"Requested runtime not available for this stack" - Dokku

04 Dec 2014 While using Dokku, I was getting the following error message: Requested runtime (python-2.7.8) is not available for this stack (cedar-14).

This was due to a connection error between my docker container and the internet. To determine this, I ran "docker images" and got the image id of "programium/buildstep", then got into a container with the following command: sudo docker run -t -i <your image id> /bin/bash

Once in the container, I ran:
curl http://lang-python.s3.amazonaws.com/cedar/runtimes/python-2.7.8.tar.gz -s

If that is unsuccessful, that should confirm it's a connection issue.

This was the solution to the problem: http://www.paulsprogrammingnotes.com/2014/12/rebuilding-buildstep-image-for-dokku.html

Rebuilding Buildstep Image For Dokku From Behind Proxy

02 Dec 2014

I had to change the buildstep image’s docker file to add my proxy. This is because the buildstep image required a proxy before the build to download the python buildpack.

I was rebuilding the buildstep image for dokku with these instructions: https://github.com/progrium/dokku/commit/9ebf453b72cab3a16ea261284236bb7c20ca3a1a#diff-04c6e90faac2675aa89e2176d2eec7d8R101

I’m behind a proxy, so I was getting this error when I ran “sudo make build”:

Cloning into ‘heroku-buildpack-multi’… fatal: unable to access ‘https://github.com/ddollar/heroku-buildpack-multi.git/’: Failed to connect to github.com port 443: Connection timed out

The solution? Replace the Dockerfile in the root of the folder you git cloned with this:

FROM progrium/cedarish:cedar14 MAINTAINER Jeff Lindsay <progrium@gmail.com> ENV http_proxy http://proxy.myproxy.com:8080/ ENV https_proxy http://proxy.myproxy.com:8080/ ADD ./stack/configs/etc-profile /etc/profile ADD ./builder/ /build RUN xargs -L 1 /build/install-buildpack /tmp/buildpacks < /build/config/buildpacks.txt

Troubleshooting Pip Timeout - Python

01 Dec 2014 Timeout: (<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x27330d0>, 'Connection to pypi.python.org timed out. (connect timeout=15)')

If you're installing several requirements from a requirements.txt file, it helps to use "-v" after your pip install command to figure out which module has the timeout. Most likely, it's trying to download a module from a URL that doesn't exist.

django-admin2

29 Nov 2014 This project looks similar more similar to Flask-Admin than regular Django Admin: https://github.com/pydanny/django-admin2

There's an example admin app here: https://github.com/pydanny/django-admin2/tree/develop/example

NULL values excluded from NOT IN - SQLAlchemy+SQLite

26 Nov 2014 Solution: AND column IS NOT NULL

Example: query.filter(or_(~self.column.in_(value), self.column == None))

This thread explains "SQL Server in treating NULL as a value": http://stackoverflow.com/questions/11491831/null-values-are-excluded-why

Github Asking For Password After Adding SSH Key

25 Nov 2014

Run: git remote -v

If the output has a URL that starts with https://github.com and not git@github.com, you need to change that by running a command similar to this: git remote set-url origin git@github.com:pawl/flask-admin.git

https://help.github.com/articles/changing-a-remote-s-url/#switching-remote-urls-from-ssh-to-https

Guide To Syncing Fork With Original Project

21 Nov 2014 https://help.github.com/articles/syncing-a-fork/

From my fork, I ran these commands:

git remote add upstream https://github.com/mrjoes/flask-admin.git
git fetch upstream
git merge upstream/master
git push

Create new branch and sync with upstream (change the bolded text):

git remote add upstream https://github.com/mrjoes/flask-admin.git
git fetch upstream
git checkout -b issue_xxxx upstream/master

https://docs.djangoproject.com/en/1.6/internals/contributing/writing-code/working-with-git/#working-on-a-ticket

Auto-Fixing Syntax Guideline Problems With Autopep8 - Python

18 Nov 2014 find . -name '*.py' -exec autopep8 --in-place '{}' \;
https://github.com/hhatto/autopep8/issues/30#issuecomment-22458121

Configuring Notepad++ For Python

16 Nov 2014

On the Settings->"Preferences", "Tab Settings" tab, I set "[Default]" at Tab size: 8, uncheck Replace by space; and set "Python" to uncheck Use default value, Tab size: 4, check Replace by space. This causes inserts into a python source to use 4 spaces for indents, and indent with spaces instead of tabs.

If I end up with any tabs in the source, I use Edit->Blank Operations->TAB to Space to convert them. I also clean up trailing blanks with Edit->Blank Operations->Trim Trailing Space.

I install and use the pep8 package to verify standard formatting.

http://www.reddit.com/r/Python/comments/2mfrn6/python_in_notepad/cm3tdj5

Redirecting From Within Helper Functions - Flask

15 Nov 2014

from flask import Flask, redirect from werkzeug.routing import RoutingException, HTTPException app = Flask(__name__) @app.route('/') def hello_world(): def helper_function(): # Attempt #1 # this obviously won't work: return redirect('www.google.com') # the program would just return 'Hello World!' # Attempt #2 # THIS IS PERMANENT!: raise RequestRedirect('example2') # your browser will cache the status 301 and ALWAYS redirect # explanation: http://stackoverflow.com/a/16371787/1364191 # Attempt #3 class RequestRedirect(HTTPException, RoutingException): """Raise if the map requests a redirect. This is for example the case if `strict_slashes` are activated and an url that requires a trailing slash. The attribute `new_url` contains the absolute destination url. The attribute `code` is returned status code. """ def __init__(self, new_url, code=301): RoutingException.__init__(self, new_url) self.new_url = new_url self.code = code def get_response(self, environ): return redirect(self.new_url, self.code) raise RequestRedirect('example3', code=302) helper_function() return 'Hello World!' @app.route('/example2') def example2(): return 'Example 2' @app.route('/example3') def example3(): return 'Example 3' if __name__ == '__main__': app.run(host="0.0.0.0", port=9999, debug=True)

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