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Mark Pilgrim
34 lines
991 B
Python
34 lines
991 B
Python
"""Convert to and from Roman numerals
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This program is part of "Dive Into Python 3", a free Python book for
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experienced programmers. Visit http://diveintopython3.org/ for the
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latest version.
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"""
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class OutOfRangeError(ValueError): pass
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roman_numeral_map = (('M', 1000),
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('CM', 900),
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('D', 500),
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('CD', 400),
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('C', 100),
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('XC', 90),
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('L', 50),
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('XL', 40),
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('X', 10),
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('IX', 9),
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('V', 5),
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('IV', 4),
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('I', 1))
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def to_roman(n):
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"""convert integer to Roman numeral"""
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# if n > 3999:
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# raise OutOfRangeError("number out of range (must be less than 3999)")
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result = ""
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for numeral, integer in roman_numeral_map:
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while n >= integer:
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result += numeral
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n -= integer
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return result
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