takes two parameters to initialize the instance variables name and balance. The name must not be an empty string. The name also must not include any numbers or symbols. The balance must be zero or more to be used. If the name was an empty string a Value Error will be raised with the message “name cannot be empty” If the name contained numbers or symbols a Value Error will be raised with the message “name cannot include numbers or symbols”

The functionality of each file is described below:
Class BankAccount 
This class has two instance variables:
name
balance
Create a constructor that takes two parameters to initialize the instance variables name and balance. The name must not be an empty string. The name also must not include any numbers or symbols. The balance must be zero or more to be used.
If the name was an empty string a Value Error will be raised with the message “name cannot be empty”
If the name contained numbers or symbols a Value Error will be raised with the message “name cannot include numbers or symbols”
If the name was valid, it will be formatted properly and assigned to the instance variable. 
The valid name consists of alphabetical characters lowercase or upper case, may include space, underscore or hyphen.
The name may consist of first, middle and last name.
One way to validate the name is using Regular Expressions.
Proper name format is the first character uppercase and the rest of the name lowercase character. For example, if the value “joHn jAcK bLaCk” was given the name instance variable would hold “John Jack Black”.
If the balance was less than zero a Value Error will be raised with the message “balance cannot be negative”
If the balance was 0 or a positive number it will be assigned to the instance variable balance
Create method displayDetails(), the method will display the name and the balance in an organized manner
Create method deposit(), the method accepts amount as a parameter. If the passed parameter was positive it will be added to the balance otherwise, a Value Error will be raised with the message “amount cannot be zero or less”
Create method withdraw(), the method accepts amount as a parameter. 
If the passed parameter was negative or zero a Value Error will be raised (“ amount cannot be zero or less than zero”
If the passed parameter was greater than balance a Value Error will be raised “Insufficient funds”
If the amount was valid i.e. greater than 0 and less or equal to the balance, the amount will be deducted from the balance

main.py
This file will import BankAccount.py and create the main method
The main method will handle all the errors in a try-except block
The main method will implement the following
Ask the user to input name and balance and use them to create a BankAccount object. 
If  some or all are values were invalid the user will be asked again to input the name and the balance
 If all the provided values were valid, the loop will be terminated and the values will be used to create a BankObject. 
The main method will display the following choices:
deposit
withdraw
The user will be asked to choose the transaction type and the transaction will be completed. 
If an Error was raised, the user will be notified and he/she will be asked if he/she wants to continue
If the transaction was successful the details of the BankAccount object will be displayed
The  user will be asked if he/she wants to make another transaction
The process will be repeated until the user chooses to terminate the loop