This course provides a quick Python overview. It is for experienced programmers looking for key Python essentials to get productive quickly.

The aim of this mini-course is to give experienced developers a clear and concise overview of the Python language, so they can understand and write Python code in as short a time as possible. There are many Python books, courses, and tutorials out there, but this one is different in a way that it provides only the bare minimum information to be productive, thereby making use of your existing programming knowledge and not wasting your time with unnecessary background information.

If you want to learn Python quickly, this is the course for you.

Python Quickstart for Experienced Programmers

# Reading a JSON file

A very common task in any language is reading, editing and writing a file. As a quick demo, we are going to write a full Python program that does the following:

- Reads a JSON file from disk
- De-serializes the data into a Python `dict`
- Modifies the `dict` by changing a value
- Serializes the `dict` back to JSON
- Writes the final JSON back to a file

Let's start by reading the file using Python's `open()` function, and printing the file contents.

Learn to read and write a JSON file with Python.


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Putting it Together: Read a JSON file

Reading a JSON file