Using @logged and @traced together

Release:1.0.1

• Add logging and tracing to a class
• Add logging and tracing to a function

Add logging and tracing to a class

# my_module.py

from autologging import logged, traced


@logged
@traced
class MyClass:

   def __init__(self, value):
      self.__log.info("I like %s.", value)
      self._value = value

   def my_method(self, arg, keyword=None):
      return "%s, %s, and %s" % (arg, self._value, keyword)

>>> import logging, sys
>>> from autologging import TRACE
>>> logging.basicConfig(level=TRACE, stream=sys.stdout,
...     format="%(levelname)s:%(name)s:%(funcName)s:%(message)s")
>>> from my_module import MyClass
>>> my_obj = MyClass("ham")
TRACE:my_module.MyClass:__init__:CALL *('ham',) **{}
INFO:my_module.MyClass:__init__:I like ham.
TRACE:my_module.MyClass:__init__:RETURN None
>>> my_obj.my_method("spam", keyword="eggs")
TRACE:my_module.MyClass:my_method:CALL *('spam',) **{'keyword': 'eggs'}
TRACE:my_module.MyClass:my_method:RETURN 'spam, ham, and eggs'
'spam, ham, and eggs'

Add logging and tracing to a function

Warning

Although the @logged and @traced decorators will “do the right thing” regardless of the order in which they are applied to the same function, it is recommended that @logged always be used as the innermost decorator.

This is because @logged simply sets the logger member and then returns the original function, making it safe to use in combination with any other decorator.

# my_module.py

from autologging import logged, traced


@traced
@logged
def my_function(arg, keyword=None):
   my_function._log.info("my message")
   return "%s and %s" % (arg, keyword)

>>> import logging, sys
>>> from autologging import TRACE
>>> logging.basicConfig(level=TRACE, stream=sys.stdout,
...     format="%(levelname)s:%(name)s:%(funcName)s:%(message)s")
>>> from my_module import my_function
>>> my_function("spam", keyword="eggs")
TRACE:my_module:my_function:CALL *('spam',) **{'keyword': 'eggs'}
INFO:my_module:my_function:my message
TRACE:my_module:my_function:RETURN 'spam and eggs'
'spam and eggs'