python func defaults args are evaluated only once,(in definition time)
2014-04-26 11:20
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In [7]: def r(): ...: return random.randint(1,100) ...:
In [12]: def d(a, b=r()): ....: print b,'-------------' ....: In [13]: d(9) 75 ------------- In [14]: d(9) 75 -------------默认参数只在函数定义时被计算出值
In [18]: d.func_defaults Out[18]: (75,)
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