One file Python GUI apps

Created to experiment with the PySimple GUI library. A collection of simple one file apps.

1. Unit converter
2. Stopwatch
3. Calculator
4. YouTube downloader

1. Clone repository
2. Install required libraries pip install -r requirements.txt
3. Run any app via terminal python converter.py

Converts along 3 categories: Mass, Length and Time. Able to convert both ways (e.g kg to pounds and pounds to kg). Easily expandable to more units.

Able to lap, stop and reset.

Allows to download a video from YouTube in best, worst quality and as an audio track. Potential error can come from the pytube library, specifically
pytube.exceptions.RegexMatchError: get_throttling_function_name: could not find match for multiple.
To avoid this you need to alter the pytube library file, as noted in this SO issue