Created
August 13, 2013 10:51
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# Put in const.py...: | |
class _const: | |
class ConstError(TypeError): pass | |
def __setattr__(self,name,value): | |
if self.__dict__.has_key(name): | |
raise self.ConstError, "Can't rebind const(%s)"%name | |
self.__dict__[name]=value | |
import sys | |
sys.modules[__name__]=_const() | |
# that's all -- now any client-code can | |
import const | |
# and bind an attribute ONCE: | |
const.magic = 23 | |
# but NOT re-bind it: | |
const.magic = 88 # raises const.ConstError | |
# you may also want to add the obvious __delattr__ |
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