[Cryptography-dev] Help on ERROR, please.

[白 岩]

Hi, I'm using python2.7 and need to install this moudel.
I installed it with command : pip install cryptography .
but I got this :

  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'

I am  at  the end of someone's rope.

Thanks for your help.
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