Python nested dict deep get utility method

readme.MD

Python dictionary utility method to get nested values

Supports nested dict, list within a dict

Usage Example:

data = {
  'name': 'Hassan',
  'detail': {
    'country': 'Pakistan',
    'hobbies': [
      'cricket',
      'gaming'
    ]
  }
}

print(dict_deep_get(data, 'name')) # Hassan
print(dict_deep_get(data, 'detail.country')) # Pakistan
print(dict_deep_get(data, 'detail.hobbies.1')) # gaming

print(dict_deep_get(data, 'detail.city')) # None
print(dict_deep_get(data, 'detail.hobbies.2', 'N/A')) # N/A

The time complexity of this function is O(n) where n is the number of iterations. Space complexity is O(1)

util.py

from functools import reduce

def dict_deep_get(dictionary, keys, default=None):
    return reduce(
        lambda d,
        key: d.get(
            key,
            default,
        ) if isinstance(d, dict) else d[int(key)] if isinstance(d, list) and len(d) > int(key) else default,
        keys.split("."),
        dictionary
    )