Entry
Roman numerals
Apr 2nd, 2009 06:47
engatoo engatoo, osososo didididi, Nathan Wallace, Hans Nowak, Snippet 253, unknown...?
"""
Packages: miscellaneous.mundane
"""
import re
iv = re.compile("IV")
ix = re.compile("IX")
xl = re.compile("XL")
xc = re.compile("XC")
cd = re.compile("CD")
cm = re.compile("CM")
i = re.compile("I" )
v = re.compile("V" )
x = re.compile("X" )
l = re.compile("L" )
c = re.compile("C" )
d = re.compile("D" )
m = re.compile("M" )
def RomanNumeralsToDecimal(roman_string):
import re, string
str = string.upper(roman_string)
exp = ""
if iv.search(str) != None: str = iv.sub("+4", str)
if ix.search(str) != None: str = ix.sub("+9", str)
if xl.search(str) != None: str = xl.sub("+40", str)
if xc.search(str) != None: str = xc.sub("+90", str)
if cd.search(str) != None: str = cd.sub("+400", str)
if cm.search(str) != None: str = cm.sub("+900", str)
if i.search(str) != None: str = i.sub("+1", str)
if v.search(str) != None: str = v.sub("+5", str)
if x.search(str) != None: str = x.sub("+10", str)
if l.search(str) != None: str = l.sub("+50", str)
if c.search(str) != None: str = c.sub("+100", str)
if d.search(str) != None: str = d.sub("+500", str)
if m.search(str) != None: str = m.sub("+1000", str)
exec "num = " + str
return num
def DecimalToRomanNumerals(base10_integer):
'''Translated from a public domain C routine by Jim Walsh in the
Snippets collection.
'''
roman = ""
n, base10_integer = divmod(base10_integer, 1000)
roman = "M"*n
if base10_integer >= 900:
roman = roman + "CM"
base10_integer = base10_integer - 900
while base10_integer >= 500:
roman = roman + "D"
base10_integer = base10_integer - 500
if base10_integer >= 400:
roman = roman + "CD"
base10_integer = base10_integer - 400
while base10_integer >= 100:
roman = roman + "C"
base10_integer = base10_integer - 100
if base10_integer >= 90:
roman = roman + "XC"
base10_integer = base10_integer - 90
while base10_integer >= 50:
roman = roman + "L"
base10_integer = base10_integer - 50
if base10_integer >= 40:
roman = roman + "XL"
base10_integer = base10_integer - 40
while base10_integer >= 10:
roman = roman + "X"
base10_integer = base10_integer - 10
if base10_integer >= 9:
roman = roman + "IX"
base10_integer = base10_integer - 9
while base10_integer >= 5:
roman = roman + "V"
base10_integer = base10_integer - 5
if base10_integer >= 4:
roman = roman + "IV"
base10_integer = base10_integer - 4
while base10_integer > 0:
roman = roman + "I"
base10_integer = base10_integer - 1
return roman
if __name__ == "__main__":
'''We'll test the conversion routines by converting from a decimal
integer n to a Roman numeral and then back again. If the
operations
are not the identity transformation, it's an error.
'''
largest_number = 5000
for num in xrange(1,largest_number+1):
str = DecimalToRomanNumerals(int(num))
number = RomanNumeralsToDecimal(str)
if number != num:
print "Routines failed for", num
raise "Test failure"
print "Test passed."
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