python3.4 install flask giving error message related to Jinja2 requirement

Question

I am trying to install flask, however I am getting the following error. It seems to be related to Jinja2 however when I do pip list and grep on Jinja you can see I manually installed that already and still getting this error message. Anyone know what is wrong and why I cant install flask

  Could not find a version that satisfies the requirement Jinja2>=2.10 (from flask) (from versions: 2.7.3, 2.8)
No matching distribution found for Jinja2>=2.10 (from flask)

Full install message

pip install flask
Looking in indexes: http://pyats-pypi.cisco.com/simple
Collecting flask
  Downloading https://files.pythonhosted.org/packages/7f/e7/08578774ed4536d3242b14dacb4696386634607af824ea997202cd0edb4b/Flask-1.0.2-py2.py3-none-any.whl (91kB)
    100% |\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588| 92kB 9.3MB/s 
Collecting Werkzeug>=0.14 (from flask)
  Downloading https://files.pythonhosted.org/packages/20/c4/12e3e56473e52375aa29c4764e70d1b8f3efa6682bef8d0aae04fe335243/Werkzeug-0.14.1-py2.py3-none-any.whl (322kB)
    100% |\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588| 327kB 12.5MB/s 
Collecting Jinja2>=2.10 (from flask)
  Could not find a version that satisfies the requirement Jinja2>=2.10 (from flask) (from versions: 2.7.3, 2.8)
No matching distribution found for Jinja2>=2.10 (from flask)

The Errors seems to be related to Jinja2, however I already have that installed so I'm confused.

pip list | grep Jinja2
Jinja2             2.8     

Answer 1

As the pypi server is by default pointing to your work hosted server. These are some steps which can help:

1. Uninstall the existing Jinja2 library using pip uninstall Jinja2 command
2. Download the Jinja2 wheel or tar file manually from the public pypi server
3. Install the Jinja2library from that file itself. Directly go to the location where have you downloaded the above file and type the following command pip install Jinja2-2.10.tar.gz or pip install Jinja2-2.10-py2.py3-none-any.whl based on which file have you downloaded.

This should install the 2.10 version of Jinja2 now. Let me know if it did not work.