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Today, I will talk to you about Python or C API numbers in the operation of the processing steps is what kind of, may not be a lot of people understand, in order to let you know more, Xiaobian summarized the following content for you, I hope you can according to this article to gain something.

The Python/C API provides the Py_BuildValue() function to convert numbers and strings into the corresponding data types in Python. The prototype of its correlation function is shown below.

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

The parameters have the following meanings.

format: Format a string,

The remaining arguments in the Py_BuildValue() function are integers, floating-point types, or strings in C to be converted. Pointer whose return value is of type PyObject. In C, all Python types are declared as PyObject.

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Python/C API List Operations

PyList_New() function is provided in Python/C API to create a new Python list. The PyList_New() function returns the list created. The prototype function is shown below.

PyObject* PyList_New( Py_ssize_t len)

The parameters have the following meanings.

len: Length of the list created.

After the list is created, you can add items to the list using the PyList_SetItem() function. The prototype function is shown below.

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

The parameters have the following meanings.

list: List of items to add.

index: The index of the location of the added item.

item: Value of the item being added.

You can also use the PyList_GetItem() function in the Python/C API to get the value of an item in a list. The PyList_GetItem() function returns the value of the item. The prototype function is shown below.

PyObject* PyList_GetItem( PyObject *list, Py_ssize_t index)

The parameters have the following meanings.

list: List of actions to be taken.

index: positional index of the item.

Functions corresponding to list operations in Python are provided in the Python/C API. For example, the append method for a list corresponds to the PyList_Append() function. The sort method for lists corresponds to the PyList_Sort() function. The reverse method of a list corresponds to the PyList_Reverse() function. The function prototypes are shown below.

int PyList_Append( PyObject *list, PyObject *item)

int PyList_Sort( PyObject *list)

int PyList_Reverse( PyObject *list)

For the PyList_Append() function, its parameters mean the following:

list: List of actions to be taken.

Item: The item to participate in.

For PyList_Sort() and PyList_Reverse() functions, the arguments have the same meaning.

list: List of actions to be taken.

After reading the above, do you have any further understanding of how Python or C API numbers are processed? If you still want to know more knowledge or related content, please pay attention to the industry information channel, thank you for your support.

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