python - 将 df 保存和检索为 .csv，而不丢失类型信息

Question

当我将 pandas.DataFrame 保存到 .csv 文件时，一列 dicts 会转换为文字字符串。如何将 df 保存/加载到 .csv 以使它们等效？我了解pickle、hdf5等；我想让它保持人类可读，但如果这是错误的树，我愿意接受替代方案......

df = pd.DataFrame.from_items([('A', [1, 2, {3:30}]), ('B', [4, 5, {6:60}])],
 orient='index', columns=['one', 'two', 'three'])

df.to_csv('test.csv', sep='\t')
df_loaded = pd.read_csv('test.csv', sep='\t', index_col=0)
df == df_loaded

"""
output:

    one   two  three
A  True  True  False
B  True  True  False
"""

Answer 1

尝试pandas.DataFrame.to_json() :

测试代码:

import pandas as pd
df = pd.DataFrame.from_items(
    [('A', [1, 2, {3: 30}]), ('B', [4, 5, {6: 60}])],
    orient='index', columns=['one', 'two', 'three'])

df.to_json('test.csv')
print(pd.read_json('test.csv'))

结果:

   one      three  two
A    1  {'3': 30}    2
B    4  {'6': 60}    5