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This article introduces how to operate the Python language in C language, the content is very detailed, interested friends can refer to, I hope it can be helpful to you.

The Python language appears in many languages. There are many problems in our continuous learning and use. Let's learn the relevant knowledge in detail and how to use it in the C language environment. I hope you all get something.

When we think about problems, it may be easy to understand objects, but computers can only understand byte sequences such as the 0Magne1 sequence. Fundamentally speaking, the objects in our computer language are just 0Magne1 sequences in a piece of memory space. These consecutive or discontinuous memory spaces can be seen as a whole at a higher level. In Python language, the general object we mentioned is a piece of memory space requested by the structure in C on the heap Heap.

In order to implement the object-oriented mechanism of the Python language in C language, it is necessary to define some structures that can manipulate the memory space of those objects.

All Python language objects have something in common, which we highly abstract into a structure, PyObject.

Typedef struct _ object {PyObject_HEAD} PyObject; / / in fact, the macro PyObject_HEAD in the distribution is int ob_refcnt; struct _ typeobject * ob_type; typedef struct _ object {PyObject_HEAD} PyObject; / / the macro PyObject_HEAD in the distribution is int ob_refcnt; struct _ typeobject * ob_type

Ob_refcnt, which is object reference counting, exists to implement the garbage collection mechanism based on reference technology in Python language.

There is also a pointer to a type object structure that represents the type of the object.

In the implementation of C language, there is also a structure extended to PyObject.

That is PyVarObject, its content is PyObject_VAR_HEAD this macro, it has one more ob_size than PyObject, and please don't be confused. There is no corresponding relationship between PyObject and PyVarObject and real objects in the Python world. These two are just an abstraction of all Python objects in the C language representation. That is to say, in C language, as long as it is the data of a Python language object structure, the beginning of its memory will have several variables of the above structure body, so a PyObject pointer can point to all the structures representing Python objects in C language, so that in the implementation of C language, we can manipulate all built-in Python object structures through this unified pointer.

There is one thing that hasn't been mentioned just now, and that is the structure _ typeobject (PyTypeObject), which is an abstraction of all type objects in the Python language, so that we can call all type object structures at the C language level through the pointer of PyTypeObject.

C code

Typedef struct _ typeobject {/ / Note the beginning is PyObject_VAR_HEAD PyObject_VAR_HEAD char * tp_name; / * For printing, in format "." * / int tp_basicsize, tp_itemsize; / * For allocation * / / * Methods to implement standard operations * / destructor tp_dealloc; printfunc tp_print;. / * More standard operations (here for binary compatibility) * / hashfunc tp_hash; ternaryfunc tp_call;. } PyTypeObject; on how to achieve the operation of the Python language in the C language to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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