I started learning python last week and I'm unable to get what's wrong here:
def add(x,y): """Adds 2 numbers and returns the result""" return x+y def sub(x,y): """Subtracts 2 numbers and returns the result""" return x-y a = int(input("Enter first number")) b = int(input("Enter second number")) c = int(input("Enter 1 for subtraction , 2 for addition and 3 for both")) try: if c>3: raise ValueError() except ValueError(): print ("Wrong choice") else: print ("Your choice is ",c) if (c==1): print ("Subtraction of 2 numbers=",(sub(a,b))) if (c==2): print ("Addition of 2 numbers = ",(add(a,b))) if (c==3): print ("Subtraction of 2 numbers=",(sub(a,b))) print ("Addition of 2 numbers = ",(add(a,b))) If I enter 4 it throws this error:
Traceback (most recent call last): File "C:/Program Files (x86)/Python35-32/calculator.py", line 15, in <module> raise ValueError() ValueError During handling of the above exception, another exception occurred:
Traceback (most recent call last): File "C:/Program Files (x86)/Python35-32/calculator.py", line 16, in <module> except ValueError(): TypeError: catching classes that do not inherit from BaseException is not allowed 
