install.py 文件源码

def setuptools_run(self):
        """ The setuptools version of the .run() method.

        We must pull in the entire code so we can override the level used in the
        _getframe() call since we wrap this call by one more level.
        """
        from distutils.command.install import install as distutils_install

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

        # Attempt to detect whether we were called from setup() or by another
        # command.  If we were called by setup(), our caller will be the
        # 'run_command' method in 'distutils.dist', and *its* caller will be
        # the 'run_commands' method.  If we were called any other way, our
        # immediate caller *might* be 'run_command', but it won't have been
        # called by 'run_commands'.  This is slightly kludgy, but seems to
        # work.
        #
        caller = sys._getframe(3)
        caller_module = caller.f_globals.get('__name__', '')
        caller_name = caller.f_code.co_name

        if caller_module != 'distutils.dist' or caller_name!='run_commands':
            # We weren't called from the command line or setup(), so we
            # should run in backward-compatibility mode to support bdist_*
            # commands.
            distutils_install.run(self)
        else:
            self.do_egg_install()