方法一：透過異常捕捉來實現邏輯

class FooClass: pass k = FooClass() try: #do some thing you need print k.att except AttributeError as e: #error: has not attribute pass

hasattr(object, name)說明：判斷物件object是否包含名為name的特性（hasattr是透過呼叫getattr(ojbect, name)是否丟擲異常來實現的）。 引數object：物件。 引數name：特性名稱。

>>> hasattr(list, "append")

True

>>> hasattr(list, "add")

False

objlist = dir(k)

if "att" in objlist:

#do some thing you need

print k.att

else:

#error: has not attribute

pass

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