formatted

Author: Karandeep Grover

Basics/Hindi/25_decorators/25_decorators.md

@@ -1,22 +1,16 @@
 ## Exercise: Decorators
 
-1. Create decorator function to check that the argument passed to the function factorial is a positive integer:
+1. Create a decorator function to check that the argument passed to the function factorial is a non-negative integer:
 
-```
-example: 
-
-    factorial(-1) : raise Exception or print error message
+2. Create a factorial function which finds the factorial of a number.
 
-    
-```
-
-
-2. Also check that number is integer or not
+3. Use the decorator to decorate the factorial function to only allow factorial of non-negative integers.
 ```
 example: 
 
     factorial(1.354) : raise Exception or print error message
+    factorial(-1) : raise Exception or print error message
+    factorial(5) : 60
 
-    
 ```
 [Solution](https://github.com/codebasics/py/blob/master/Basics/python_basicsHindi/25_decorators/25_decorators.py)

Basics/Hindi/25_decorators/25_decorators.py

@@ -3,17 +3,28 @@ def helper(x):
         if type(x) == int and x > 0:
             return f(x)
         else:
-            raise Exception("Argument is not an integer")
+            raise Exception("Argument is not a non-negative integer")
+
     return helper
-    
+
+
 @check
 def factorial(n):
     if n == 1:
         return 1
     else:
-        return n * factorial(n-1)
+        return n * factorial(n - 1)
+
+
+for i in range(1, 10):
+    print(i, factorial(i))
 
-for i in range(1,10):
-	print(i, factorial(i))
+try:
+    print(factorial(-1))
+except Exception as e:
+    e.print_exception()
 
-print(factorial(-1))
+try:
+    print(factorial(1.354))
+except Exception as e:
+    e.print_exception()