Pip install may be broken with update to cryptography

[nixonpjoshua]

Downloading/unpacking six>=1.5.2 from https://pypi.python.org/packages/67/4b/141a581104b1f6397bfa78ac9d43d8ad29a7ca43ea90a2d863fe3056e86a/six-1.11.0-py2.py3-none-any.whl#md5=866ab722be6bdfed6830f3179af65468 (from pyopenssl)
  Downloading six-1.11.0-py2.py3-none-any.whl
Downloading/unpacking cryptography>=1.9 from https://pypi.python.org/packages/d2/3a/0ea50d3ef952e6fa39e3f2a21da86b19b41c4666f5ecea0a1ab4d1990d1f/cryptography-2.1.tar.gz#md5=d716e69826d31a6006669b060584fb3f (from pyopenssl)
  Running setup.py (path:/tmp/pip_build_root/cryptography/setup.py) egg_info for package cryptography
    error in cryptography setup command: Invalid environment marker: python_version < '3'
    Complete output from command python setup.py egg_info:
    error in cryptography setup command: Invalid environment marker: python_version < '3'```

This error is new as of today and wasn't present yesterday with no changes on my end I'm running a pip install pyopenssl --upgrade inside a docker file.

I looked and today the cryptography library was updated so it seems like there was a change there which broke this library since its looking to install any version greater than 1.9

I would appreciate any help or comments on why this might be happening

[alex]

What version of setuptools do you have?

Can you try upgrading to the latest version of setuptools and seeing if that resolves the issue?

I'm going to close this, if that doesn't resolve it, levae a comment and I'll reopen.

[epixilog]

This is a common issue due to outdated version of pip.

Try considering this command:
pip install -U pip setuptools

[bonsoirval]

epixilog is correct. His solution worked for me. Thanks