Debug warnings in Python

warnings_debug.py

# Example of catching warnings to set debugging breakpoints; based on
# https://docs.python.org/3/library/warnings.html#testing-warnings
import warnings

# Toy function to throw a warning
def fxn():
    warnings.warn("deprecated", DeprecationWarning)

# Context manager to catch warning
with warnings.catch_warnings(record=True) as w:
    # In this case, debug a DeprecationWarning;
    # more warnings here: https://docs.python.org/3/library/warnings.html#warning-categories
    warnings.simplefilter("always", category=DeprecationWarning)
    # Insert code here that triggers a warning
    fxn()
    # If warning was thrown...
    if len(w) > 0:
        # Set breakpoint here for debugging
        print("You were warned!")