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                # dir # `dir` 在這個小節里我們會學習到`dir`以及它在自省方面如何給我們提供便利。 它是用于自省的最重要的函數之一。它返回一個列表,列出了一個對象所擁有的屬性和方法。這里是一個例子: ~~~ my_list = [1, 2, 3] dir(my_list) # Output: ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', # '__delslice__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', # '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', # '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', # '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', # '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', # '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', # 'remove', 'reverse', 'sort'] ~~~ 上面的自省給了我們一個列表對象的所有方法的名字。當你沒法回憶起一個方法的名字,這會非常有幫助。如果我們運行`dir()`而不傳入參數,那么它會返回當前作用域的所有名字。
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