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valid numerical string is one with only digits and commas, and commas only appear at every three digits. In addition a valid string only starts with a 0 if it has exactly one character.

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def valid_format(s):

    """

    Returns True if s is a valid numerical string; it returns False otherwise.

   

    A valid numerical string is one with only digits and commas, and commas only

    appear at every three digits.  In addition, a valid string only starts with

    a 0 if it has exactly one character.

   

    Pay close attention to the precondition, as it will help you (e.g. only numbers

    < 1,000,000 are possible with that string length).

   

    Examples:

        valid_format('12') returns True

        valid_format('apple') returns False

        valid_format('1,000') returns True

        valid_format('1000') returns False

        valid_format('10,00') returns False

        valid_format('0') returns True

        valid_format('012') returns False

   

    Parameter s: the string to check

    Precondition: s is nonempty string with no more than 7 characters

    """

    text=len(s)

    text1= introcs.count_str(s,',')

    if s=='0':

        return True

    if text <=3 and introcs.isnumeric(s):

        return True

    else:

        return False

    pass

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