如何替换对象中的特定字符串？

def replace_string_in_object(obj, target_str, replacement_str):
    if isinstance(obj, dict):
        for key, value in obj.items():
            if isinstance(value, str):
                obj[key] = value.replace(target_str, replacement_str)
            elif isinstance(value, (dict, list)):
                replace_string_in_object(value, target_str, replacement_str)
    elif isinstance(obj, list):
        for item in obj:
            replace_string_in_object(item, target_str, replacement_str)

# 示例用法
data = {
    "name": "John",
    "address": "123 Main Street",
    "phone_numbers": ["123-456-7890", "555-555-5555"],
    "email": "john@example.com"
}

replace_string_in_object(data, "John", "Jane")
replace_string_in_object(data, "555-555-5555", "999-999-9999")

print(data)