Pip install cryptography fails on py36

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1

Dear builders,

I’m trying to pip install cryptography, essentially, and it works just great on py37 and py38. For py36 I get an error that I’m missing a Rust compiler. It seems py36 tries to build from source whereas on pypi I find wheels for py36, py37, py38. Why does it try to build from source on py36, or am I not understanding the issue here? Is the environment py36 somehow different from the others?

PR, for context

Build success/failure here (depending on python version)
https://travis-ci.org/github/SAP/cloud-pysec/builds/760937377

Pypi wheel seems to be py36+ compatible?

Thanks in advance.
Paul

2

Your pip version is probably old and doesn’t understand ABI3 tags in wheels. Upgrade it first.

3

In the .travis.yml file (it’s in the PR), there’s already this command:

   - pip install -U tox pip

That should do it, right?

4

Tox creates separate virtualenvs, you probably want newer pip there. So upgrade virtualenv because it has a specific version of pip bundled.

1 Like
5

@webknjaz thanks, very helpful of you! This resolved the issue.

6

@pletnes I am facing the same issue and tried to update pip and virtualenv, however my error hasn’t been resolved. Could you share, where you updated what? Thank you

7

Have a look at the blame. Did this help? It boils down to

before_install:
  - python -m pip install --upgrade virtualenv