python实现分页

使用python实现分页功能。

        当我们有大量数据需要展示时，需要对数据进行分页展示。这时就用到了分页功能，分页使得数据更好的展示给用户。

        当访问页码数大于总页码数的时候。展示第一页内容。

import math

content = [
        {"name":"aa","age":17},
        {"name":"aa2","age":17},
        {"name":"aa3","age":19},
        {"name":"aa4","age":16},
        {"name":"aa5","age":11},
        {"name":"aa6","age":12},
        {"name":"aa7","age":13},
        {"name":"aa8","age":14}
]


class Pagination(object):

    def __init__(self, data_list, page_index, page_size):
        """
        初始化分页数据
        :param data_list: 数据列表
        :param page_index: 当前要查看的列表页
        :param page_size: 每页默认显式几条数据
        """
        self.data_list = data_list
        self.page_index = page_index
        self.page_size = page_size

    @property
    def start(self):
        return (self.page_index - 1) * self.page_size

    @property
    def end(self):
        return self.page_index * self.page_size

    @property
    def page_num(self):
        return math.ceil(len(self.data_list) / self.page_size)

    def show(self):
        """ 切片展示数据 """
        result = self.data_list[self.start:self.end]
        if result and self.page_index <= self.page_num:  # 正常分页
            return result, self.page_index
        else:
            self.page_index = 1
            result = self.data_list[self.start:self.end]
            return result


if __name__ == '__main__':
    p = Pagination(content, page_index=2, page_size=4)
    content, page_index = p.show()
    print(content)
    print(page_index)