Class MissingPythonDependencyError

source code

                  object --+            
                           |            
    exceptions.BaseException --+        
                               |        
            exceptions.Exception --+    
                                   |    
      MissingExternalDependencyError --+
                                       |
              object --+               |
                       |               |
exceptions.BaseException --+           |
                           |           |
        exceptions.Exception --+       |
                               |       |
        exceptions.StandardError --+   |
                                   |   |
              exceptions.ImportError --+
                                       |
                                      MissingPythonDependencyError

Missing an external python dependency (subclass of ImportError).

Used for missing Python modules (rather than just a typical ImportError). Important for our unit tests to allow skipping tests with missing external python dependencies, while also allowing the exception to be caught as an ImportError.