python中的闭包 for python 3.x#5
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tanteng merged 1 commit intotanteng:masterfrom Apr 25, 2016
xiaoxiaoyao:patch-1
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UnboundLocalError: local variable 'count' referenced before assignment. 什么意思?就是说conut这个变量你没有定义就直接引用了,我不知道这是个什么东西,程序就崩溃了.于是,再python3里面,引入了一个关键字:nonlocal,这个关键字是干什么的?就是告诉python程序,我的这个count变量是再外部定义的,你去外面找吧.然后python就去外层函数找,然后就找到了count=0这个定义和赋值,程序就能正常执行了.
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python3.X 底层加上了可爱的下面两个函数。 C代码 Return value: Borrowed reference. int PyFunction_SetClosure(PyObject *op, PyObject *closure) Set the closure associated with the function object op. closure must be Py_None or a tuple of cell objects. Raises SystemError and returns -1 on failure. |
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UnboundLocalError: local variable 'count' referenced before assignment.
什么意思?就是说conut这个变量你没有定义就直接引用了,我不知道这是个什么东西,程序就崩溃了.于是,再python3里面,引入了一个关键字:nonlocal,这个关键字是干什么的?就是告诉python程序,我的这个count变量是再外部定义的,你去外面找吧.然后python就去外层函数找,然后就找到了count=0这个定义和赋值,程序就能正常执行了.