无法再使用pip安装旧版本

Question

I'n using pip 1.5.1 which worked fine up until today.

Now, I'm trying to install a requirements.txt in a fresh virtualenv, and for many packages it can no longer find specific old version for most packages.

$ pip install django-endless-pagination==1.1 
Downloading/unpacking django-endless-pagination==1.1
  Could not find a version that satisfies the requirement django-endless-pagination==1.1 (from versions: 2.0)
  Some externally hosted files were ignored (use --allow-external to allow).
Cleaning up...
No distributions matching the version for django-endless-pagination==1.1

What do I need to do to get this to work again? Upgrading my app to use all the latest versions of all its packages is out of the question.

Update: This works fine in pip 1.4.1. It's the newer version of pip that's causing it to fail.

Answer 1

From PIP 1.5 changelog :

BACKWARD INCOMPATIBLE

pip no longer will scrape insecure external urls by default nor will it install externally hosted files by default. Users may opt into installing externally hosted or insecure files or urls using --allow-external PROJECT and --allow-unverified PROJECT

So in this case following ought to work the same way as old PIP:

pip install django-endless-pagination==1.1 \
--allow-all-external --allow-unverified django-endless-pagination 

(There is no --allow-all-unverified , each unverified project name must be specified)

In case of using requirements.txt , it should be specified like this:

--allow-external django-endless-pagination
--allow-unverified django-endless-pagination

django-endless-pagination==1.1

Answer 2

In this case, you can use the URL of the appropriate zip file as input to pip install ::

pip install https://github.com/frankban/django-endless-pagination/archive/v1.1.zip

Of course, not every package will have such a URL available, but most do.

I've occasionally used this to install the latest-greatest master, since in some cases the cheeseshop didn't have Python 3 ready packages yet.

Answer 3

因为PyPI上的版本是2.0，并且pip现在尝试尊重维护者希望您使用给定版本的事实。