Recursively Capitalize Keys - Python

capitalize_keys.py

def capitalize_keys(d):
    for k, v in d.copy().items():
        if isinstance(v, dict):
            d.pop(k)
            d[f"{k[0].upper() +k[1:]}"] = v
            capitalize_keys(v)
        else:
            d.pop(k)
            d[f"{k[0].upper() +k[1:]}"] = v
    return d