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# Python – Group Hierarachy Splits of keys in Dictionary

• Last Updated : 09 May, 2021

Given a dictionary with keys joined by a split character, the task is to write a Python program to turn the dictionary into nested and grouped dictionaries.

Examples

Input: test_dict = {“1-3” : 2, “1-8” : 10}, splt_chr = “-“

Output: {‘1’: {‘3’: 2, ‘8’: 10}}

Explanation : 1 is linked to 3 with value 2 and 8 with value 10, hence those elements are nested and values assigned.

Input: test_dict = {“1-3” : 2, “8-7” : 0, “1-8” : 10, “8-6” : 15}, splt_chr = “-“

Output: {‘1’: {‘3’: 2, ‘8’: 10}, ‘8’: {‘7’: 0, ‘6’: 15}}

Explanation : 1 is linked to 3 with value 2 and 8 with value 10, similarly 8 is linked to 7 with value 0 and 6 with value 15, hence those elements are nested and values assigned.

### Method #1 : Using loop + split()

In this, we perform the task of splitting the keys for flattening using split(). And then memorization of keys is done using dictionary which adds to its nested dictionaries other similar nested keys found.

## Python3

 `# Python3 code to demonstrate working of``# Group Hierarachy Splits of keys in Dictionary``# Using loop + split()`` ` `# initializing dictionary``test_dict ``=` `{``"1-3"` `: ``2``, ``"8-7"` `: ``0``, ``"1-8"` `: ``10``, ``"8-6"` `: ``15``}``              ` `# printing original dictionary``print``(``"The original dictionary is : "` `+` `str``(test_dict))`` ` `# initializing split char ``splt_chr ``=` `"-"`` ` `res ``=` `dict``()``for` `key, val ``in` `test_dict.items():``    ``ini_key, low_key ``=` `key.split(splt_chr)``     ` `    ``# check if key already present``    ``if` `ini_key ``not` `in` `res:``        ``res[ini_key] ``=` `dict``()``     ` `    ``# add nested value if present key``    ``res[ini_key][low_key] ``=` `val`` ` `# printing result``print``(``"The splitted dictionary : "` `+` `str``(res))`
Output
```The original dictionary is : {'1-3': 2, '8-7': 0, '1-8': 10, '8-6': 15}
The splitted dictionary : {'1': {'3': 2, '8': 10}, '8': {'7': 0, '6': 15}}```

### Method #2 : Using defaultdict()

Similar to the above method, the Only difference being defaultdict() is used for the task of memorizing the grouping keys.

## Python3

 `# Python3 code to demonstrate working of``# Group Hierarachy Splits of keys in Dictionary``# Using defaultdict() ``from` `collections ``import` `defaultdict`` ` `# initializing dictionary``test_dict ``=` `{``"1-3"` `: ``2``, ``"8-7"` `: ``0``, ``"1-8"` `: ``10``, ``"8-6"` `: ``15``}``              ` `# printing original dictionary``print``(``"The original dictionary is : "` `+` `str``(test_dict))`` ` `# initializing split char ``splt_chr ``=` `"-"`` ` `res ``=` `defaultdict(``dict``)``for` `key, val ``in` `test_dict.items():``    ``ini_key, low_key ``=` `key.split(splt_chr)``     ` `    ``# defaultdict eliminates check step``    ``res[ini_key][low_key] ``=` `val`` ` `# printing result``print``(``"The splitted dictionary : "` `+` `str``(``dict``(res)))`
Output
```The original dictionary is : {'1-3': 2, '8-7': 0, '1-8': 10, '8-6': 15}
The splitted dictionary : {'1': {'3': 2, '8': 10}, '8': {'7': 0, '6': 15}}```

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