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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def version(self):
 """Returns the device's version. The device's version is returned as a string of the format: M.mr where ``M`` is major number, ``m`` is minor number, and ``r`` is revision character. Args: self (JLink):
 the ``JLink`` instance Returns: Device version string. """

        version = int(self._dll.JLINKARM_GetDLLVersion())
        major = version / 10000
        minor = (version / 100) % 100
        rev = version % 100
        rev = '' if rev == 0 else chr(rev + ord('a') - 1)
        return '%d.%02d%s' % (major, minor, rev)