python学习笔记

python -m django --version
django-admin startproject mysite
python manage.py runserver
python manage.py startapp polls

python manage.py makemigrations polls 生成数据库变更
python manage.py sqlmigrate polls 0001查看sql语句
python manage.py migrate 应用数据库变更
python manage.py shell 操作数据库命令行
python manage.py createsuperuser

list classmates = ['Michael', 'Bob', 'Tracy']
tuple classmates = ('Michael', 'Bob', 'Tracy')
dict d = {'Michael': 95, 'Bob': 75, 'Tracy': 85} d.get('Thomas', -1)
set s = set([1, 1, 2, 2, 3, 3])

列表生成式
list(range(1, 11))
[x * x for x in range(1, 11)]
[x * x for x in range(1, 11) if x % 2 == 0]
[m + n for m in 'ABC' for n in 'XYZ']

查看版本conda --version
创建环境conda create -n <env_name> python=x.x
删除环境conda remove -n <env_name> -all
激活环境activate <env_name>
退出环境deactivate
conda env list // 列出conda管理的所有环境
conda list // 列出当前环境的所有包

卸载，pip uninstall werkzeug

安装指定版本： pip install Werkzeug==0.16.1

pip3 install -i https://pypi.doubanio.com/simple/ -r requirements.txt