#29 Responsive Bar Charts with Bokeh, Flask, and Python 3
Python Bytes - Podcast tekijän mukaan Michael Kennedy and Brian Okken - Maanantaisin
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Python Bytes 29
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Brian #1: Responsive Bar Charts with Bokeh, Flask and Python 3
- by Matt Makai at fullstackpython.com
- A walkthrough example of putting together a flask app that uses Bokeh bar charts to visualize data.
- All steps included, no previous experience with Flask or Bokeh required.
- Nice explanation of what the code does without going into too much detail.
- Good jumping off point for further learning, but complete enough to be useful right away.
Michael #2: Zappa Serverless Python Web Services
- Zappa makes it super easy to build and deploy all Python WSGI applications on AWS Lambda + API Gateway
- Think of it as "serverless" web hosting for your Python apps.
- That means infinite scaling, zero downtime, zero maintenance - and at a fraction of the cost of your current deployments!
- Better still, with Zappa you only pay for the milliseconds of server time that you use, so it's many orders of magnitude cheaper than VPS/PaaS hosts and in most cases, it's completely free. Plus, there's no need to worry about load balancing or keeping servers online ever again.
- Asynchronous Task Execution:
from flask import Flask
from zappa.async import task
app = Flask(__name__)
@task
def make_pie():
""" This takes a long time! """
ingredients = get_ingredients()
pie = bake(ingredients)
deliver(pie)
@app.route('/api/order/pie')
def order_pie():
""" This returns immediately! """
make_pie()
return "Your pie is being made!"
Brian #3: Using a local cache for pip packages
- In https://pythonbytes.fm/24, Local package store, we talked about using pip to cache pypi projects to allow offline installation:
$ pip download --cachedir [HTML_REMOVED]
$ pip install --no-index --find-links=/tmp/wheelhouse somePackage
- Well, Dominic does us one better by wrapping these commands in a couple of aliases.
- However, his version uses
pip install
--``download
, which has been deprecated. Here’s a version with the new syntax:alias pipcache='pip download --cache-dir ${HOME}/.pip-packages'
alias pipinstall='pip install --no-index --find-links=file://${HOME}/.pip-packages/'
Michael #4: Building game AI using ML: Working with TensorFlow, Keras, and the Intel MKL in Python
- From the ActivePython guys
- a classic arcade space shooter game that features enemies powered by machine learning
- we decided to build a Neural Network to drive the behaviour of the enemies in the game
- For the game part of things, we’re using PyGame
- In the training mode, the enemies fire randomly, and then each shot taken by the enemy is recorded as a hit or a miss along with its initial relative position/velocity values. Every one of these shots becomes a row in the training matrix and the network is trained in “realtime” after every row is added so you can see the network build and develop as you train.
- LESSONS LEARNED
- Choosing the right data to train your network is important.
- “Prepping” your data is key.
- Experiment with network topology.
- Visualization is important.
Brian #5: Debug Test Failures With Pdb
- by Raphael Pierzina
- Debugging code with pytest, using:
- --pdb to jump into the debugger at the point of failure
- -x to stop after first failure
- --lf to re-run all the tests that failed last time
- Note: Yes. All this and more is covered in Python Testing with pytest.
- Shameless plug for my book. Raphael is one of the technical reviewers.
- Thank you, Raphael!
Michael #6: Monitoring my VOIP provider with Home Assistant
- Integrating it into Home Assistant: Use home-assistant.io as a home automation platform in my house.
- It’s written in Python, open source, and has a large community surrounding it.
- Unfortunately, there wasn’t anything already built for my Cisco ATA.
- Decided to write, an open source my first python module called pyciscsospa you can download it and use it for your own ATA as well.
- Receive a push notification on my phone when the phone lines go down and come back up