Add 'from' to except (#503)

Author: ki4070ma

appium/webdriver/appium_service.py

@@ -104,7 +104,7 @@ def _get_main_script(self) -> Union[str, bytes]:
                          '-e',
                          'console.log(require.resolve("{}"))'.format(MAIN_SCRIPT_PATH)]).strip()
                 except sp.CalledProcessError as e:
-                    raise AppiumServiceError(e.output)
+                    raise AppiumServiceError(e.output) from e
         return self._main_script
 
     @staticmethod

appium/webdriver/errorhandler.py

@@ -26,6 +26,6 @@ def check_response(self, response: Dict) -> None:
             super().check_response(response)
         except WebDriverException as wde:
             if wde.msg == 'No such context found.':
-                raise NoSuchContextException(wde.msg, wde.screen, wde.stacktrace)
+                raise NoSuchContextException(wde.msg, wde.screen, wde.stacktrace) from wde
             else:
                 raise wde

appium/webdriver/extensions/remote_fs.py

@@ -73,9 +73,9 @@ def push_file(self, destination_path: str,
             try:
                 with open(source_path, 'rb') as f:
                     file_data = f.read()
-            except IOError:
+            except IOError as e:
                 message = f'source_path "{source_path}" could not be found. Are you sure the file exists?'
-                raise InvalidArgumentException(message)
+                raise InvalidArgumentException(message) from e
             base64data = base64.b64encode(file_data).decode('utf-8')
 
         data = {