How to use 'how to add number in list in python' in Python

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def add_commas_to_number(the_num):
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    """Add commas to thousandths places--or return an error message
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    https://stackoverflow.com/questions/5180365/python-add-comma-into-number-string
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    """
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    if not the_num:
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        return None, "You must specify a number"
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    #
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    if type(the_num) == int:
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        return '{:,}'.format(the_num), None
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    elif type(the_num) == float:
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        return '{:,.2f}'.format(the_num), None # Rounds to 2 decimal places
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    else:
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        err_msg = ('Please use an int or float.')
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        return None, err_msg

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def add_numbers():
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    """
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    Basic approximation of all known explicit number expressions.
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    Handles:
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        fractions (quarter/half)
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        cardinal numbers <1, 59>
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    """
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    for fraction, fraction_spelling in [(0.25, 'quarter'), (0.5, 'half')]:
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        add_db_number(fraction, fraction_spelling)
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    for cardinal in xrange(60):
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        add_db_number(cardinal, spell_number(cardinal))
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    for single_digit in xrange(9):
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        add_db_number(single_digit, "zero " + spell_number(single_digit))
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        add_db_number(single_digit, "o " + spell_number(single_digit))