CODEWITHSUNDEEP
pythonlogging
Wizard
Wizard

Reputation: 22103

The literal format of format=" %(asctime)s - %(levelname)s - %(message)s")

I am learning to utilize logging rather than print to debug my code:

In [89]: logging.basicConfig(level=logging.DEBUG, format=" %(asctime)s - %(levelname)s - %(message)s")
In [90]: logging.debug("Some debugging details.")
 2018-08-28 16:41:15,371 - DEBUG - Some debugging details.

I tried to rewrite the format as literal format, 

In [5]: logging.basicConfig(level=logging.DEBUG, format=f" {(asctime)} - {(levelname)} - {(message)}")
NameError: name 'asctime' is not defined

or 

In [5]: logging.basicConfig(level=logging.DEBUG, format=f" {(asctime)} - {(levelname)} - {(message)}")
-------------------------------------------------------------------------
In [6]: logging.basicConfig(level=logging.DEBUG, format=f" {(asctime)s} - {(levelname)s} - {(message)s}")
  File "<fstring>", line 1
    ((asctime)s)
              ^
SyntaxError: invalid syntax

Is it possible to write a literal format of format=" %(asctime)s - %(levelname)s - %(message)s"?

Upvotes: 1

Views: 3415

Answers (1)

blhsing
blhsing

Reputation: 106792

No it isn't possible because the placeholder names in the logging format are interpreted by the logging module, while the expressions in the f-string are interpreted by the Python compiler itself, which is unaware of the meaning of the placeholder names understood only by the logging module.

Upvotes: 1

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