当从git repo进行pip安装时，为什么＃egg = foo

Question

当我从git repo安装“pip install -e ...”时，我必须指定＃egg = somename或pip抱怨。例如：

pip install -e git://github.com/hiidef/oauth2app.git#egg=oauth2app

这个“蛋”字符串有什么意义？

Answer 1

每个pip install -h“egg”字符串是作为安装的一部分签出的目录

Answer 2

您必须包含＃egg = Package，因此pip知道该URL的内容。见https://pip.pypa.io/en/stable/reference/pip_install/#vcs-support

more on eggs

Answer 3

https://pip.pypa.io/en/stable/reference/pip_install/#vcs-support说：

  

url后缀“egg = - ”的“项目名称”组件由pip在其依赖逻辑中用于标识   在pip下载和分析元数据之前的项目。该   蛋名称的可选“版本”组件不是功能性的   重要。它只是提供了一个关于什么版本的人类可读线索   正在使用中。对于setup.py不在项目根目录中的项目，   使用“子目录”组件。 “子目录”组件的值   应该是从项目的根目录到setup.py的路径   位于。

由此我推断egg值仅用于依赖性检查，因此我认为，按照惯例，应该使用包名称（即some-pypi-package-name），而不是任何包含的文件夹（即{{1} }）

Answer 4

一个鸡蛋就是some bundled python code。在git网址中，egg是项目名称。 VCS Support

通常，我们从Pypi安装python软件包，因此您仅指定软件包名称和版本（如果未指定，则假定为最新版本）。然后，Pypi搜索您想要的鸡蛋，然后pip安装该鸡蛋。 Traceback (most recent call last): File "test6.py", line 93, in <module> x_attended = Attendancetable.create(classid = 'IT_20141', date = str(datetime.now()).split(' ')[0] + times, userid = x) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 5580, in create inst.save(force_insert=True) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 5727, in save pk_from_cursor = self.insert(**field_dict).execute() File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 1622, in inner return method(self, database, *args, **kwargs) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 1693, in execute return self._execute(database) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2355, in _execute return super(Insert, self)._execute(database) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2118, in _execute cursor = database.execute(self) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2724, in execute return self.execute_sql(sql, params, commit=commit) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2718, in execute_sql self.commit() File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2509, in __exit__ reraise(new_type, new_type(*exc_args), traceback) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2711, in execute_sql cursor.execute(sql, params or ()) File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 250, in execute self.errorhandler(self, exc, value) File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler raise errorvalue peewee.IntegrityError: (1452, 'Cannot add or update a child row: a foreign key constraint fails (`AAS`.`attendanceTable`, CONSTRAINT `fk_attendanceTable_1` FOREIGN KEY (`UserId`) REFERENCES `userTable` (`userid`))') Traceback (most recent call last): File "test6.py", line 93, in <module> x_attended = Attendancetable.create(classid = 'IT_20141', date = str(datetime.now()).split(' ')[0] + times, userid = x) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 5580, in create inst.save(force_insert=True) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 5727, in save pk_from_cursor = self.insert(**field_dict).execute() File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 1622, in inner return method(self, database, *args, **kwargs) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 1693, in execute return self._execute(database) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2355, in _execute return super(Insert, self)._execute(database) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2118, in _execute cursor = database.execute(self) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2724, in execute return self.execute_sql(sql, params, commit=commit) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2718, in execute_sql self.commit() File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2509, in __exit__ reraise(new_type, new_type(*exc_args), traceback) File "/home/user/.local/lib/python2.7/site-packages/peewee.py", line 2711, in execute_sql cursor.execute(sql, params or ()) File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 250, in execute self.errorhandler(self, exc, value) File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler raise errorvalue peewee.IntegrityError: (1452, 'Cannot add or update a child row: a foreign key constraint fails (`AAS`.`attendanceTable`, CONSTRAINT `fk_attendanceTable_1` FOREIGN KEY (`UserId`) REFERENCES `userTable` (`userid`))') 将安装最新发布的egg，而pip install celery将安装一个包含相同celery软件包的不同鸡蛋，并从celery的setup.py中列出为Redis依赖项的所有软件包中安装最新的egg。

使用git和gitlab路径，您可以指定pip install celery[redis]。 /{user|group}/{repository}.git@{tag}#egg={package-name}和#egg=celery之间是有区别的，但是它们都来自相同的源代码。

“标签”除实际标签外，还可以是分支或提交哈希。如果未指定，则假定为#egg=celery[redis]。

例如，master将检出master分支并进行安装。即使您指定了版本号，在安装中也不会考虑。 版本号被忽略

通过git或其他VCS网址进行安装时，您将需要查找所需版本的标签或哈希。例如，git+https://github.com/celery/celery.git#egg=celery==4.3.0将检出标记为“ v4.3.0”的提交，然后从该源代码安装该软件包。假设维护人员没有过分地错误标记他们的存储库，则可以得到所需的版本。