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laskin.py

+luku = 0 
+print("Luku on 0")
+while True: 
+    operator = input("Anna operaatio (tyhjä lopettaa): ")
+    if "+" in operator: 
+        number = int(operator[1:])
+        luku = luku + number 
+        print(f"Luku on {luku}.")
+    elif "-" in operator: 
+        number = int(operator[1:])
+        luku = luku - number 
+        print(f"Luku on {luku}.")
+    elif "*" in operator: 
+        number = int(operator[1:])
+        luku = luku * number
+        print(f"Luku on {luku}.")
+    elif "/" in operator: 
+        number = int(operator[1:])
+        luku = int(luku / number)
+        print(f"Luku on {luku}.")
+    else: 
+        print("Kiiros ja moi!")
+        break
+
+