<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def imprint(self, path=None):
 """Write the determined version, if any, to ``self.version_file`` or the path passed as an argument. """

        if self.version is not None:
            with open(path or self.version_file, 'w') as h:
                h.write(self.version + '\n')
        else:
            raise ValueError('Can not write null version to file.')
        return self