module_dependency.py 文件源码

def _is_relative_import(module_name, path):
        """Checks if import is relative. Returns True if relative, False if
        absolute, and None if import could not be found."""
        try:
            # Check within the restricted path of a (sub-)package
            imp.find_module(module_name, [path])
        except ImportError:
            pass
        else:
            return True

        try:
            # Check across all of sys.path
            imp.find_module(module_name)
        except ImportError:
            pass
        else:
            return False

        # Module could not be found on system due to:
        # 1. Import that doesn't exist. "Bad import".
        # 2. Since we're only scanning the AST, there's a good chance the
        #    import's inclusion is conditional, and would never be triggered.
        #    For example, an import specific to an OS.
        return None