Use the techniques of Section 1.7 to revise the charge and make payment methods of the CreditCard class to ensure that the caller sends a number as a parameter.   If the parameter to the make payment...

Use the techniques of Section 1.7 to revise the charge and make payment

methods of the CreditCard class to ensure that the caller sends a number

as a parameter.

If the parameter to the make payment method of the CreditCard class

were a negative number, that would have the effect of
raising
the balance

on the account. Revise the implementation so that it raises a ValueError if

a negative value is sent.