I\'m still getting used to Python conventions and using Pylint to make my code more Pythonic, but I\'m puzzled by the fact that Pylint doesn\'t like single character variable na
Pylint checks not only PEP8 recommendations. It has also its own recommendations, one of which is that a variable name should be descriptive and not too short.
You can use this to avoid such short names:
my_list.extend(x_values)
Or tweak Pylint's configuration to tell Pylint what variable name are good.