Coding Blog

Using autopep8 with Visual Studio Code

by flandersen

Posted on July 11, 2020

autopep8 automatically formats Python code to conform to the PEP 8 style guide. It uses the pycodestyle utility to determine what parts of the code needs to be formatted. autopep8 is capable of fixing most of the formatting issues that can be reported by pycodestyle. – https://pypi.org/project/autopep8/

Open your project folder in VScode.

Install autopep8 onto your system or virtualenv.

pip install autopep8

Now, add the following lines to .vscode/settings.json:

{
    "python.pythonPath": "d:\\PyTestProj\\.venv\\Scripts\\python.exe",
    "python.linting.pep8Enabled": true,
    "python.formatting.provider": "autopep8"
}

Important: Add a comma at the end of the first conifg.

In VScode, press CTRL+Shift+P which will then show you a list of commands. “autopep8” should be the first item. Acknowledge selection with the ENTER.

Rename VMDK Disks on ESXi

by flandersen

Posted on May 02, 2020

Open a console to the ESXi host.

vmkfstools --server -E "[MyStorage] MyVM/Disk_2.vmdk" "[SCADA] MyVM/Data.vmdk"

The disk name must be changed in the respective *.vmx file of the VM, like e.g. MyVM.vmx.

Configure Sound Devices in Windows 10

by flandersen

Posted on April 29, 2020

In Windows 10, it is not easy to find the dialog where you can configure the sound devices, e.g.:

• set default devices
• define recording level
• configure microphone amplification

For making things easier, you can put a batch file in reach executing:

"C:\WINDOWS\system32\rundll32.exe" shell32.dll,Control_RunDLL mmsys.cpl,,recording

Jekyll build and serve commands

by flandersen

Posted on February 23, 2019

I use Jekyll to create my webpage.

# Install the dependencies specified in your Gemfile

bundle install

# Respectively update dependencies with

bundle update

# build jekyll page

bundle exec jekyll build

# serve jekyll page (host address overrides url in _config.yml)

bundle exec jekyll serve --host 192.168.1.30 --port 8080

For more info about Jekyll, see https://jekyllrb.com/

Start Python in Virtual Environment (virtualenv)

by flandersen

Posted on February 23, 2019

Virtual environments in Python are used to decouple the dependencies of multiple python projects by putting them into a project sub-directory. It is not to be confused with Virtual Machines, which can isolate code execution from the host system, but in contrast require a separate operating system and a lot more system resources.

# goto project directory

cd my_project

# create virtual environment

$ python -m venv .venv

# activate the virtual environment (linux)

source .venv/bin/activate

# activate the virtual environment (windows powershell)

.venv/Scripts/Activate.ps1

# create a file named requirements.txt

echo "requests==2.18.3" >> requirements.txt
echo "beautifulsoup4==4.6.0" >> requirements.txt
echo "isoweek==1.3.3" >> requirements.txt

pip install -r requirements.txt

The dependencies can now be found in the sub-folder .venv.

For further informations about using virtual environments in Python:
https://packaging.python.org/guides/installing-using-pip-and-virtualenv/

Git - Merge branch into master

by flandersen

Posted on February 23, 2019

Merging a Git branch locally can be done the following.

Source: changing_index_page
Target: master

# listing branches (* = current branch)

$ git branch
* changing_index_page
  master

# checkout target branch

$ git checkout master
$ git merge changing_index_page
 59 files changed, 181 insertions(+), 809 deletions(-)

# delete branch

$ git branch -d changing_index_page
Deleted branch changing_index_page (was 11c2e2d).

Atlassian has a nice Git tutorial: https://www.atlassian.com/git

Copy files from Linux console to Synology NAS

by flandersen

Posted on February 23, 2019

Copying files from the linux console to a Synology NAS can be done by using SCP.

# scp [options] <source> <target>

# -P: port number (default: 22)

scp -P 8022 FHEM-20190223_162640.tar.gz fhem@my-synology:/volume1/backups/fhem

For further information about SCP commands, see:
https://www.garron.me/en/articles/scp.html

Delete text rows using regular expressions

by flandersen

Posted on February 20, 2019

This tip is useful if you work with text files (e.g. log files, CSV files …) and want to delete rows containing specific keywords or patterns. Using any program that supports Regular Expressions (short regex) makes this job pretty easy.

Delete rows containing keyword/pattern:

Regex:   ^.*keyword.*$
Replace: <empty string>

Delete rows NOT containing keyword/pattern:

Regex:   ^(?!.*keyword.*).+$
Replace: <empty string>

Read more for an example with Notepad++.

Long-Term recordings with Wireshark

by flandersen

Posted on September 16, 2016

Recording the network traffic via the Wireshark GUI results in a single big file. This is unpractical for obvious reasons. By using the terminal program TShark.exe in the Wireshark program folder, you start a customized recording.

tshark -i 1 -a duration:86400 -b duration:3600 -w "c:\recordings\new.pcap"

Change channel of Busch-Jaeger via HTTP-GET

by flandersen

Posted on December 25, 2015

The internet radio Busch-Jaeger 8216U allows to change channel via HTTP-GET.