Issue:
$ pip install   tensorflow
Downloading/unpacking tensorflow
Could not find any downloads that satisfy the requirement tensorflow
Cleaning up…
No distributions at all found for tensorflow
Storing debug log for failure in /home/tommy/.pip/pip.log
Analysis:
pip version is too low, need to upgrade
$ pip –version
pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)

Solution:
sudo pip install pip -U $ sudo pip install   tensorflow
sudo: unable to resolve host tommy
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won’t be maintained after that date. A future version of pip will drop support for Python 2.7.
The directory ‘/home/tommy/.cache/pip/http’ or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo’s -H flag.
The directory ‘/home/tommy/.cache/pip’ or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo’s -H flag.
Collecting tensorflow
/usr/local/lib/python2.7/dist-packages/pip/_vendor/urllib3/util/ssl_.py:354: SNIMissingWarning: An HTTPS request has been made, but the SNI (Server Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
SNIMissingWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/urllib3/util/ssl_.py:150: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/urllib3/util/ssl_.py:150: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecurePlatformWarning
Downloading https://files.pythonhosted.org/packages/d2/ea/ab2c8c0e81bd051cc1180b104c75a865ab0fc66c89be992c4b20bbf6d624/tensorflow-1.13.1-cp27-cp27mu-manylinux1_x86_64.whl (92.5MB)
100% |████████████████████████████████| 92.5MB 170kB/s
Collecting numpy>=1.13.3 (from tensorflow)
Downloading https://files.pythonhosted.org/packages/c4/33/8ec8dcdb4ede5d453047bbdbd01916dbaccdb63e98bba60989718f5f0876/numpy-1.16.2-cp27-cp27mu-manylinux1_x86_64.whl (17.0MB)
100% |████████████████████████████████| 17.0MB 987kB/s
Collecting grpcio>=1.8.6 (from tensorflow)
Downloading https://files.pythonhosted.org/packages/b8/be/3bb6d8241b5ed1f8437169df53e7dd6ca986174e022585de15087a848c99/grpcio-1.19.0-cp27-cp27mu-manylinux1_x86_64.whl (10.7MB)
100% |████████████████████████████████| 10.7MB 1.4MB/s
Collecting keras-applications>=1.0.6 (from tensorflow)
Downloading https://files.pythonhosted.org/packages/90/85/64c82949765cfb246bbdaf5aca2d55f400f792655927a017710a78445def/Keras_Applications-1.0.7-py2.py3-none-any.whl (51kB)
100% |████████████████████████████████| 61kB 6.5MB/s
Collecting six>=1.10.0 (from tensorflow)