MVC的设计思想
MVC的设计模型
Django的MVC模型
MTV设计简介
MTV的设计模式
虚拟环境
https://www.cnblogs.com/kaid/p/8227635.html
django的安装
创建一个Django的项目
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安装virtualwrapper,打开终端,输入如下的命令
pip3 install virtualenvpip3 install virtualenvwrapper
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在配置文件~/.bash_profile中添加代码
# Settings for virtualenvwrapperexport WORKON_HOME=$HOME/.virtualenvssource /usr/local/bin/virtualenvwrapper.sh
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让配置生效
source ~/.bash_profile
创建虚拟环境
# 创建虚拟环境 $ virtualenv -p python3 ~/FOLDER-PATH/venv3
# 或更具体的指定路径(同样适用于Python2的安装) $ virtualenv -p /usr/local/opt/python/libexec/bin/python ~/FOLDER-PATH/venv3
# 进入虚拟环境 $ source ~/FOLDER-PATH/venv3/bin/activate
参考资料:https://cloud.tencent.com/developer/article/1005607
创建工程:django-admin startproject HelloDjango
进入项目根目录,创建一个app:python manage.py startapp App
可创建多个app的
启动服务:python manage.py runserver
python manage.py runserver 0.0.0.0:8000 所有人都能看见的ip
数据库的同步命令:python manage.py migrate
创建用户:python manage.py createsuperuser
安装的Python库:pip freeze
流程图:
models定义模型后的生成:
python manage.py makemigrations
后再执行迁移python manage.py migrate
mysql -uroot -p01206437
create database GP1HelloDjango
遇到的问题:
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.2
解决方案:
1、raise ImproperlyConfigured(‘mysqlclient 1.3.13 or newer is required; you have %s.’ % Database.version)
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.
解决办法:
C:Python37Libsite-packagesdjangodbackendsmysql(python安装目录)打开base.py,注释掉以下内容:
if version < (1, 3, 13): raise ImproperlyConfigured(‘mysqlclient 1.3.13 or newer is required; you have %s.’ % Database.version)
2、File “C:Python37libsite-packagesdjangodbackendsmysqloperations.py”, line 146, in last_executed_query
query = query.decode(errors=‘replace’)
AttributeError: ‘str’ object has no attribute ‘decode’
解决办法:
打开此文件把146行的decode修改为encode
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原文链接:https://blog.csdn.net/weixin_45476498/article/details/100098297
shell调试方法:python manage.py shell
遇到的问题:
TypeError: __init__() missing 1 required positional argument: 'on_delete'