Fix TypeError: Unicode-objects must be encoded before hashing

Author: Saumya-Mishra9129

arithmetic.py

@@ -478,22 +478,22 @@ def new_puzzles_cb(self, puzzles):
 
             md = hashlib.sha1()
             md.update(text.encode())
-            digest = hash(md.digest())
+            hash = md.hexdigest()
 
-            if digest not in self._puzzle_hashes:
-                self._puzzle_hashes.add(digest)
+            if hash not in self._puzzle_hashes:
+                self._puzzle_hashes.add(hash)
 
                 env_global = {}
                 env_local = {}
                 exec(text, env_global, env_local)
 
-                togglename = digest + "_toggle"
+                togglename = hash + "_toggle"
                 self.cloud[togglename] = groupthink.gtk_tools.SharedToggleButton(' ' + env_local['name'] + ' ')
                 self.cloud[togglename].set_active(False)
                 self.cloud[togglename].connect("toggled", self.puzzle_toggle_cb, hash)
                 self.cloud[togglename].sort_key = env_local['sort_key']
 
-                self._puzzle_code[digest] = env_local
+                self._puzzle_code[hash] = env_local
 
                 kids = self.inner_modebox.get_children()
                 old_size = len(kids)