Provide a way to supress progressbar, but display exceptions

I we provide the --quiet option, pip does not display exceptions like this:

        install_requires=get_install_requires(),
      File "/tmp/pip-build-QuFDf8/selectable-tbz/setup.py", line 7, in get_install_requires
        return [str(entry.req) for entry in requirements if not entry.editable]
      File "/home/modwork_vums_di995/lib/python2.7/site-packages/pip/req/req_file.py", line 31, in parse_requirements
        "parse_requirements() missing 1 required keyword argument: "
    TypeError: parse_requirements() missing 1 required keyword argument: 'session'

Please give us an option to supress the progressbar, but display exceptions.

Thank you.

[memory]

A little more forcefully this time since it clearly got lost in the mess above (two years ago, sigh):

Regardless of whether pip9 allows turning the progress bar off or not, the fact that --quiet suppresses FATAL ERRORS AND STACK TRACES cannot reasonably be described as anything other than a bug.

The linked message from the distutils-sig mailing list suggests that the full release of pip 10 is “one or two months away” in…October of 2017 (nearly five months ago). And even once 10 comes out of beta, it can be safely assumed that given the API differences that many shops will continue using pip9 for months or years to come as they prioritize their conversions.

@AvnerCohen if I managed to put together a PR for pip9 that fixed only this misbehavior, is there any chance at all that it would be accepted and released?

[memory]

+1 on this. Hilariously, I ran into this issue in the exact same context: installation of cffi failed in a jenkins build that didn’t have libffi.so available, and --quiet suppressed the error completely.

Adding an option to disable only the progress bar would be nice, but having --quiet suppress stack traces / fatal error output from inside pip seems like an outright bug. If I wanted to suppress all output including fatal errors, I already know how to use 2>&1 >/dev/null 😃