Python Basics

exec() and metaclass

One, the role of exec()exec executes Python statements stored in strings or files. Compared with eval, exec can execute more complex Python codes.grammar:exec(code,global_dict,local_dict)code: the incoming text codeglobal_dic: The dictionary passed in, the global namespace and the built-in namespace are receivedlocal_dict: incoming dictionary, receiving local name spaceexamplecode =''' global x x = 10 y = 20 ''' global_dict = {'x':200} local_dict = {} exec(code,global_dict,local_dict) print(glob

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