Installing Python packages with Pip in older systems —31 August 2014
Recently I had the pleasure of having to install Python packages with Pip in an old-ish Linux (Suse Enterprise). For example when trying to install Flask, this is what happened: My stack trace was something like this:
$ pip install flask -v Downloading/unpacking flask Could not fetch URL https://pypi.python.org/simple/flask/: connection error: [Errno 1] _ssl.c:493: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed Will skip URL https://pypi.python.org/simple/flask/ when looking for download links for flask Could not fetch URL https://pypi.python.org/simple/: connection error: [Errno 1] _ssl.c:493: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed Will skip URL https://pypi.python.org/simple/ when looking for download links for flask Cannot fetch index base URL https://pypi.python.org/simple/ Could not fetch URL https://pypi.python.org/simple/flask/: connection error: [Errno 1] _ssl.c:493: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed Will skip URL https://pypi.python.org/simple/flask/ when looking for download links for flask Could not find any downloads that satisfy the requirement flask Cleaning up... Removing temporary dir /tmp/virtualenv/build... No distributions at all found for flask
After some hours of trying to figure this out (perhaps updating the registered SSL certificates?), I was running out of time, and needed to find another way to get my packages installed.
First, I downloaded my Python dependencies to my own PC:
mkdir pip-cache
pip install -r requirements.txt --download pip-cache/
Next, copied the packages to the Linux box:
pscp.exe -r pip-cache janos@:tmp/
Finally, made pip on the Linux box use my cache of packages:
pip install -r requirements.txt --no-index --find-links ~/tmp/pip-cache
Although this is less than ideal, it’s not every day that I need to install Python packages, so I’m ok to do this on the odd occasion.