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Python – Append Multitype Values in Dictionary

  • Last Updated : 10 May, 2020

Sometimes, while working with Python dictionaries, we can have problem in which we need to update the dictionary values, according to the data type. This type of problem can have application in many domains which include data. Lets discuss a way in which this problem can be solved.

Input : test_dict = {‘gfg’ : “”, ‘is’ : {}, ‘best’ : []}
Output : {‘gfg’: ‘geeks’, ‘is’: {‘c’: 7}, ‘best’: [4, 5]}

Input : test_dict = {‘gfg’ : “123”, ‘is’ : {}, ‘best’ : [“geeks”]}
Output : {‘gfg’: ‘123geeks’, ‘is’: {‘c’: 7}, ‘best’: [‘geeks’, 4, 5]}

Method : Using isinstance() + update() + extend()
The combination of above functions can be used to perform this task. In this, we check for the data type of value using isinstance() and perform dictionary update using update(), list update using extend().




# Python3 code to demonstrate working of 
# Append Multitype Values in Dictionary
# Using isinstance() + update() + extend()
  
# helper_fnc
def update_dictionary(key, val, test_dict):
      
    if key not in test_dict:
        current_dict[key] = value 
      
    elif type(val) not in [str, list, dict]:
        raise ValueError("Invalid Data Type")
      
    elif isinstance(val, list):
        test_dict[key].extend(val)
      
    elif isinstance(val, dict):
        test_dict[key].update(val)
      
    else:
        test_dict[key] = test_dict[key] + val
      
    return test_dict
  
# initializing dictionary
test_dict = {'gfg' : "geekfor", 'is' : {'a' : 5, 'b' : 6}, 'best' : [1, 2, 3]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing dict, string and append
up_dict = {'c' : 7}
up_str = 'geeks'
up_list = [4, 5]
  
# Append Multitype Values in Dictionary
# Using isinstance() + update() + extend()
res = update_dictionary('gfg', up_str, test_dict)
res = update_dictionary('is', up_dict, res)
res = update_dictionary('best', up_list, res)
  
# printing result 
print("The update dictionary : " + str(res)) 
Output :



The original dictionary is : {‘is’: {‘b’: 6, ‘a’: 5}, ‘best’: [1, 2, 3], ‘gfg’: ‘geekfor’}
The update dictionary : {‘is’: {‘b’: 6, ‘a’: 5, ‘c’: 7}, ‘best’: [1, 2, 3, 4, 5], ‘gfg’: ‘geekforgeeks’}

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