Can't install gensim with python 3.4 - amazon-web-services

Question

I cannot install gensim==3.5.0 in my elastic beanstalk environment (python 3.4). I get an error that gensim needs python >= 3.5 to run.
This was not a problem until a mid-day deployment today, that made only project code changes, nothing related to elastic beanstalk, requirements or settings.
At the same time, I'm succesfully running the same version in another identical environment. That means the same pip, same python version, same required dependencies.
I tried lowering the gensim requirement to gensim==0.13.4 which officially supports python 3.4, but I get the same error.
EDIT: I managed to make things work by installing gensim==0.10.0 and then redeploying with gensim=3.5.0. I still don't know the cause of the issue and the solution is not really a solution, so I'm still interested in insights.

Answer 1

Note that currently (July 2019), Python 3.4 itself will no longer be supported with fix releases. Per https://www.python.org/downloads/release/python-3410/:
Release Date: March 18, 2019
Python 3.4 has reached end-of-life. Python 3.4.10 is the final release
of 3.4.
Python 3.4.10 was released on March 18th, 2019.
Python 3.4.10 is the final release in the Python 3.4 series. As of
this release, the 3.4 branch has been retired, no further changes to
3.4 will be accepted, and no new releases will be made. This is standard Python policy; Python releases get five years of support and
are then retired.
If you're still using Python 3.4, you should consider upgrading to the
current version. Newer versions of Python have many new features,
performance improvements, and bug fixes, which should all serve to
enhance your Python programming experience.
That said, if you're truly getting an error about gensim's require Python level, truly rolling back to whatever version of gensim you were using successfully, previously, with Python 3.4 should work. (That might not need to go as far back as gensim-0.13.4.1, which is almost 2.5 years old, but if you're sure that's the version that was working for you, you could use that version.)
You should edit your question to show exactly what installation commands you've run, and exactly which message is received in response to which step, to more clearly indicate what's been tried, where the error is arising, and why a simple attempt to install-an-older-version might be getting a similar error message.