Use the `logging` module for logging.

[jfjlaros]

The title is quite self-explanatory.

[martijnvermaat]

Related reading:

• Python standard library: logging module
• Python documentation: Logging HOWTO
• PEP 0391 -- Dictionary-Based Configuration For Logging
• Python Guide: Logging
• Django documentation: Logging (We don't use Django, but this provides some relevant insights anyway.)

[martijnvermaat]

SQLAlchemy Documentation: Configuring Logging

We currently configure the SQLAlchemy engine with echo=True if the Mutalyzer DEBUG setting is True. As per the above docs, we should probably always set echo=False (and set the loglevel for sqlalchemy.engine appropriately) if we start using Python logging properly.

[martijnvermaat]

Flask Documentation: Logging Application Errors

Flask has its own logger on the app object. See:

• flask.logging module
• flask.app module

[martijnvermaat]

Example of adding context information to our log messages (e.g., client IP address from the Flask request context): Adding context and formatting to our logs