Python - Convert Dictionary to Concatenated String

Python – Convert Dictionary to Concatenated String

Last Updated : 10 May, 2020

Sometimes, while working with Dictionaries, we can have a task in which we need to perform the conversion of converting dictionary to string, which is concatenated key-value pair. This can have application in domains in which we require to reduce storage space or require strings as target data. Lets discuss certain ways in which this task can be performed.

Method #1 : Using join() + items()
The combination of above functions can be used to solve this problem. In this, we need to perform the task of concatenation using join() and extraction of dictionary items is done using items().

# Python3 code to demonstrate working of 
# Convert Dictionary to Concatenated String
# Using join() + items()
  
# initializing dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Convert Dictionary to Concatenated String
# Using join() + items()
res = ''.join(key + str(val) for key, val in test_dict.items())
  
# printing result 
print("The dictionary after concatenation is : " + str(res)) 

Output :

The original dictionary is : {'gfg': 1, 'best': 3, 'is': 2}
The dictionary after concatenation is : gfg1best3is2

Method #2 : Using reduce() + lambda
The combination of above functions can be used to perform this task. In this, we perform the task of concatenation using combination of reduce() and lambda.

# Python3 code to demonstrate working of 
# Convert Dictionary to Concatenated String
# Using reduce() + lambda
from functools import reduce
  
# initializing dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Convert Dictionary to Concatenated String
# Using reduce() + lambda
res = reduce(lambda key, val : key + str(val[0]) + str(val[1]), test_dict.items(), '')
  
# printing result 
print("The dictionary after concatenation is : " + str(res)) 

Output :

The original dictionary is : {'gfg': 1, 'best': 3, 'is': 2}
The dictionary after concatenation is : gfg1best3is2

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