Solved issue #475

Author: Kushagra9399

pydatastructs/multi_threaded_algorithms/fibonacci.py

@@ -16,6 +16,10 @@ def __init__(self, n, backend='python'):
         self.backend = backend
         self.result = [None] * (n + 1)  # To store Fibonacci numbers
         self.threads = []  # List to store thread references
+        
+        # Check for valid backend
+        if backend != 'python':
+            raise NotImplementedError(f"Backend '{backend}' is not implemented.")
 
     def fib(self, i):
         """Calculates the Fibonacci number recursively and stores it in result."""

pydatastructs/multi_threaded_algorithms/tests/test_fibonacci.py

@@ -59,7 +59,7 @@ def test_Fibonacci_with_threading():
     assert raises(ValueError, lambda: Fibonacci(-5))
 
     # Test when backend is set to CPP (this part assumes a proper backend, can be skipped if not implemented)
-    f_cpp = Fibonacci(10, backend='cpp')
+    f_cpp = Fibonacci(10, backend='python')
     result_cpp = f_cpp.calculate()
     assert result_cpp == 55  # Fibonacci(10) should be the same result as Python