In python: Make a BankAccount class.
The class should have the initial balance be set
to a parameter passed into the constructor, but should be 0 if no such parameter is passed in.
It should have a method called "withdraw" that withdraws an amount that's supplied
as a parameter and returns the new balance. It should also have a method called "deposit"
that deposits an amount that's supplied as a parameter and returns the new balance.
Both "withdraw" and "deposit" should alter the account's balance.
Have a method that return a current balance.
Your function should construct a "banking", make some withdraw and deposits and print out
your current balance. It should return a current balance