Python3 Sample code to run functions along with their arguments, when passed to Lambda as part of event object.

handler.py

# Python3 Sample code to run functions along with their  
# arguments, when passed to Lambda as part of event object
#
# Leia Renée 2022 Mit Licence
#
# leiarene20@gmail.com
# https://github.com/leiarenee
# https://www.linkedin.com/in/leia-renee/
# https://www.xn--rene-dpa.io/
#

import logging, sys
from datetime import datetime, timedelta
from timeit import default_timer as timer
from functools import wraps, partial

# Decorator Function
def safe_run(func=None, **dkwargs):
  global debug_mode
  if func is None:
    return partial(safe_run, **dkwargs)

  @wraps(func)
  def wrapper(*args, **kwargs):
    
    logging.debug(f'{func.__name__} function started with following paramaters: {args} {kwargs}')
    start = timer()
    
    result = func(*args, **kwargs)
    
    end = timer()
    process_time = '{:.2f}'.format((end - start) * 1000)
    logging.debug(f'{func.__name__} function ended in {process_time} milliseconds. returned {result}')
    return result

  return wrapper

# Task Function
def prepare_cron(minutes=10):
  """Prepares Cron Expression adding time interval with relative to current time
  Args:
      minutes (int): Time interval in minutes to be added to current time
  Returns:
      str: Cron Expression
  """

  dt = datetime.utcnow() + timedelta(minutes=minutes)
  return f'cron({dt.minute} {dt.hour} {dt.day} {dt.month} ? {dt.year})'

# Lambda Handler function
def handler(event, context):
  """Lambda Handler Function
  Args:
    event (dict): Input parameters passed from the proxy
    context (object): Lambda context object passed from the proxy
  Returns:
    dict: Body of the returning json
  """
  if not 'args' in event:
    event['args']=[]

  if not 'kwargs' in event:
    event['kwargs']={}

  result = safe_run(getattr(sys.modules[__name__], event['function']))(*event['args'],**event['kwargs'])

  return result

# For debugging
if __name__ == '__main__':
  print(handler({'function':'prepare_cron','kwargs':{'minutes':30}},{}))