其实就是内存不够了，我加载的数据是800多万，数据量太大出错
下面试错误提示
C:UserssouwayaiMiniconda3python.exe D:/www/use_pandas/pd7.py
Traceback (most recent call last):
File "D:/www/use_pandas/pd7.py", line 14, in <module>
df = pd.DataFrame(list(chapters.find()))
File "C:UserssouwayaiMiniconda3libsite-packagespandascoreframe.py", line 369, in __init__
arrays, columns = _to_arrays(data, columns, dtype=dtype)
File "C:UserssouwayaiMiniconda3libsite-packagespandascoreframe.py", line 6254, in _to_arrays
coerce_float=coerce_float, dtype=dtype)
File "C:UserssouwayaiMiniconda3libsite-packagespandascoreframe.py", line 6375, in _list_of_dict_to_arrays
content = list(lib.dicts_to_array(data, list(columns)).T)
File "pandas\_libslib.pyx", line 441, in pandas._libs.lib.dicts_to_array
MemoryError