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python使用点操作符访问字典(dict)数据的方法

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Release: 2016-06-10 15:17:09
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本文实例讲述了python使用点操作符访问字典(dict)数据的方法。分享给大家供大家参考。具体分析如下:

平时访问字典使用类似于:dict['name']的方式,如果能通过dict.name的方式访问会更方便,下面的代码自定义了一个类提供了这种方法。

class DottableDict(dict):
  def __init__(self, *args, **kwargs):
    dict.__init__(self, *args, **kwargs)
    self.__dict__ = self
  def allowDotting(self, state=True):
    if state:
      self.__dict__ = self
    else:
      self.__dict__ = dict()
d = DottableDict()
d.allowDotting()
d.foo = 'bar'
print(d['foo'])
# bar
print(d.foo)
# bar
d.allowDotting(state=False)
print(d['foo'])
# bar from http://www.jb51.net
print(d.foo)
# AttributeError: 'DottableDict' object has no attribute 'foo'
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希望本文所述对大家的Python程序设计有所帮助。

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