Some Python tools.
A "context manager" imposes a beginning and end on some process that can cause problems if interrupted midway through. In the case of file I/O, if a file is opened for reading or writing and then not closed properly, it can be left in a locked state. A context manager (initiated by the with keyword) ensure that the file is closed in any case. Example
with open('questions_and_answers.json', 'r') as f: