某个单词出现次数——python

# _*_ encoding:utf-8 _*_
import numpy as np
import re
text = input("请输入单词：")
a = re.findall('(s\w+o)',text)   
print(len(a))
m=collections.Counter(text)
print(m)

输出结果：

# _*_ encoding:utf-8 _*_
import numpy as np
import collections
text = input("请输入单词：")
m=collections.Counter(text)
print(m['s'])
print(len([i for i in text.split()]))

输出结果：

 

# _*_coding: utf-8 _*_
import numpy as np
inport re
class Counter:
 def __init__(self, path):
     self.mapping = dict()
     path = input("请输入单词：")
     words = [s.lower() for s in re.findall("\w+", path)]
     for word in words:
                self.mapping[word] = self.mapping.get(word, 0) + 1
 def most_common(self, n):
   assert n > 0, "n should be large than 0"
   return sorted(self.mapping.items(), key=lambda item: item[1], reverse=True)[:n]
if __name__ == '__main__':
  most_common_5 = Counter("path").most_common(5)
  for item in most_common_5:
    print(item)

 

还可以用遍历和正则表达式的方式来实现。