python settings using dir getattr setattr

dir()函数
内建dir()列出模块定义的标识符(函数，类或者变量）

getattr(object,name,default)

取得object的name成员的value,如果name成员不存在就返回default的值，如果default未给出则raise AttributeError.

setattr(object,name,value)

新建/修改object的name成员的值为value。

Example:

#settings.py
BEHAVIORS={
'Red':'generic',
'Blue':'post',
'Gold':'sharing',
'Green':'upload',
'Orange':'tag',
'Purple':'downld',
}

#Test.py
import setings as _settings

class Settings():
def __init__(self,setting_module):
for setting ii dir(setting_module):
if setting == setting.upper():
setattr(self.setting,getattr(setting_module,setting))
settings = Settings(_settings)

try:
print getattr( settings, 'BEHAVIORS')
except AttributeError,e:
print e