如何将这个包含字典的列表拆分成单独的列？

def split_dict_list(dict_list):
    # Step 1: Get all keys from dictionaries
    keys = set()
    for dictionary in dict_list:
        keys.update(dictionary.keys())

    # Step 2: Create separate columns
    columns = {}
    for key in keys:
        column = []
        for dictionary in dict_list:
            if key in dictionary:
                column.append(dictionary[key])
            else:
                column.append(None)  # or other default value
        columns[key] = column

    return columns

# Example usage
dict_list = [
    {'name': 'John', 'age': 25, 'city': 'New York'},
    {'name': 'Alice', 'age': 30, 'city': 'San Francisco'},
    {'name': 'Bob', 'age': 35, 'country': 'Canada'}
]

result = split_dict_list(dict_list)
print(result)

{
    'name': ['John', 'Alice', 'Bob'],
    'age': [25, 30, 35],
    'city': ['New York', 'San Francisco', None],
    'country': [None, None, 'Canada']
}