Python Django如何添加首页尾页上一页下一页功能

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>书籍列表</title> <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" > </head> <body> <div class="container"> <table class="table table-bordered"> <thead> <tr> <th>序号</th> <th>id</th> <th>书名</th> </tr> </thead> <tbody> {% for book in books %} <tr> <td>{{ forloop.counter }}</td> <td>{{ book.id }}</td> <td>{{ book.title }}</td> </tr> {% endfor %} </tbody> </table> <nav aria-label="Page navigation"> <ul class="pagination"> <li> {{ page_html|safe }} </li> </ul> </nav> </div> </body> </html>

from django.shortcuts import render from app01 import models def book_list(request): # 从 URL 中取参数 page_num = request.GET.get("page") print(page_num, type(page_num)) page_num = int(page_num) # 定义两个变量保存数据从哪儿取到哪儿 data_start = (page_num - 1) * 10 data_end = page_num * 10 # 书籍总数 total_count = models.Book.objects.all().count() # 每一页显示多少条数据 per_page = 10 # 总共需要多少页码来显示 total_page, m = divmod(total_count, per_page) # 页面上最多展示的页码 max_page = 11 half_max_page = max_page // 2 # 页面上展示的页码的开始页 page_start = page_num - half_max_page # 页面上展示的页码的结束页 page_end = page_num + half_max_page # 如果当前页减一半比 1 小 if page_start <= 1: page_start = 1 page_end = max_page # 如果当前页加一半比总页码还大 if page_end > total_page: page_end = total_page page_start = total_page - max_page + 1 # 如果还有数据 if m: total_page += 1 all_book = models.Book.objects.all()[data_start:data_end] # 拼接 html 的分页代码 html_list = [] # 添加首页按钮 html_list.append('<li><a href="/book_list/?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a></li>') # 如果是第一页，就没有上一页 if page_num <= 1: html_list.append('<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(page_num-1)) else: # 加一个上一页的标签 html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(page_num-1)) # 展示的页码 for i in range(page_start, page_end + 1): # 给当前页添加 active if i == page_num: tmp = '<li class="active"><a href="/book_list/?page={0}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i) else: tmp = '<li><a href="/book_list/?page={0}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i) html_list.append(tmp) # 如果是最后一页，就没有下一页 if page_num >= total_page: html_list.append('<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>') else: html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>'.format(page_num+1)) # 添加尾页按钮 html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>'.format(total_page)) page_html = "".join(html_list) # 拼接 html 的分页代码 return render(request, "book_list.html", {"books": all_book, "page_html": page_html})

from django.shortcuts import render from app01 import models def book_list(request): # 从 URL 中取参数 page_num = request.GET.get("page") print(page_num, type(page_num)) # page_num 为 str 类型 # 书籍总数 total_count = models.Book.objects.all().count() # 每一页显示多少条数据 per_page = 10 # 总共需要多少页码来显示 total_page, m = divmod(total_count, per_page) # 如果还有数据 if m: total_page += 1 try: page_num = int(page_num) # 如果输入的页码数超过了最大的页码数，默认返回最后一页 if page_num > total_page: page_num = total_page # 如果输入的页码数小于 1，则返回第一页 if page_num < 1: page_num = 1 except Exception as e: # 当输入的页码不是正经数字的时候默认返回第一页的数据 page_num = 1 # 定义两个变量保存数据从哪儿取到哪儿 data_start = (page_num - 1) * 10 data_end = page_num * 10 # 页面上最多展示的页码 max_page = 11 half_max_page = max_page // 2 # 页面上展示的页码的开始页 page_start = page_num - half_max_page # 页面上展示的页码的结束页 page_end = page_num + half_max_page # 如果当前页减一半比 1 小 if page_start <= 1: page_start = 1 page_end = max_page # 如果当前页加一半比总页码还大 if page_end > total_page: page_end = total_page page_start = total_page - max_page + 1 all_book = models.Book.objects.all()[data_start:data_end] # 拼接 html 的分页代码 html_list = [] # 添加首页按钮 html_list.append('<li><a href="/book_list/?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a></li>') # 如果是第一页，就没有上一页 if page_num <= 1: html_list.append('<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(page_num-1)) else: # 加一个上一页的标签 html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(page_num-1)) # 展示的页码 for i in range(page_start, page_end + 1): # 给当前页添加 active if i == page_num: tmp = '<li class="active"><a href="/book_list/?page={0}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i) else: tmp = '<li><a href="/book_list/?page={0}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i) html_list.append(tmp) # 如果是最后一页，就没有下一页 if page_num >= total_page: html_list.append('<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>') else: html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>'.format(page_num+1)) # 添加尾页按钮 html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>'.format(total_page)) page_html = "".join(html_list) # 拼接 html 的分页代码 return render(request, "book_list.html", {"books": all_book, "page_html": page_html})

from django.shortcuts import render from app01 import models def book_list(request): # 从 URL 中取参数 page_num = request.GET.get("page") print(page_num, type(page_num)) # page_num 为 str 类型 # 书籍总数 total_count = models.Book.objects.all().count() # 每一页显示多少条数据 per_page = 10 # 总共需要多少页码来显示 total_page, m = divmod(total_count, per_page) # 如果还有数据 if m: total_page += 1 try: page_num = int(page_num) # 如果输入的页码数超过了最大的页码数，默认返回最后一页 if page_num > total_page: page_num = total_page # 如果输入的页码数小于 1，则返回第一页 if page_num < 1: page_num = 1 except Exception as e: # 当输入的页码不是正经数字的时候默认返回第一页的数据 page_num = 1 # 定义两个变量保存数据从哪儿取到哪儿 data_start = (page_num - 1) * 10 data_end = page_num * 10 # 页面上最多展示的页码 max_page = 11 # 如果总页码数小于页面上最多展示的页码 if total_page < max_page: max_page = total_page half_max_page = max_page // 2 # 页面上展示的页码的开始页 page_start = page_num - half_max_page # 页面上展示的页码的结束页 page_end = page_num + half_max_page # 如果当前页减一半比 1 小 if page_start <= 1: page_start = 1 page_end = max_page # 如果当前页加一半比总页码还大 if page_end > total_page: page_end = total_page page_start = total_page - max_page + 1 all_book = models.Book.objects.all()[data_start:data_end] # 拼接 html 的分页代码 html_list = [] # 添加首页按钮 html_list.append('<li><a href="/book_list/?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a></li>') # 如果是第一页，就没有上一页 if page_num <= 1: html_list.append('<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(page_num-1)) else: # 加一个上一页的标签 html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(page_num-1)) # 展示的页码 for i in range(page_start, page_end + 1): # 给当前页添加 active if i == page_num: tmp = '<li class="active"><a href="/book_list/?page={0}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i) else: tmp = '<li><a href="/book_list/?page={0}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i) html_list.append(tmp) # 如果是最后一页，就没有下一页 if page_num >= total_page: html_list.append('<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>') else: html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>'.format(page_num+1)) # 添加尾页按钮 html_list.append('<li><a href="/book_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>'.format(total_page)) page_html = "".join(html_list) # 拼接 html 的分页代码 return render(request, "book_list.html", {"books": all_book, "page_html": page_html})

python的数据类型有哪些?

python的数据类型：1. 数字类型，包括int（整型）、long（长整型）和float（浮点型）。2.字符串，分别是str类型和unicode类型。3.布尔型，Python布尔类型也是用于逻辑运算，有两个值：True（真）和False（假）。4.列表，列表是Python中使用最频繁的数据类型，集合中可以放任何数据类型。5. 元组，元组用”()”标识，内部元素用逗号隔开。6. 字典，字典是一种键值对的集合。7. 集合，集合是一个无序的、不重复的数据组合。

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python的数据类型有哪些?

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