1. 什么是Python环境 要搞清楚什么是虚拟环境,首先要清楚Python的环境指的是什么。当我们在执行pythontest.py时,思考如下问题: python哪里来?这个主要归功于配置的系统环境变量PATH,当我们在命令行中运行程序时,系统会根据PATH配置的路径列表依次查寻是否有可执行文件python(在windows中,省略了后缀.exe),当查寻到该文...
Table ‘xxx’ already exists: 这个错误意味着你已经有一个与你的模型同名的数据库表。你可以使用python manage.py migrate <app_name>zero命令来重置你的数据库。 NameError: name ‘xxx’ is not defined: 这个错误可能是由于在迁移文件中使用了未定义的字段或方法。确保你引用的所有字段和方法都已在模型中定义。
提示django_content_type' already exists的报错原因在django_migrations表中有对应的表格迁移记录,执行python manage.py migrate命令迁移的数据和django_migrations表格中的不一致(这种情况一般是发生在第一次运行别人的项目代码时)。 简单粗暴的解决办法: 第一步、备份好除django_content_type;django_migrations;这两个表...
Rolling average (with any time window) Let's download the two datasets for 2021: # Downloading GridMettmin():url='https://www.northwestknowledge.net/metdata/data/tmmn_2021.nc'savename='tmin_gridmet_2021.nc'urllib.request.urlretrieve(url,savename)# DownloadingCPC-Globetmin(0.5deg,~50km):...
django 源码解读 python manage.py makemigrations 分析命令之前,需要先了解makemigrations 调用的一些类。这样对于后面分析命令时很轻松。 1. MigrationRecorder类 这个类在django/db/migrations/recorder.py文件中,这个类是处理保存在数据库中的迁移记录。在生成的数据库中有django_migrations这样一张表,主要是处理这里的...
exists: (s)witch, (i)gnore, (w)ipe, (b)ackup,(a)bort.--trusted-host <hostname> Mark this host or host:port pair as trusted, even though it does not have valid or anyHTTPS.--cert <path> Path to PEM-encoded CA certificate bundle. If provided, overrides the default. See 'SSL...
pip install -ihttps://mirrors.aliyun.com/pypi/simple/<package_name> 或永久更改 pip 默认源(推荐在配置文件中修改): pip config set global.index-urlhttps://mirrors.aliyun.com/pypi/simple/ 15:分发本地构建的库 如果你自己开发了一个 Python 包,并希望在本地测试安装,可以先打包成 whl 或 tar.gz...
# manage_path: F:\spug-3.0\spug-3.0\spug_api\manage.py # base_dir: F:\spug-3.0\spug-3.0\spug_api # another_manage_path: F:\spug-3.0\spug-3.0\spug_api\another_manage.py pathlib from pathlib import Path manage_path = Path("manage.py").resolve() # 绝对路径 ...
`add_output` will check for conflicts and # raise errors if an output with the same name already exists in # the configuration but has different data_type or dims property. if output['name'] not in output_names: auto_complete_model_config.add_output(output) auto_complete_model_config.set...
However, the link isn't added if there's an existing file with the same name or a link to that file already exists in the project. If you attempt to link to a file that already exists in the project folders, the file is added as a normal file and not as a link. To convert a ...