install.py 文件源码

def run(self):
        # Explicit request for old-style install?  Just do it
        if self.old_and_unmanageable or self.single_version_externally_managed:
            return orig.install.run(self)

        if not self._called_from_setup(inspect.currentframe()):
            # Run in backward-compatibility mode to support bdist_* commands.
            orig.install.run(self)
        else:
            self.do_egg_install()