从字典列表创建数据框

Question

请帮助我根据词典列表创建数据框

Dataset = [{'A': ' X1'}, {'B': ' Y1'}, {'A': ' X2'}, {'B': ' Y2'}, {'A': ' X3'}, {'B': ' Y3'}, {'C': ' Z3'}]

输出应为：

Answer 1

您可以使用defaultdict和熊猫的from_dict方法。诀窍是使用orient参数并转置数据框以处理C列中的缺失值

def cast_to_dataframe(_ds):
    """
    Cast the given list of dictionaries to one dataframe

    :param _ds: List of dictionaries
    :return: DataFrame
    """

    final_dict = defaultdict(list)

    # Iterate through each dictionary in _ds
    for d in _ds:
        for key, value in d.items():
            final_dict[key].append(value)
    # Cast back to dict
    final_dict = dict(final_dict)
    df = pd.DataFrame.from_dict(final_dict, orient='index')

    return df.transpose()

dataset = [{'A': ' X1'}, {'B': ' Y1'}, {'A': ' X2'}, {'B': ' Y2'}, {'A': ' X3'}, {'B': ' Y3'}, {'C': ' Z3'}]

cast_to_dataframe(dataset)