Lazy logger message string evaluation

Question

I\'m using standard python logging module in my python application:

import logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(\"log\")
whi         


        

Answer 1

If you depend only on accessing global state attributes, you can instantiate a python class and lazify it by using the __str__ method:

class get_lazy_debug(object):
    def __repr__(self):
        return ' '.join(
                str(i) for i in range(20)
            )

# Allows to pass get_lazy_debug as a function parameter without 
# evaluating/creating its string!
get_lazy_debug = get_lazy_debug()

logger.debug( 'Stupid log message', get_lazy_debug )

Related:

1. Conditionally evaluated debug statements in Python
2. What are metaclasses in Python?