Python

Create Continuous Integration (CI) Pipeline in Gitlab Agenda What is Continuous Integration (CI)? What it is the application? How does a CI Pipeline work? What do I need for a CI Pipeline? What steps are necessary? Small Project in Python Server Configuration Python Project Gitlab CI Yaml File stages: - test python_test: stage: test image: python:3.9 script: - pip3 install pipenv - pipenv install - pipenv run python3 -m pytest Server Configuration Server Update # SSH Login ~ ssh root@IP-Adresse # Update Server root@server:~$ apt-get update && apt-get upgrade Create new user # Create new user root@server:~$ useradd -m -s /bin/bash youtube # Change Password root@server:~$ passwd youtube # Add user to sudo Group root@server:~$ usermod -aG sudo youtube Disable root access per ssh # Edit SSH Config youtube@server:~$ sudo vim /etc/ssh/sshd_config # inside vim /PermitRootLogin yes mit no ersetzen # on your keyboard :wq # Restart ssh service root@server:~$ sudo systemctl restart ssh Password-less login + Installation of Docker # on your Laptop / PC ~ ssh-copy-id youtube@server-IP # Login mit youtube ohne Passwort # Installation of Docker youtube@server:~$ sudo apt-get install -y docker.io # Adding user to docker group root@server:~$ usermod -aG docker $USER # Logout and login again Checking of docker installation # Testen der Docker Installation youtube@server:~$ docker ps # Beispiel Container starten youtube@server:~$ docker run hello-world Install Gitlab Runner # Start Gitlab Runner # Resource: https://docs.gitlab.com/runner/install/docker.html youtube@server:~$ docker run -d --name gitlab-runner --restart always -v /srv/gitlab-runner/config:/etc/gitlab-runner \ -v /var/run/docker.sock:/var/run/docker.sock \ gitlab/gitlab-runner:latest # Register Gitlab Runner-> write gitlab.com oder your Gitlab Instanz Resource: https://docs.gitlab.com/runner/register/ youtube@server:~$ docker run --rm -it -v /srv/gitlab-runner/config:/etc/gitlab-runner gitlab/gitlab-runner register Downloads Presentation Python Project Helpful Links https://docs.gitlab.com/ee/ci/README.html https://docs.pytest.org/en/stable/ https://docs.docker.com/ https://docs.gitlab.com/runner/install/docker.html https://docs.gitlab.com/runner/register/ Icons https://www.flaticon.com/authors/becr https://www.flaticon.com/autho https://www.flaticon.com/authors/freepik

How to create a tridiagonal matrix? What is a tridiagonal matrix? It typically looks like this: $$ \begin{array}{cccccccc} a_{11} & a_{12} & 0 & \cdots & \cdots & \cdots & \cdots & 0 \ a_{21} & a_{22} & a_{23} & \ddots & & & & \vdots \ 0 & a_{32} & a_{33} & a_{34} & \ddots & & & \vdots \ \vdots & \ddots & \ddots & \ddots & \ddots & \ddots & & \vdots \ \vdots & & \ddots & \ddots & \ddots & \ddots & \ddots & \vdots \ \vdots & & & \ddots & a_{76} & a_{77} & a_{78} & 0 \ \vdots & & & & \ddots & a_{87} & a_{88} & a_{89} \ 0 & \cdots & \cdots & \cdots & \cdots & 0 & a_{98} & a_{99} \end{array} $$ ...

Entering two commands in PyCharm simultaneously When you are working with matplotlib the default workflow is two create first the image itself with plt.plot() and then plt.show(). Those commands are usually entered after each other. However you can also enter them simultaneously by just concatenating them with a semicolon. So you can run plt.show([1,2,3]); plt.show() and the image if you run PyCharm in the scientific mode will popup immediately.

Working with Virtualenvs like pipenv is more than beneficial as you keep track easily of the different dependencies of your project and dont have to worry about your main python environment. However in during the development of your projects you might run into the situation that you require the shell for just verifying some small functions or run some scripts. The basic python shell provides is definitely suitable for this situation but using a shell like from ipython is even better. You can select last commands with the arrow keys and also have a nice highlighting, but how do you setup the ipython shell? Its straight forward: ...

Accessing the values of a relationship field in a Django Dashboard When you would like to group your instances of model by a category that stands in relationship to this model like the following: from django.db import models class model1(models.Model): name = models.CharField(max_length=256) def __str__(self): return self.name class model2(models.Model): some_other_name = models.CharField(max_length=256) name_model_1 = models.ForeignKey(model1, on_delete=models.CASCADE) def __str__(self): return self.some_other_name You might run into the problem that when you group the objects of your model2 by the field name_model_1 that you actually don’t get the exact values of this field. Instead you will be given the id of the belonging field, in this case name. But when you would like to visualise your data in a bar chart like the django extension django-controlcenter. In this case you can easily modify your queryset by just extending the string selection with the double underscore: ...

Downloading multiple PDFs in a batch depending on your browser can be a time consuming job, so the easiest way to do this properly and platform independent is simply to write a small python script 😃🐍 ...