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I am currently using cvxpy for my project. When I solve an optimization problem, I have the option to turn the verbose flag on using prob.solve(solver=cvx.CVXOPT, verbose=True). When I do that, the logger starts printing the DEBUG level log messages to the console.

I understand that it is because of the following section in cvxpy source code.

LOGGER = logging.getLogger("__cvxpy__")
LOGGER.propagate = False
LOGGER.setLevel(logging.INFO)
_stream_handler = logging.StreamHandler(sys.stdout)
_stream_handler.setLevel(logging.INFO)
_formatter = logging.Formatter(
    fmt="(CVXPY) %(asctime)s: %(message)s", datefmt="%b %d %I:%M:%S %p"
)
_stream_handler.setFormatter(_formatter)
LOGGER.addHandler(_stream_handler)

How do I redirect the messages to a file without hacking the original source code? Can there be a setter method? TIA

Omar Shehab
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1 Answers1

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cvxpy doesn't supply any direct option to print log to a file, but rather it uses sys.stdout.

You can, however, redirect sys.stdout into a file instead of the console. To do that see: Redirect stdout to a file in Python? or Temporarily Redirect stdout/stderr for example.

You redirect output into a file in your program right before the .solve() call, and it should print the log into a file. The easiest way is with contextlib.redirect_stdout

That way when you call to solve with verbose=True, the sys.stdout that mentioned in the block of code you mentioned will redirect to a file instead of the console. If you're not familiar with stdin, stdout and stderr I would recommend to have a quick read about them first.

Roim
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