将 Polars 转换为 Pandas 会在导入 lib 时引发错误 DLL 加载失败

Question

我正在使用 Polars 练习 Python。我有一个数据框，我在数据框中生成了一堆计算，然后想将其转换为 Pandas 数据框，以便我可以将隔离森林应用于数据集。我已经安装了 Polars、pyarrow 和 pandas 使用

我的代码和软件包版本如下。我有 Windows 作为我的操作系统

# Name                    Version                   Build  Channel
pandas                    1.5.3           py310h1c4a608_1    https://conda.anaconda.org/conda-forge
pandas-flavor             0.6.0              pyhd8ed1ab_1    https://conda.anaconda.org/conda-forge
polars                    0.20.5                   pypi_0    pypi
pyarrow                   10.0.1                   pypi_0    pypi
pyarrow-hotfix            0.6                pyhd8ed1ab_0    https://conda.anaconda.org/conda-forge

# ADD OUTLIER COLUMNS---------------------------------------------------------
# Using Isolation Forests to find outliers
from sklearn.ensemble import IsolationForest
import pandas as pd
import polars as pl
features = df_calc.drop('status')
features.to_pandas()

ImportError: DLL load failed while importing lib: The specified module could not be found.

有人可以帮忙吗？

Answer 1

我也遇到了同样的问题。我使用 Anaconda/Jupyter Notebook，通常使用 !{sys.executable} -mpip install 命令从 Notebook 中安装软件包。所以我尝试了这个：

！{sys.executable} -mpip install pyarrow

Requirement already satisfied: pyarrow in c:\users\user\anaconda3\lib\site-packages (14.0.2)

Requirement already satisfied: numpy>=1.16.6 in c:\users\user\anaconda3\lib\site-packages (from pyarrow) (1.26.3)

但是并没有解决问题。然后我尝试了这个（注意“-U”参数）：

！{sys.executable} -mpip install -U pyarrow

Requirement already satisfied: pyarrow in c:\users\user\anaconda3\lib\site-packages (14.0.2)

Collecting pyarrow

  Downloading pyarrow-15.0.0-cp39-cp39-win_amd64.whl.metadata (3.1 kB)

Requirement already satisfied: numpy<2,>=1.16.6 in c:\users\user\anaconda3\lib\site-packages (from pyarrow) (1.26.3)

Downloading pyarrow-15.0.0-cp39-cp39-win_amd64.whl (24.9 MB)

   ---------------------------------------- 0.0/24.9 MB ? eta -:--:--

[...]

   ---------------------------------------- 24.9/24.9 MB 22.6 MB/s eta 0:00:00

Installing collected packages: pyarrow

  Attempting uninstall: pyarrow

    Found existing installation: pyarrow 14.0.2

    Uninstalling pyarrow-14.0.2:

      Successfully uninstalled pyarrow-14.0.2

Successfully installed pyarrow-15.0.0

\

这对我有用。祝你好运！

贝尔帕