coverage.py 文件源码

def __init__(self):
        super().__init__()
        for node_class in self.get_coverable_nodes():
            visit_method_name = 'visit_' + node_class.__name__
            if not hasattr(self, visit_method_name):
                if node_class == ast.ExceptHandler:
                    setattr(self, visit_method_name, self.inject_inside_visit)
                else:
                    setattr(self, visit_method_name, self.inject_before_visit)