Python
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"Python is a high-level programming language with a specific design philosophy that emphasizes code readability, e.g. through the use of indentation. It's aim is to help programmers write clear, logical code for small and large-scale projects, and is described as a "batteries included" language due to its comprehensive standard library." (source: https://www.python.org/about/)

Philosophy and guidelines

- https://www.python.org/dev/peps/pep-0020/
- https://www.python.org/dev/peps/pep-0008/

Introductory material and tutorials

- https://realpython.com/learning-paths/python-basics/
- https://docs.python-guide.org/
- https://docs.python.org/3/tutorial/
- https://py-tutorial-de.readthedocs.io/de/python-3.3/ (German)

Helpful questions on Stack Overflow

- https://stackoverflow.com/questions/155609/whats-the-difference-between-a-method-and-a-function
- https://stackoverflow.com/questions/509211/understanding-slice-notation
- https://stackoverflow.com/questions/1977362/how-to-create-module-wide-variables-in-python
- https://stackoverflow.com/questions/16476924/how-to-iterate-over-rows-in-a-dataframe-in-pandas