Made other minor improvements

european_roulette.py

@@ -292,7 +292,6 @@ def build_a_list_of_wager_types():
         selected_key = input("Enter a wager type (e.g. S3): ").strip().upper()
         if selected_key not in globals():
             print(f"'{selected_key}' is not defined.")
-            selected_key = input("Please enter a wager type to continue.  ")
             continue
         else:   
             wager_dict = globals()[selected_key]
@@ -465,14 +464,21 @@ def keep_playing():
 
 
 def main():
-    holdings = int(input("Enter your initial holdings at the start of play (e.g. 1000 for $1000):  "))
-    global playing
-    global DEBUG
-    global wagers
+    holdings = input("Enter your initial holdings at the start of play (e.g. 1000 for $1000):  ")
+    if not is_convertible_to_int(holdings):
+        print("You must enter an integer for your holdings.")
+        holdings = None
+        main()
+    else:
+        holdings = int(holdings)
+        global playing
+        global DEBUG
+        global wagers
     
     while playing:
           
         display_board()
+        print(f"Your holdings before the spin is ${holdings}")
         # User selects which dictionaries to search for number the wheel returns
         wager_type_list = build_a_list_of_wager_types()
         number = spin_wheel()