#!/usr/bin/python
# -*- coding: utf-8 -*-
import re
class Measure:
    def __init__(self, value):
        self.value = value
    
    def to_meters(self):
        result = re.search('([0-9\.]*)([cdkm]{1,2})', self.value, re.I)
        
        if not result:
            return None
        
        digits, char = result.groups()
        
        variants = { 'mm': 0.001,
                    'cm': 0.01,
                    'dm': 0.1,
                    'm': 1.0,
                    'km': 1000.0, 
                    }
        
        k = variants.get(char.lower())
        
        if not k:
            return None
        
        return float(digits) * k
tests = ('100000mm', '10000cm', '1000dm', '100m', '0.1km')
for test in tests:
    print('Measure of {} = {}'.format(test, Measure(test).to_meters()))