ModuleNotFoundError:在安装cython后安装pycocotools时没有名为“cython”的模块

Question

在用python 3.6.9在环境中安装pycocotools时，我遇到了问题。

我正在windows 10上运行ubuntu18.04，我创建了一个环境并激活了它。我想安装软件包，我使用：

pip install <package> --user

当我安装cython时，它工作得很好，但是，当我安装pycocotools时：

pip install pycocotools --user

我的错误如下：

Downloading https://files.pythonhosted.org/packages/96/84/9a07b1095fd8555ba3f3d519517c8743c2554a245f9476e5e39869f948d2/pycocotools-2.0.0.tar.gz (1.5MB)
100% |████████████████████████████████| 1.5MB 1.9MB/s
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/tmp/pip-build-mut7_bkf/pycocotools/setup.py", line 2, in <module>
    from Cython.Build import cythonize
ModuleNotFoundError: No module named 'Cython'

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-mut7_bkf/pycocotools/

我不理解这个错误，因为cython是在安装之前安装的，并且在安装过程中没有错误消息。

更新1

问题仍然存在，当我使用

python3 -m pip install 

但是我有件有趣的事。在活跃的环境中：

@ : python3 -m pip --version
@ : pip 9.0.1 from /env/lib/python3.6/site-packages (python 3.6)

@ : python3 -m pip install --upgrade pip --user
/env/share/python-wheels/urllib3-1.22-py2.py3-none-any.whl/urllib3/connectionpool.py:860: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
Collecting pip
/env/share/python-wheels/urllib3-1.22-py2.py3-none-any.whl/urllib3/connectionpool.py:860: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
/env/share/python-wheels/urllib3-1.22-py2.py3-none-any.whl/urllib3/connectionpool.py:860: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
Downloading https://files.pythonhosted.org/packages/54/0c/d01aa759fdc501a58f431eb594a17495f15b88da142ce14b5845662c13f3/pip-20.0.2-py2.py3-none-any.whl (1.4MB)
100% |████████████████████████████████| 1.4MB 1.6MB/s
Installing collected packages: pip
Successfully installed pip-20.0.2

@ : python3 -m pip --version
@ : pip 9.0.1 from /env/lib/python3.6/site-packages (python 3.6)

所以，这个包是正确下载和安装的，但是当我调用它时没有什么变化。我怀疑一个路径差异，但不知道如何解决它。

有人能帮我吗？

最好的

克里斯

Answer 1

正确的安装应该是这样的。

pip3 install Cython

pip3 install pycocotools

如果您使用conda环境

conda install -c anaconda cython

conda install -c conda-forge pycocotools
conda install -c conda-forge/label/gcc7 pycocotools     #choose one of these three
conda install -c conda-forge/label/cf201901 pycocotools

更新

如果上面的语句不起作用，这意味着您正在使用多个python版本。在安装这样的包时，可以指定您的python版本。

python3.6 -m pip install cython

如果您在执行这些步骤后发现任何错误，请将错误日志添加到您的问题中。