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Combine similar characters in Python using Dictionary Get() Method

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  • Last Updated : 14 Apr, 2022
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Let us see how to combine similar characters in a list. 

Example :

Input : [‘g’, ‘e’, ‘e’, ‘k’, ‘s’, ‘f’, ‘o’, ‘r’, ‘g’, ‘e’, ‘e’, ‘k’, ‘s’] 

Output : [‘gg’, ‘eeee’, ‘kk’, ‘ss’, ‘f’, ‘o’, ‘r’]

We will be using the get() method of the dictionary class.

dictionary.get()

The get() method returns the value of the item with the specified key.

Syntax : dictionary.get(key name, value) 

Parameters :

  • keyname : The key name of the dictionary item.
  • value : (Optional) If the specified key does not exist, then a value is returned.

Returns : Value of the item with the specified key

Algorithm :

  1. Declare the list.
  2. Declare a dictionary.
  3. Iterate over the list, using the get() method, if a new key is found, then the value 0 is assigned to it and 1 is added making the final value 1. Else if the key is repeated, then 1 is added to the previously calculated value. So this way, now each key has a value assigned to it, and frequency of all characters is recorded.
  4. Separate all the keys and the values and store them in 2 different lists.
  5. Use the zip() function store the product of keys and their respective values in the result list.
  6. Display the result.

Example 1 : 

python3




# declaring the list of characters
mylist = ['g', 'e', 'e', 'k', 's', 'f',
          'o', 'r', 'g', 'e', 'e', 'k', 's']
 
# declaring the dictionary
dictionary = {}
 
# counting the frequency of the keys
for key in mylist:
    dictionary[key] = dictionary.get(key, 0) + 1
 
# storing the of keys and values
k = list(dictionary.keys())
v = list(dictionary.values())
 
# declaring the result list
result = []
 
# storing the product of keys and
# their respective values in result
for i, j in zip(k, v):
    result.append(i * j)
     
# displaying the result
print(result)

Output :

['gg', 'eeee', 'kk', 'ss', 'f', 'o', 'r']

Example 2 : 

python3




# declaring the list of characters
mylist = ['p', 'y', 't', 'h', 'o', 'n', 't',
          'u', 't', 'o', 'r', 'i', 'a', 'l']
 
# declaring the dictionary
dictionary = {}
 
# counting the frequency of the keys
for key in mylist:
    dictionary[key] = dictionary.get(key, 0) + 1
 
# storing the of keys and values
k = list(dictionary.keys())
v = list(dictionary.values())
 
# declaring the result list
result = []
 
# storing the product of keys and
# their respective values in result
for i, j in zip(k, v):
    result.append(i * j)
     
# displaying the result
print(result)

Output :

['a', 'h', 'i', 'l', 'n', 'oo', 'p', 'r', 'ttt', 'u', 'y']

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