Comments added

calculator.py

@@ -1,3 +1,4 @@
+'''allows user to do basic calculations'''
 def calculator(sentence):
     num1=input("num1:")
     num2=input("num2:")
@@ -11,4 +12,4 @@ def calculator(sentence):
     elif addorwhat=='division':
         print (float(num1)/float(num2))
     elif addorwhat=="exponentiation":
-        print (float(num1)**float(num2))
+        print (float(num1)**float(num2))