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返回::'''[[self:PyIAQ|Python 罕见问题集]]'''

::-- ZoomQuiet [<<DateTime(2005-09-06T04:10:30Z)>>]
<<TableOfContents>>
= 问:创建对象很爽，但是如何更新？ =
''Q: That's great for creating objects; How about for updating?''

字典对象已经升级，现在可使用 `d.update(Dict(a=100, b=200))` 来更新字典;

但是其它对象还没有对应的处理,所以你得自个儿来:
`obj.a = 100; obj.b = 200`
当然也可以定义函式来进行更新,比如说:

Well, dictionaries have an update method, so you could do d.update(Dict(a=100, b=200)) when d is a dictionary. There is no corresponding method for objects, so you have to do obj.a = 100; obj.b = 200. Or you could define one function to let you do update(x, a=100, b=200) when x is either a dictionary or an object:
{{{#!python
import types

def update(x, **entries):
    if type(x) == types.DictType: x.update(entries)
    else: x.__dict__.update(entries)
    return x
}}}
This is especially nice for constructors:

同位素版本：)
{{{#!python
      def __init__(self, a, b, c, d=42, e=None, f=()):
        update(self, a=a, b=b, c=c, d=d, e=e, f=f)
}}}