fix

main.py

@@ -8,7 +8,7 @@ dodaj - dodaj osobę
 list - listuj osoby
 list pesele
 pesel - sprawdź pesel osoby
-
+zapis - zapisanie danych do pliku
                                                                """)
 from pesel import PeselStorage
 storage = PeselStorage()
@@ -30,4 +30,4 @@ while True:
     def list_pesele():
         print("\n".join([": ".join([x.name, str(x.pesel)]) for x in storage.set]))
 
-    {"dodaj":enter, "list":_list, "pesel":get_pesel, "list pesele":list_pesele}[input("$ ")]()
+    {"dodaj":enter, "list":_list, "pesel":get_pesel, "list pesele":list_pesele, "zapis":lambda: storage.dump("dump.json")}[input("$ ")]()

pesel.py

@@ -52,7 +52,7 @@ class PeselStorage:
 
     def dump(self, filename:str):
         with open(filename, "w+") as f:
-            json.dump(list(self.set), f)
+            json.dump(list([x.__dict__ for x in self.set]), f)