Django小知识

Django知识小问答

Django知识小问答

关于makemigrations

问：我用python manage.py makemigrations怎么没能将我的model文件生成数据？

答：可以給我看下model的文件目录吗？

问：目录是这样的

(venv) G:\git\bigbooom\bigboomm\citizen>tree /f
卷 study 的文件夹 PATH 列表
卷序列号为 0000000F B64E:66E1
G:.
    models.py
    models.pyc
    __init__.py
    __init__.pyc

答：嗯嗯，我知道，我想你应该是少了一个migrations的文件夹吧，所以他不知道你需要生成migrations，你试试在citizen文件夹下面建一个migrations，记得要在里面加一个init.py哦，不然也是不可以的

问：啊，可以了~~ Good Job

(venv) G:\git\bigbooom\bigboomm>python manage.py makemigrations
Migrations for 'citizen':
  citizen\migrations\0001_initial.py:
    - Create model Citizen

答：其实，一般Django中建app建议用

## cryptography 错误

报`RuntimeError: cryptography is required for sha256_password or caching_sha2_password`错：

File “C:\Users\shikanon\Desktop\新建文件夹\venv\lib\site-packages\pymysql\connections.py”, line 325, in init self.connect() File “C:\Users\shikanon\Desktop\新建文件夹\venv\lib\site-packages\pymysql\connections.py”, line 599, in connect self._request_authentication() File “C:\Users\shikanon\Desktop\新建文件夹\venv\lib\site-packages\pymysql\connections.py”, line 882, in _request_authentication auth_packet = _auth.caching_sha2_password_auth(self, auth_packet) File “C:\Users\shikanon\Desktop\新建文件夹\venv\lib\site-packages\pymysql_auth.py”, line 264, in caching_sha2_password_auth data = sha2_rsa_encrypt(conn.password, conn.salt, conn.server_public_key) File “C:\Users\shikanon\Desktop\新建文件夹\venv\lib\site-packages\pymysql_auth.py”, line 142, in sha2_rsa_encrypt raise RuntimeError(“cryptography is required for sha256_password or caching_sha2_password”) RuntimeError: cryptography is required for sha256_password or caching_sha2_password

只要安装`cryptography`包就可以了：
```pip install cryptography

windows 二进制包下载

https://www.lfd.uci.edu/~gohlke/pythonlibs/