Exception: pip returned unsuccessfully

[bittlingmayer]

I just saw this error:

Adams-MacBook-Pro:lambda bittlingmayer$ lambda-uploader
λ Building Package
�� Unexpected error. Please report this traceback.
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/lambda_uploader/shell.py", line 173, in main
_execute(args)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/lambda_uploader/shell.py", line 73, in _execute
venv, cfg.ignore, extra_files)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/lambda_uploader/package.py", line 47, in build_package
pkg.build(ignore)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/lambda_uploader/package.py", line 68, in build
self.install_dependencies()
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/lambda_uploader/package.py", line 141, in install_dependencies
self._install_requirements()
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/lambda_uploader/package.py", line 208, in _install_requirements
raise Exception('pip returned unsuccessfully')
Exception: pip returned unsuccessfully

When I ran it again, there was no error, and the upload was successful.

pip is installed and working normally on my machine.

[martinb3]

Is this repeatable, or only happened once? We'd also need to see the output of trying to pip install the requirements for your project, as this exception is simply pip failing on your machine.

[jarosser06]

Along with what Martin mentioned we would need to see it run with Debug logs so we can see the pip failure.

[bittlingmayer]

I only saw it once. May make sense to change that error message to also surface the error message from the pip failure, so that next dev who follows the instruction to report the stacktrace will include it by default.

[jarosser06]

I was thinking it may be beneficial to do that as well so I'll look at getting that changed.

[brandond]

Easy to reproduce by trying to install a C-based Python module without the appropriate libraries and/or headers installed.