How to Create a User Define Exception in Python

We can define our own exception derived from the Exception class. Usually, in a module, we define a single base class derived from Exception and derive all the other exception classed from that. An example of this is shown below,

class Error(Exception):
    pass
    
class valueTooLarge(Error):
    pass
    
class valueTooSmall(Error):
    pass
def main():
    
    number = 7
    
    try:
        input_number = int(input("Enter a number:"))
        
        if input_number > number:
            raise valueTooLarge
        
        if input_number < number:
            raise valueTooSmall
            
        else:
            print("perfect")
            
    
    except valueTooLarge:
        print("Value is too large")
        
    except valueTooSmall:
        print("Value is too small")
        
    finally:
        print("Exception over")
if __name__ == "__main__":
    main()