Created
October 31, 2012 09:45
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overload dict.setdefault,when key exist and value is empty string or None, still set default value to the key.
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| #-*- coding:utf-8 -*- | |
| ''' | |
| 重载setdefault方法，当key存在，并且value为空字符串或None时，也会设置为defaultvalue。 | |
| >>> d = alwaysdefaultdict() | |
| >>> d.setdefault('key','') | |
| '' | |
| >>> d.setdefault('key','default') | |
| 'default' | |
| >>> d.get('key') | |
| 'default' | |
| >>> d.setdefault('key','newvalue') | |
| 'default' | |
| >>> d.get('no_key') | |
| >>> d['newkey']='newvalue' | |
| >>> d.get('newkey') | |
| 'newvalue' | |
| >>> d['newkey'] | |
| 'newvalue' | |
| ''' | |
| class alwaysdefaultdict(dict): | |
| def setdefault(self, key, defaultvalue): | |
| if self.has_key(key): | |
| if self.get(key): | |
| return self.get(key) | |
| else: | |
| del self[key] | |
| return super(alwaysdefaultdict, self).setdefault(key, defaultvalue) |
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