Actual steps for processing Python/c api numbers

When processing Python/c api numbers and strings, Python/c api provides the Py_BuildValue () function to convert numbers and strings, convert it to the corresponding data type in Python. The prototype of related functions is as follows.

PyObject * Py_BuildValue (const char * format ,...)

The parameter meanings are as follows.

Format: format the string,

The remaining parameters in the Py_BuildValue () function are integer, floating point, or string values in the C language to be converted. The returned value is a pointer of the PyObject type. In C, all Python types are declared as PyObject.

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Python/c api List Operation

Python/c api provides the PyList_New () function to create a new Python list. The Return Value of the PyList_New () function is the list created. The function prototype is as follows.

PyObject * PyList_New (Py_ssize_t len)

The parameter meanings are as follows.

Len: the length of the created list.

After the list is created, you can use the PyList_SetItem () function to add items to the list. The function prototype is as follows.

Int PyList_SetItem (PyObject * list, Py_ssize_t index, PyObject * item)

The parameter meanings are as follows.

List: list of items to be added.

Index: The Location index of the added item.

Item: the value of the added item.

You can also use the PyList_GetItem () function in Python/c api to obtain the value of an item in the list. The value returned by the PyList_GetItem () function. The function prototype is as follows.

PyObject * PyList_GetItem (PyObject * list, Py_ssize_t index)

The parameter meanings are as follows.

List: list of operations to be performed.

Index: The index of the position of the item.

The Python/c api provides functions that correspond to list operations in Python. For example, the List append method corresponds to the PyList_Append () function. The sort method of the list corresponds to the PyList_Sort () function. The reverse Method of the list corresponds to the PyList_Reverse () function. The function prototype is as follows.

Int PyList_Append (PyObject * list, PyObject * item)

Int PyList_Sort (PyObject * list)

Int PyList_Reverse (PyObject * list)

For the PyList_Append () function, the parameter meanings are as follows.

List: list of operations to be performed.

Item: the item to participate in.

For PyList_Sort () and PyList_Reverse () functions, the parameter meanings are the same.

List: list of operations to be performed.