Cython 使用 cinit()

Question

我有:

      cdef class BaseClass():
           def __cinit__(self,char* name):
               print "BaseClass __cinit__()"
               #...
           def __dealloc__():
               print "BaseClass __dealloc__()"
               #...
      cdef class DerClass(BaseClass):
           def __cinit__(self,char* name,int n):
               print "DerClass __cinit__()"
               #...
           def __dealloc__():
               print "DerClass __dealloc__()"
               #...

当我在 cyhton 中调用 DerClass 时，会自动调用 BaseClass 的构造函数，它必须打印的是:

       BaseClass __cinit__()
       DerClass __cinit__()
       DerClass __dealloc__()
       BaseClass __dealloc__()

但它没有，它崩溃了我称之为 DerClass('Ciao')的那些。
为什么会这样，我怎样才能避免调用 初始化 基类。
谢谢!

Answer 1

上面的答案可能不是最好的解决方案。阅读上面链接的“初始化方法:__cinit__() 和 __init__()”部分提供了以下信息:

If your extension type has a base type, the __cinit__() method of the base type is automatically called before your __cinit__() method is called; you cannot explicitly call the inherited __cinit__() method.

和

If you anticipate subclassing your extension type in Python, you may find it useful to give the __cinit__() method * and ** arguments so that it can accept and ignore extra arguments.

所以我的解决方案是替换 __cinit()__ 的参数在 BaseClass以便可以将可变数量的参数传递给任何派生类:

cdef class BaseClass:
    def __cinit__(self, *argv): 
        print "BaseClass __cinit__()"
        #...
def __dealloc__(self):
        print "BaseClass __dealloc__()"
        #...

cdef class DerClass(BaseClass):
    def __cinit__(self,char* name, int n):
        print "DerClass __cinit__()"
        #...
    def __dealloc__(self):
        print "DerClass __dealloc__()"
        #...

见 here *args 的解释python中的变量