title: error when importing cartopy: ModuleNotFoundError: No module named 'cartopy._crs'
body: <p>I am trying to import the cartorpy package (version -0.18.0) for python and keep running into problems.</p>
  <pre><code>from cartopy import config
  
  import cartopy.crs as ccrs
  </code></pre>
  <p>I get the error:</p>
  <pre><code>Traceback (most recent call last):
    File &quot;c:\Users\Admin\Downloads\advanced_plotting-1.py&quot;, line 6, in &lt;module&gt;
      from cartopy import config
    File &quot;C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\cartopy\__init__.py&quot;, line 104, in &lt;module&gt;
      import cartopy.crs
    File &quot;C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\cartopy\crs.py&quot;, line 22, in &lt;module&gt;
      from cartopy._crs import (CRS, Geodetic, Globe, PROJ4_VERSION,
  ModuleNotFoundError: No module named 'cartopy._crs'
  </code></pre>
  <p>what I think is happening is when it is importing the function it is looking for cartopy._crs that does not exist. When looking on the packages git hub <a href="https://github.com/SciTools/cartopy" rel="nofollow noreferrer">https://github.com/SciTools/cartopy</a> I still can not make sense of where it is trying to point.</p>
  <p>any suggestions on how to get this package to import successfully would be appreciated.</p>