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分享python3 ctypes 的 结构体定义中，怎么引用自身？
我这么使用时提示说“找不到Sentence_link”
```
class Sentence_link(ctypes.Structure):
_fields_= [("para_idx", ctypes.c_ulong), ("sent_idx", ctypes.c_ulong),("sent_init",ctypes.c_int),("msg_buff",ctypes.c_char_p), ("next",ctypes.POINTER(Sentence_link))]
```
```
_fields_= [("para_idx", ctypes.c_ulong), ("sent_idx", ctypes.c_ulong),("sent_init",ctypes.c_int),("msg_buff",ctypes.c_char_p), ("next",ctypes.POINTER(Sentence_link))]
NameError: name 'Sentence_link' is not defined
```
请问该如何引用自身？
```
class Sentence_link(ctypes.Structure):
_fields_= [("para_idx", ctypes.c_ulong), ("sent_idx", ctypes.c_ulong),("sent_init",ctypes.c_int),("msg_buff",ctypes.c_char_p), ("next",ctypes.POINTER(Sentence_link))]
```
```
_fields_= [("para_idx", ctypes.c_ulong), ("sent_idx", ctypes.c_ulong),("sent_init",ctypes.c_int),("msg_buff",ctypes.c_char_p), ("next",ctypes.POINTER(Sentence_link))]
NameError: name 'Sentence_link' is not defined
```
请问该如何引用自身？
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举世无双勇 2020-03-13
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https://blog.csdn.net/nb_zsy/article/details/104836310
举世无双勇 2020-03-13
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因为新的类 单元格在类语句本身中不可用。在ctypes中，我们可以 在类语句之后定义单元格类并设置_fields_属性
类似这样写
#重构struct list_head结构体
（+pass 定义的时候另起一行）
class list_head(ctypes.Structure):
pass
list_head._fields_ = [("next",POINTER(list_head)),("prev",POINTER(list_head))]
