On Wednesday, November 1, 2017, Steve Barnes <gadgetsteve@live.co.uk> wrote:
On 01/11/2017 06:54, Wes Turner wrote:
Suggestions to help to minimize unnecessary logged bandwidth use and even work with a closed loop LAN:
This reads from the filesystem:
import requests
This would read from the PyPi service over the network bandwidth:
#!pip install -U requests #%run pip install -U requests
#pip('install -U requests')
This doesn't work because you SHOULD restart the interpreter after running pip (because imports are cached):
import requests !pip install -U requests import requests
Some tips on running educational environments for beginners (optionally in a lab):
<Snipped a lot of good stuff>
One tip that I have used when teaching python in a closed, (sometimes internet free environment), was to pre-prepare by, in an on-line environment:
1. Create a virtual environment with the version of Python that I am going to be teaching on the target platform 2. Activate that environment 3. Ensure that I am On-line 4. Download the pip install packages that I know I will need by using `pip download` to download but not install the packages, ideally using the -r requirements.txt syntax, (plus any windows specific builds from Christoph Gohlke's site). 5. Go Off-line and run pip install with the downloaded package - if I hit any errors due to packages having unspecified dependencies add those to the requirements list and repeat from 3. (While I am at it I often log an issue with the package maintainer). 6. A fast, personal, run through my lesson plan to ensure that I haven't missed anything.
I normally also download a few goodies that might not be essential to the lesson but that can act as a teaser for the more interested students.
At the start of the first lesson I give the students the downloaded packages directory, usually on a USB key, and get them to pip install them while explaining the difference between local and on-line installation.
That works. You could also host the packages with devpi or just a static HTTP server. As a transparent cache, if you test your ``requirements.txt`` with each OS/CPU_architecture combination, DevPi will store and serve each package to everyone at once. So do you do (in a virtualenv): pip install --download ./dir -r requirements.txt And then pip install --no-index --find-links ./dir -r requirements.text Like in the pip docs? https://pip.pypa.io/en/stable/user_guide/#installing-from-local-packages DevPi can host package documentation. https://devpi.net/docs/devpi/devpi/stable/+doc/userman/devpi_packages.html#u... * GitLab Pages can host package documentation and any static HTML pages (e.g. the CPython docs) alongside **the source** https://docs.gitlab.com/ce/user/project/pages/index.html https://github.com/python/cpython/tree/3.6/Doc ReadTheDocs can host Sphinx docs and can be run in a Docker container for an internet-free LAN: https://github.com/rtfd/readthedocs-docker-images
I know that I could save having to get the students to run pip by packaging up the virtual environment as a portable, or using by pyInstaller, but having them run pip on the local downloads gives me a chance to explain how to do it in the wild.
AFAIU, YMMV with ``virtualenv --relocatable``; and it certainly doesn't do all combinations of OS and processor architecture: https://virtualenv.pypa.io/en/stable/userguide/#making-environments-relocata... itertools.combinations( ['win', 'mac', 'lin', '', '686', 'x86_64', 'ARM'], 2)
BTW while Docker is great for this it is a whole other learning experience, (plus getting it running with some corporate security & anti-virus can be quite a challenge).
Yeah, hosting Docker containers with Kubernetes across a couple extra workstations is initially more work than creating a few USB keys and waiting for everyone's virtualenvs to converge (with ``$ pip install``, ``!PIP_INDEX='' pip install``, and now a new pip GUI button press sequence).
These USB keys are often re-used by other co-workers as a getting started or after my computer got changed/re-imaged starting point.
Wouldn't it be create if, just like oldschool floppies, there was a way to break off the sliding write protect tab of a USB stick? https://en.wikipedia.org/wiki/USB_flash_drive_security#Malware_infections CD-ROM and DVD-ROM drives seem to be more and more scare these days.
-- Steve (Gadget) Barnes Any opinions in this message are my personal opinions and do not reflect those of my employer.
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