def get_distribution_names(self):
result = set()<EOL>for locator in self.locators:<EOL><INDENT>try:<EOL><INDENT>result |= locator.get_distribution_names()<EOL><DEDENT>except NotImplementedError:<EOL><INDENT>pass<EOL><DEDENT><DEDENT>return result<EOL>
Return all the distribution names known to this locator.