def get_distribution_names(self):
        result = set()
        for locator in self.locators:
            try:
                result |= locator.get_distribution_names()
            except NotImplementedError:
                pass
        return result


# We use a legacy scheme simply because most of the dists on PyPI use legacy
# versions which don't conform to PEP 426 / PEP 440.
Return all the distribution names known to this locator.
dataset/ETHPy150Open francelabs/datafari/windows/python/Lib/site-packages/pip/_vendor/distlib/locators.py/AggregatingLocator.get_distribution_names