文章目录

• • • • • • 1. SQLite 3.8.3 or later is required (found 3.7.17)
          • 2. ModuleNotFoundError: No module named '_sqlite3'
          • 3. 导入的django项目不能至直接运行
          • 4. 执行python3 manage.py makemigrations
          • 5. Forbidden (CSRF cookie not set.)
          • 6. pip安装模块出现连接问题
          • 7. django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.
          • 8. You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data.
          • 9. ModuleNotFoundError: No module named 'MySQLdb'
          • 10. RuntimeError: You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data
          • 11. django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: xxx
          • 12. django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.
          • 13. django.db.migrations.exceptions.InconsistentMigrationHistory: Migration admin.00
          • 14. Requested setting USE_I18N, but settings are not configured.
          • 15. ImportError: No module named 'MySQLdb'
          • 16. Ubuntu 下开发Django 报错 OSError: mysql_config not found

1. SQLite 3.8.3 or later is required (found 3.7.17)

raise ImproperlyConfigured('SQLite 3.8.3 or later is required (found %s).' % Database.sqlite_version)django.core.exceptions.ImproperlyConfigured: SQLite 3.8.3 or later is required (found 3.7.17).

① django版本降级

• 卸载当前的django版本：[root@instance-mtfsf05r mysite]# pip3 uninstall django
• 安装一个版本低一些的：[root@instance-mtfsf05r mysite]# pip3 install django==2.1.12

② 安装SQLite 3.8.3或以上的版本

【SQLite官网】：https://www.sqlite.org/download.html

• 下载SQLite3源码安装包：[root@instance-mtfsf05r ~]# wget https://www.sqlite.org/2019/sqlite-autoconf-3290000.tar.gz

• 解压缩：[root@instance-mtfsf05r ~]# tar -zxvf sqlite-autoconf-3290000.tar.gz

• 切换到sqlite目录下：[root@instance-mtfsf05r ~]# cd sqlite-autoconf-3290000/

• 释放编译文件：[root@instance-mtfsf05r sqlite-autoconf-3290000]# ./configure --prefix=/usr/local/sqlit329

• 编译和安装[root@instance-mtfsf05r sqlite-autoconf-3290000]# make && make install

• 查看当前全局sqlite3的版本检查sqlite3版本还是没有被改变，所以更改旧的sqlite3：

[root@instance-mtfsf05r ~]# sqlite3 -version
3.7.17 2013-05-20 00:56:22 118a3b35693b134d56ebd780123b7fd6f1497668
[root@instance-mtfsf05r ~]# mv /usr/bin/sqlite3 /usr/bin/sqlite3_old

• 为新版本创建软链接：[root@instance-mtfsf05r ~]# ln -s /usr/local/bin/sqlite3 /usr/bin/sqlite3

• 检查当前SQLite3版本：[root@instance-mtfsf05r ~]# sqlite3 --version

• 检查Python的SQLite3版本：[root@instance-mtfsf05r ~]# python3

>>>  import sqlite3
>>> sqlite3.sqlite_version
'3.29.0'

再次运行django项目：

2. ModuleNotFoundError: No module named ‘_sqlite3’

错误场景：运行Django项目的时候报错，找不到_sqlite3模块
问题原因：因为安装python3的时候没有找到安装sqlite3依赖
解决方式：安装这个模块，然后编译安装python3

[root@instance-mtfsf05r Python-3.7.3]# yum install sqlite*
[root@instance-mtfsf05r Python-3.7.3]# make  && make install

ps：在重新编译安装python的时候，需要安装一些依赖，下面是安装python的依赖：

[root@VM_39_157_centos ~]# yum install gcc patch libffi-devel python-devel  zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel -y

3. 导入的django项目不能至直接运行

解决方式：

1、第一步

2、第二步

4. 执行python3 manage.py makemigrations

执行python3 manage.py makemigrations报下面的错误:

You are trying to add a non-nullable field 'goods' to order without a default; we can't do that (the database needs something to populate existing rows).
Please select a fix:1) Provide a one-off default now (will be set on all existing rows with a null value for this column)2) Quit, and let me add a default in models.py
Select an option:

执行python3 manage.py migrate报下面的错误：

Operations to perform:Apply all migrations: admin, app, auth, contenttypes, sessions
Running migrations:No migrations to apply.Your models have changes that are not yet reflected in a migration, and so won't be applied.Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.

解决方式：thanlon@vivobook:~/git与gitee项目/github/alipay_django/app/migrations$ rm -rf 0001_initial.py

makemigrations 命令用于将定义的模型生成 0001_initial.py 文件，0001_initial.py中是生成数据表的脚本代码，migrate命令根据脚本呢代码在目标数据库中生成相对于的数据表。第一次创建过数据表，再次创建就会报上面的错误。

5. Forbidden (CSRF cookie not set.)

问题原因：CSRF cookie not set.这里使用了中间件，可以把CSRF中间件注释掉
解决方案：注释掉 django.middleware.csrf.CsrfViewMiddleware

MIDDLEWARE = ['django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.common.CommonMiddleware',# 'django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware',
]

6. pip安装模块出现连接问题

问题原因： 国外资源，访问比较慢
解决方案： 指定清华源或者豆瓣源下载，清华源：https://pypi.tuna.tsinghua.edu.cn/simple，豆瓣源：，使用的格式：

pip install -i  https://pypi.tuna.tsinghua.edu.cn/simple 模块名
pip install -i  https://pypi.douban.com/simple 模块名

7. django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.

问题来源：Django3.0中使用pymysql生成表的时候报错
解决方案：报错出现的原因是 mysqlclient 最低要求是1.3.13，而我们默认的是 0.9.3，所以需要修改为 0.9.3。网上有很多办法，这里使用最简单、最容易理解的方式就是 动态修改使用的 mysqlclient 版本。只需要修改 pymysql 中的 version_info 的值，默认是(1, 3, 12, “final”, 0)，修改为(1, 3, 13, “final”, 0)就可以解决了。可以进入install_as_MySQLdb方法中找到version_info变量查看默认值。

具体操作：

import pymysqlpymysql.version_info = (1, 3, 13, "final", 0) # (1, 3, 12, "final", 0)->(1, 3, 13, "final", 0)
pymysql.install_as_MySQLdb()

8. You called this URL via POST, but the URL doesn’t end in a slash and you have APPEND_SLASH set. Django can’t redirect to the slash URL while maintaining POST data.

具体报错内容：

You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to
the slash URL while maintaining POST data. Change your form to point to 127.0.0.1:8000/login.html/ (note the trailing 
slash), or set APPEND_SLASH=False in your Django settings.

问题来源：
urls.py：

urlpatterns = [path('login.html/', views.Login.as_view()),
]

login.html：

<form method="post" action="/login.html"><div class="form-group"><label for="">用户名</label><input type="text" name="username" class="form-control" id="name" placeholder="请输入用户名"autofocus></div><div class="form-group"><label for="">密码</label><input type="password" name="pwd" class="form-control" id="pwd" placeholder="请输入密码"></div><input type="submit" class="btn" value="登录" id="add_student" style="background: #f2dede;">
</form>

问题原因：可以发现，请求的url写错了，没有加斜杠

解决方案：url由 /login.html 修改为 /login.html/

9. ModuleNotFoundError: No module named ‘MySQLdb’

问题来源：将Django默认使用的sqlite更换为mysql时出现的报错

解决方案：除了在配置文件 settings.py 中配置连接的数据库之外还需要在与配置文件同级目录下的 __init__.py 文件中加入以下代码：

import pymysqlpymysql.version_info = (1, 3, 13, "final", 0)
pymysql.install_as_MySQLdb()

这里使用pymysql来连接数据库，我们都知道Django的ORM实质上是不负责连接数据的。另外把数据库的配置也贴出来仅供大家参考：

DATABASES = {'default': {# 'ENGINE': 'django.db.backends.sqlite3','ENGINE': 'django.db.backends.mysql','NAME': 'django_test','USER': 'root','PASSWORD': '123456','HOST': 'localhost','PORT': '3306'}
}

10. RuntimeError: You called this URL via POST, but the URL doesn’t end in a slash and you have APPEND_SLASH set. Django can’t redirect to the slash URL while maintaining POST data

问题翻译：运行时错误：您通过POST调用了此URL，但该URL不以斜线结尾，并且设置了附加斜线。Django在维护POST数据时不能重定向到斜杠URL。

问题原因：在使用AJAX向后台发送请求的时候报这样的错误

解决方案：url部分写错了，少了一个斜线，/csrf.html 是不正确的，应该是 /csrf.html/。

<script>$(function () {submitForm();});function submitForm() {$('#submit').click(function () {var user = $('#user').val();var token = $.cookie('csrftoken');$.ajax({url: '/csrf.html/', //可以不写，默认发送到本页面对应的视图函数中type: 'post',headers:{'X-CSRFToken':token},data: {'user': user},success: function (arg) {alert(arg) //ok}})})}
</script>

11. django.core.exceptions.ImproperlyConfigured: Application labels aren’t unique, duplicates: xxx

问题翻译：大致意思是应用程序标签不是唯一的

问题原因：INSTALLED_APPS 列表中有重复的元素（应用程序标签），比如误写了两个 'django.contrib.admin'

解决方案：删除重复的应用程序标签

12. django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.

问题翻译：大致意思是不支持在include()中指定名称空间而不提供app_name

问题原因：新版本的Django与旧版本的有所不同，在定义路由的时候会有所不同

解决方案：旧版本中定义路由，

from django.contrib import admin
from django.urls import path, includeurlpatterns = [path('admin/', admin.site.urls),path('', include('learning_logs.urls', namespace='learning_logs')),
]

新版本中定义路由：

from django.contrib import admin
from django.urls import path, includeurlpatterns = [path('admin/', admin.site.urls),path(' ', include(('learning_logs.urls', "learning_logs"), namespace='learning_logs')),
]

代码来自：https://blog.csdn.net/jason_cdd/article/details/106953974

13. django.db.migrations.exceptions.InconsistentMigrationHistory: Migration admin.00

问题原因：在重新封装更新用户表之前，已经更新了数据表，在数据库中已经有了django相关的依赖表，就会报这样的错误/异常

解决方案：删除原有的数据库（删除之前注意备份数据），然后重新建立数据库

参考：https://cloud.tencent.com/developer/article/1424629

14. Requested setting USE_I18N, but settings are not configured.

具体报错信息是：

django.core.exceptions.ImproperlyConfigured: Requested setting USE_I18N, but settings are not configured. You must
either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

报错来源：在Pycharm中打开Python控制台运行一些测试程序的时候报错

报错分析：请求的设置为USE_I18N，但未配置设置。必须先定义环境变量DJANGO_SETTINGS_MODULE或调用settings.configure()才能访问设置。

解决方案：具体什么原因，我也不太清楚。但如果想在Python Console正常运行代码，需要提前执行 from xxx.wsgi import *，其中xxx是你的项目名称。

15. ImportError: No module named ‘MySQLdb’

报错来源：Django中配置mysql
报错分析：使用的Python3版本，Python2中直接安装mysqldb，但是Python3需要安装mysqlclient
解决方法：pip install mysqlclient

16. Ubuntu 下开发Django 报错 OSError: mysql_config not found

报错来源：安装 MySQLdb 报错
报错分析：缺少相关依赖
解决方法：sudo apt install libmysqlclient-dev