Merge branch 'master' into python-set-comprehension

Author: lpozo

concurrency-overview/README.md

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+# Interacting With Python
+
+This folder contains the code examples for the [Interacting With Python](https://realpython.com/interacting-with-python/) tutorial.

concurrency-overview/cpu_mp.py

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+greeting = "Hello, World!"
+print(greeting)
+print("Printing from a file.")

concurrency-overview/cpu_non_concurrent.py

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+These files are used in the tutorial [NumPy Practical Examples: Useful Techniques](https://realpython.com/numpy-example-useful-practical-techniques/).
+
+The various csv files contain data that is uses to create and populate various NumPy arrays in both the main tutorial and in the various embedded exercises. The tutorial_code.ipynb is a Jupyter Notebook containing the code used in the tutorials.