python logger - from socratica https://www.socratica.com/lesson/logging

pylogging.py

import logging
import math #since we'll need the sqrt fn

# Create and configure logger
LOG_FORMAT = "%(levelname)s %(asctime)s - %(message)s"
logging.basicConfig(filename = "log_file.log", level = logging.DEBUG, format = LOG_FORMAT, filemode = 'w')
# we'll call the logger without a name (aka 'root logger') because there are subtle issues with logger names (*what are they?*)
logger = logging.getLogger()

def quadratic_formula(a, b, c):
  """ Return the solution to ax^2 + bx + c = 0."""
  logger.info("quadratic_formula({0}, {1}, {2})".format(a, b, c))
  # Compute the discriminant: b^2 - 4ac
  logger.debug("# Compute the discriminant")
  disc = b**2 - 4*a*c

  # Compute the two roots
  logger.debug("# Compute the two roots")
  r1 = (-b + math.sqrt(disc))/(2*a)
  r2 = (-b - math.sqrt(disc))/(2*a)

  # Return the roots as a tuple
  logger.debug("# Return the roots as a tuple")
  return(r1, r2)

if __name__ == '__main__':
  a = int(input("For ax^2 + bx + c = 0, choose integer a: "))
  b = int(input("For ax^2 + bx + c = 0, choose integer b: "))
  c = int(input("For ax^2 + bx + c = 0, choose integer c: "))

  roots = quadratic_formula(a, b, c)
  print(f'logger level set to: {logger.level}')
  print(f"the roots are: {roots}")

# edge cases: 

# sqrt(negative #)
# roots = quadratic_formula(1, 0, 1)
# print(f"roots are: {roots}")

# divide by zero: a = 0
# roots = quadratic_formula(1, 1, 4)
# print(f"roots are: {roots}")

# Test the logger
#logger.debug("Harmless debug message.")
#logger.info("Just some useful info.")
#logger.warning("This is a warning message: eg I'm sorry, I can't do that.")
#logger.error("This is an error message: eg Did you try to divide by zero or carry out some other invalid action?")
#logger.critical("This is a critical message: eg The world is on fire!")