Always try "python setup.py install" as a fallback

Author: agronholm

readthedocs/doc_builder/python_environments.py

@@ -48,7 +48,6 @@ def delete_existing_build_dir(self):
 
     def install_package(self):
         if self.config.install_project:
-            setup_path = os.path.join(self.checkout_path, 'setup.py')
             if self.config.pip_install or getattr(settings, 'USE_PIP_INSTALL', False):
                 extra_req_param = ''
                 if self.config.extra_requirements:
@@ -65,7 +64,7 @@ def install_package(self):
                     cwd=self.checkout_path,
                     bin_path=self.venv_bin()
                 )
-            elif os.path.isfile(setup_path):
+            else:
                 self.build_env.run(
                     'python',
                     'setup.py',