getatter()通過(guò)方法名字符串調(diào)用方法，這個(gè)方法最主要的作用就是實(shí)現(xiàn)反射機(jī)制，也就是說(shuō)可以通過(guò)字符串獲取方法實(shí)例，這樣就可以把一個(gè)類可能要調(diào)用的方法放到配置文件里，需要的時(shí)候進(jìn)行動(dòng)態(tài)加載。

1: 可以從類中獲取屬性和函數(shù)

新建test.py文件,代碼如下:

# encoding:utf-8import sys class GetText(): def __init__(self): pass @staticmethod def A(): print('this is a staticmethod function') def B(self): print('this is a func') c = 'cc desc' if __name__ == ’__main__’: print(sys.modules[__name__]) # <module ’__main__’ from ’D:/腳本項(xiàng)目/lianxi/clazz/test.py’> print(GetText) # <class ’__main__.GetText’> # 獲取函數(shù) print(getattr(GetText, 'A')) # <function GetText.A at 0x00000283C2B75798> # 獲取函數(shù)返回值 getattr(GetText, 'A')() # this is a staticmethod function getattr(GetText(), 'A')() # this is a staticmethod function print(getattr(GetText, 'B')) # <function GetText.B at 0x000001371BF55798> # 非靜態(tài)方法不可用 # getattr(GetText, 'B')() getattr(GetText(), 'B')() # this is a func print(getattr(GetText, 'c')) # cc desc print(getattr(GetText(), 'c')) # cc desc

2:從模塊中獲取類(通過(guò)類名字符串得到類對(duì)象)

新建test1.py，代碼如下:

#encoding:utf-8import sysimport testprint(sys.modules[__name__]) # 從模塊中獲取類對(duì)象class_name = getattr(test, 'GetText')print(class_name) # <class ’test.GetText’> # 調(diào)用類的屬性和函數(shù)print(getattr(class_name, 'A')) # <function GetText.A at 0x000001D637365678># 獲取函數(shù)返回值getattr(class_name, 'A')() # this is a staticmethod functiongetattr(class_name(), 'A')() # this is a staticmethod function print(getattr(class_name(), 'B')) # <bound method GetText.B of <test.GetText object at 0x0000022D3B9EE348>># getattr(class_name, 'B')() 非靜態(tài)方法不可用getattr(class_name(), 'B')() # this is a func # 獲取屬性值print(getattr(class_name, 'c')) # cc descprint(getattr(class_name(), 'c')) # cc desc

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