Python: Apply function to values in nested dictionary

Question

I have an arbitrarily deep set of nested dictionary:

x = {\'a\': 1, \'b\': {\'c\': 6, \'d\': 7, \'g\': {\'h\': 3, \'i\': 9}}, \'e\': {\'f\': 3}}

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Answer 1

If you need it to work for both lists and dicts in arbitrary nesting:

def apply_recursive(func, obj):
    if isinstance(obj, dict):  # if dict, apply to each key
        return {k: apply_recursive(func, v) for k, v in obj.items()}
    elif isinstance(obj, list):  # if list, apply to each element
        return [apply_recursive(func, elem) for elem in obj]
    else:
        return func(obj)