5.7.0 console=False cause error with Flask

[Shurelol]

flask output server banner by echo() in click\utils.py

in 5.7.0, if console=False in spec, the param file in echo() will be None and cause error

5.6.2 works fine

[bwoodsend]

You can't write to stdout in windowed mode because sys.stdout is None. See https://pyinstaller.org/en/v5.7.0/CHANGES.html#incompatible-changes.

[rokm]

I've opened issue with click (pallets/click#2415) - as they are advertising click.utils.echo as replacement for print, they should be properly handling the case when console is unavailable.

[Shurelol]

thanks for your replay

as for now, my solution is that creat class NullWriter and set sys.stdout and sys.stderr in my program

class NullWriter:
    softspace = 0
    encoding = 'UTF-8'

    def write(*args):
        pass

    def flush(*args):
        pass

    # Some packages are checking if stdout/stderr is available (e.g., youtube-dl). For details, see #1883.
    def isatty(self):
        return False

sys.stdout = NullWriter()
sys.stderr = NullWriter()

[rokm]

It's probably better to use sys.stdout = open(os.devnull, "w") and sys.stderr = open(os.devnull, "w") as in #7325 to get fully-compliant file-like interface instead of using the old NullWriter.

[bwoodsend]

That said, you really should not build any kind of web server with console=False. If someone tries to hack your website, all the tell tale exceptions in your logs as they feel out vulnerabilities to exploit will be lost to you.