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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 read_configuration(self):
 """ Read the PyPI access configuration as supported by distutils, getting PyPI to do the actual work. This populates ``username``, ``password``, ``realm`` and ``url`` attributes from the configuration. """

        # get distutils to do the work
        c = self._get_pypirc_command()
        c.repository = self.url
        cfg = c._read_pypirc()
        self.username = cfg.get('username')
        self.password = cfg.get('password')
        self.realm = cfg.get('realm', 'pypi')
        self.url = cfg.get('repository', self.url)