"
# 按空格切割
str_split = str.split(' ')
 
# In[2]:
 
str_split
 
# Out[2]:
#['Be', 'slow', 'to', 'promise', 'and', 'quick', 'to', 'perform']
 
# In[3]:
 
# 统计每个单词的个数
temp_str = collections.Counter(str_split).most_common()
temp_str
 
# Out[3]:
# [('to', 2),
#  ('and', 1),
#  ('Be', 1),
#  ('slow', 1),
#  ('perform', 1),
#  ('promise', 1),
#  ('quick', 1)]
 
# In[4]:
 
# 排序方式用lambda ,先排个数，再按字母顺序排
sorted(temp_str, key = lambda x:[-x[1],x[0]])
 
# Out[4]：
# [('to', 2),
#  ('Be', 1),
#  ('and', 1),
#  ('perform', 1),
#  ('promise', 1),
#  ('quick', 1),
#  ('slow', 1)]