Wrong sub-dependency version selected

• OS version and name: macOS, py3.8, py3.9
• Poetry version: 1.0.5

Reproduce

• poetry init
• poetry add beautifulsoup4

Installs sub-dep soupsieve==1.9.8 even though soupsieve==2.0.1 is available:

> poetry run pip freeze
beautifulsoup4==4.9.1
soupsieve==1.9.6

beautifulsoup4 has these lines in setup.py:

install_requires=["soupsieve>1.2"]
if sys.version_info.major == 2:
    install_requires.append("soupsieve<2.0")

ref: https://bazaar.launchpad.net/~leonardr/beautifulsoup/bs4/view/head:/setup.py#L11

poetry somehow picks up this restriction:

> poetry show --tree
beautifulsoup4 4.9.1 Screen-scraping library
├── soupsieve >1.2
└── soupsieve <2.0

and also shows the sub-dep as outdated:

> poetry show --outdated
soupsieve 1.9.6 2.0.1 A modern CSS selector implementation for Beautiful Soup.

This is all I know for now… I’ll look into the wheels, etc.

[dimaqq]

The tarball is a bit suspect, egg info has both restrictions, but setup.py has a conditional restriction.

tar xzf beautifulsoup4-4.9.1.tar.gz
...
ag soupsieve
...
beautifulsoup4-4.9.1/beautifulsoup4.egg-info/requires.txt
1:soupsieve>1.2
2:soupsieve<2.0
...
beautifulsoup4-4.9.1/setup.py
10:install_requires=["soupsieve>1.2"]
12:    install_requires.append("soupsieve<2.0")
...

If poetry evaluates tarball egg info, how should beautifulsoup4 author write their library so that poetry picks up correct sub-dependency versions for Python3 and Python2?

[dimaqq]

beautifulsoup4 project has since removed the Python major conditional entirely. I guess the original issue is now “gone”.