<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def write(self, output_io):
        '''Write a taxonomy to an open stream out in GG format. Code calling this
        function must open and close the io object.'''
        for name, tax in self.taxonomy.items():
            output_io.write("%s\t%s\n" % (name, '; '.join(tax)))