update_paste_list and get_pastes_by_language return Paste objects

src/main.py

@@ -5,7 +5,7 @@ def main():
     pastebin = PastebinClient()
 
     # Fetch public paste list
-    pastebin.populate_pastes()
+    pastebin.update_paste_list()
 
     # Fetch full data from a few pastes to test methods
     pastebin.fetch_paste(0)
@@ -13,12 +13,12 @@ def main():
 
     # Test get_pastes_by_language
     py_pastes = pastebin.get_pastes_by_language("Python")
-    for i in py_pastes:
-        print(pastebin.pastes[i])
+    for paste in py_pastes:
+        print(paste)
 
     # Test if duplication is prevented by Paste.__hash__
     print(len(pastebin.pastes))
-    pastebin.populate_pastes()
+    pastebin.update_paste_list()
     print(len(pastebin.pastes))
 
 

src/pastebin/client.py

@@ -157,9 +157,14 @@ class PastebinClient(PastebinAPI):
         super().__init__(headers, proxies, debug)
         self.pastes = []
 
-    def populate_pastes(self):
-        pastes_catalog = set(self.get_public_paste_list())
-        self.pastes = list(set(self.pastes).union(pastes_catalog))
+    def update_paste_list(self):
+        fetched_pastes = set(self.get_public_paste_list())
+        existing_pastes = set(self.pastes)
+
+        new_pastes = fetched_pastes - existing_pastes
+        self.pastes = list(existing_pastes.union(fetched_pastes))
+
+        return list(new_pastes)
 
     def fetch_paste(self, paste_index):
         if paste_index >= len(self.pastes):
@@ -173,4 +178,7 @@ class PastebinClient(PastebinAPI):
         return len(self.pastes)
 
     def get_pastes_by_language(self, lang):
-        return [i for i, paste in enumerate(self.pastes) if paste.lang.lower() == lang.lower()]
+        return [
+            self.pastes[i] for i, paste in enumerate(self.pastes)
+            if paste.lang.lower() == lang.lower()
+        ]