pip install from a bundle does not respect order of requirements in manifest.txt

[meconlin]

Problem

pip install from a bundle does not respect order of requirements in the manifest file.

Reproduce

Make a simple requirements.txt file that contains

PyYAML==3.10
ua-parser==0.3.2

Create a bundle from that file

pip bundle small_bundle.pybundle -r requirements.txt

It produces the following manifest

# This is a pip bundle file, that contains many source packages
# that can be installed as a group.  You can install this like:
#     pip this_file.zip
# The rest of the file contains a list of all the packages included:
# These packages were installed to satisfy the above requirements:
PyYAML==3.10
ua-parser==0.3.2

You can easily install these requirements in the correct order using

pip install -r requirements.txt
...
Successfully installed PyYAML ua-parser

You will fail to install these requirement using the bundle. It attempts to install ua-parser first and fail due to PyYAML dependency.

pip install small_bundle.pybundle
...
ImportError: No module named yaml

[qwcode]

sorry to say, bundles are going away most likely. not enough momentum. nobody is handling bugs for it.

I should be able to just do this: pip install ua-parser==0.3.2
(and have it install yaml as a dependency due to the install_requires relationship https://github.com/tobie/ua-parser/blob/master/setup.py#L55)

but I can't, because ua-parser is trying to import yaml before the dependency can be processed
https://github.com/tobie/ua-parser/blob/master/setup.py#L22

but I guess the maintainers are aware of this oddity, and have these instructions

pip install pyyaml ua-parser

they could also use setup_requires to declare the need for yaml, which would grab yaml before trying to run install (and the yaml import)