Python - 连接动态频率

给定元素列表，动态执行频率连接，即每个元素与其频率连接，直到其索引。

Input : test_list = [‘z’, ‘z’, ‘e’, ‘f’, ‘f’]
Output : [‘1z’, ‘2z’, ‘1e’, ‘1f’, ‘2f’]
Explanation : As occurrence increase, concat number is increased.

Input : test_list = [‘g’, ‘f’, ‘g’]
Output : [‘1g’, ‘1f’, ‘2g’]
Explanation : As occurrence increase, concat number is increased.

方法：使用 defaultdict() + “+”运算符+ str()

在这种情况下，动态频率计算是使用 defaultdict() 完成的，而 str() 用于使用“+”运算符将元素转换为字符串以进行有效连接。

Python3

# Python3 code to demonstrate working of 
# Concatenate Dynamic Frequency
# Using defaultdict() + "+" operator + str()
from collections import defaultdict
  
# initializing list
test_list = ['z', 'z', 'e', 'f', 'f', 'e', 'f', 'z', 'c']
  
# printing original list
print("The original list is : " + str(test_list))
  
memo = defaultdict(int)
res = []
for ele in test_list:
    memo[ele] += 1
      
    # adding Frequency with element
    res.append(str(memo[ele]) + str(ele))
  
# printing result 
print("Dynamic Frequency list : " + str(res))

输出

The original list is : ['z', 'z', 'e', 'f', 'f', 'e', 'f', 'z', 'c']
Dynamic Frequency list : ['1z', '2z', '1e', '1f', '2f', '2e', '3f', '3z', '1c']