feat: add new_anime factory class method

Pipfile

@@ -11,3 +11,4 @@ twine = "*"
 sphinx = "*"
 sphinx-rtd-theme = "*"
 radon = "*"
+"flake8" = "*"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "f182f386e6ad648cfa47633b4e6b6e48511e18e06eb0f602c6d0b2c449e57ca7"
+            "sha256": "457dc98718285d0b6166dc6acec90e416c6578bc88d2ecc12337a38848c863f3"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -176,6 +176,7 @@
                 "sha256:859996073f341f2670741b51ec1e67a01da142831aa1fdc6242dbf88dffbe661",
                 "sha256:a796a115208f5c03b18f332f7c11729812c8c3ded6c46319c59b53efd3819da8"
             ],
+            "index": "pypi",
             "version": "==3.7.7"
         },
         "flake8-polyfill": {

anime_downloader/sites/anime.py

@@ -7,6 +7,7 @@ from bs4 import BeautifulSoup
 import os
 import logging
 import copy
+import importlib
 
 from anime_downloader.sites.exceptions import AnimeDLError, NotFoundError
 from anime_downloader import util
@@ -92,6 +93,24 @@ class Anime:
     def factory(cls, sitename: str):
         return cls.subclasses[sitename]
 
+    @classmethod
+    def new_anime(cls, sitename: str):
+        """
+        new_anime is a factory which returns the anime class corresposing to
+        `sitename`
+
+        Returns
+        -------
+        subclass of Anime
+        """
+        module = importlib.import_module(
+            'anime_downloader.sites.{}'.format(sitename)
+        )
+        for c in dir(module):
+            if issubclass(c, cls):
+                return c
+        raise ImportError("Cannot find subclass of {}".format(cls))
+
     def get_data(self):
         """
         get_data is called inside the :code:`__init__` of