__repr__ voor Variable

main.py

@@ -22,7 +22,8 @@ class Variable(LambdaTerm):
     def __init__(self, symbol): 
         self.symbol = symbol
 
-    def __repr__(self): raise NotImplementedError
+    def __repr__(self): 
+        return f"Variable('{self.symbol}')"
 
     def __str__(self): 
         return str(self.symbol)
@@ -57,4 +58,4 @@ class Application(LambdaTerm):
 
     def reduce(self): raise NotImplementedError
 
-print(str(Variable('x')))
+print(repr(Variable('x')))
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