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.