Merge branch 'master' into input-output-update

Author: brendaweles

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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+# Speed Up Your Python Program With Concurrency
+
+This folder contains the sample code for the [Speed Up Your Python Program With Concurrency](https://realpython.com/python-concurrency/) tutorial.
+
+To use this code, first create and activate a [virtual environment](https://realpython.com/python-virtual-environments-a-primer/). Then, install the required libraries into it:
+
+```sh
+$ python -m venv venv/
+$ source venv/bin/activate
+(venv) $ python -m pip install -r requirements.txt
+```
+
+This will ensure you have the required Python packages.