from decimal import Decimal

class Account:
    """
    Account class for demonstrating doctest.
    """
    
    def __init__(self, name, balance):
        """
        >>> account1 = Account('John Green', Decimal('50.00'))
        >>> account1.name
        'John Green'
        >>> account1.balance
        Decimal('50.00')

        The balance argument must be greater than or equal to 0.
        >>> account2 = Account('John Green', Decimal('-50.00'))
        Traceback (most recent call last):
            ...
        ValueError: Initial balance must be >= to 0.00.
        """

        if balance < Decimal('0.00'):
            raise ValueError('Initial balance must be >= to 0.00.')

        self.name = name
        self.balance = balance

    def deposit(self, amount):
        """
        >>> account1 = Account('John Green', Decimal('50.00'))
        >>> account1.deposit(Decimal('10.55'))
        >>> account1.balance
        Decimal('60.55')
        
        >>> account1.deposit(Decimal('-100.00'))
        Traceback (most recent call last):
            ...
        ValueError: amount must be positive.
        """

        self.balance += amount

if __name__ == '__main__':
    import doctest
    doctest.testmod(verbose=True)

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