Frank-Mich's Blog

Python Poetry Index Error – list index out of range

Posted on 2020/05/012020/05/01 by Frank-Mich L'Heureux

You run poetry and get this (undescriptive) error message.

[IndexError]
list index out of range

So far I’ve identified two things that you need to check.

Credentials: If you are installing packages from a private repository, make sure poetry credentials are right.
Presence of all required files in local packages: If you are installing a package from local files, make sure all files mentioned in the packages section of its pyproject.toml file are present. (I mostly got this error while building on Docker when forgetting to add them all in the Dockerfile.

python poetry 1.0.0 private repo issue fix

Posted on 2020/01/032020/01/03 by Frank-Mich L'Heureux

On December 12th 2019, poetry v1.0.0 was released. With it, came a bad surprise for me: My CI/CD jobs as well as my Docker image builds started failing.

After investigating, I’ve found out that the password key/value was now missing from the .config/pypoetry/auth.toml file. Digging some more, I’ve found out that poetry relies on a library called keyring to manage passwords.

Here is what I did to fix the problem.

First, I’ve noticed that poetry falls back to the previous method if keyring returns RuntimeError when it is called. Nice. It turns out that keyring comes with a backend aptly named “fail” which does that whatever the call is. So, it’s only a matter of configuring it.

As the keyring documentation states it, run python -c "import keyring.util.platform_; print(keyring.util.platform_.config_root())" to find where to put the configuration file. Then, in that directory, create keyringrc.cfg and put the following content in it:

[backend]                                    
default-keyring=keyring.backends.fail.Keyring

That’s it. Now you can call poetry config http-basic.... the same way you used to and the password will be stored in auth.tomllike before.

Opset – a python configuration library

Posted on 2019/09/272019/09/27 by Frank-Mich L'Heureux

Last week, my team open sourced the configuration library we have streamlined for the software components that we work on.

Opset – A library for simplifying the configuration of Python applications at all stages of deployment. [github] [pypi]

Recipe: GPG-agent forwarding

Posted on 2019/04/012019/04/01 by Frank-Mich L'Heureux

This is heavily inspired by https://wiki.gnupg.org/AgentForwarding but is going to be friendlier

Speeding a CI/CD pipeline over CircleCI

Posted on 2018/12/032018/12/03 by Frank-Mich L'Heureux

This post is annectodic, but I figured it could still be helpful in some way, so here I go.

Classic story. At work, the CircleCI CI/CD pipeline of the project I work on, as time went by, became slower and slower. Recently, it reached a bit over forty minutes. I worked on it and brought it back under ten minutes. Here is what I did.

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Python code formatters comparison: Black, autopep8 and YAPF

Posted on 2018/07/072022/01/28 by Frank-Mich L'Heureux

Following some discussions at work and the will of the team to adopt a python code formatter, I set out to explore some of them. No need to say, the contenders had to aim towards pep8 compliance. Here are my findings on three of them.
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AWS marketplace and no longer supported instance types

Posted on 2018/02/26 by Frank-Mich L'Heureux

I’ve been trying and trying to launch a Neo4j instance on the marketplace without success. It always gave me the nice “success” message, but when I went to the EC2 console: nothing!

A nice green “success” message even though it doesn’t work.

I finally decided to do it the hard way: manually. First step: select an instance type. I immediately try to select the same low cost instance I had picked in the marketplace (m3.medium) and to my surprise that type wasn’t there.

Instance type selection as per the Neo4j marketplace page.

Adding 1 + 1, I went back to the market place and tried with an instance type that still exists: m4.large… success!

So I don’t know who is to blame here, but here are my 2 questions to the internet:

Why do we get the success message even though it doesn’t work?
Why are unsupported instance types offered in the market place?

Python logging to stackdriver

Posted on 2017/09/192017/09/19 by Frank-Mich L'Heureux

I recently deployed a python application in google app engine / container engine. When I went to check the logs, everything was logged at the “ERROR” level even though my application uses python logging properly. As far as I know there are 2 ways to fix that:

Use the stackdriver client, which requires an additional dependency and somewhat binds your program to google app engine.
Format the logs in a way that stackdriver can parse them, which is easily configurable.

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Recipe: Testing multiple python versions with pyenv and tox

Posted on 2017/08/302017/08/30 by Frank-Mich L'Heureux

If you develop a ton of python applications and you need to test under a lot of different versions, and by a lot I mean overlapping major/minor versions (like 3.5.3 and 3.5.4), then a good option is to use pyenv. Along with tox, you can easily test your application against various major/minor versions.

Here is how to do it.
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