Poetry incorrectly resolves netmiko dependencies

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Docker python:3.6-alpine
• Poetry version: 0.12.11
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/dmfigol/ec86438a2e46b25b53f196f471caffbc

Issue

It seems that poetry incorrectly resolves netmiko dependencies. Here is the output with poetry in Docker (Python 3.6.7):

/ # poetry add netmiko
Skipping virtualenv creation, as specified in config file.
Using version ^2.3 for netmiko

Updating dependencies
Resolving dependencies... (26.2s)


Package operations: 15 installs, 0 updates, 0 removals

Writing lock file

  - Installing pycparser (2.19)
  - Installing asn1crypto (0.24.0)
  - Installing cffi (1.11.5)
  - Installing bcrypt (3.1.6)
  - Installing cryptography (2.5)
  - Installing pyasn1 (0.4.5)
  - Installing pynacl (1.3.0)
  - Installing paramiko (2.4.2)
  - Installing enum34 (1.1.6)   # enum34 is installed when it is not supposed to
  - Installing ipaddress (1.0.22)
  - Installing pyserial (3.4)
  - Installing pyyaml (3.13)
  - Installing scp (0.13.0)
  - Installing textfsm (0.4.1)
  - Installing netmiko (2.3.0)

Here is the output from pip when installing netmiko (enum34 is not installed):

(.test-venv) / # pip install netmiko
Collecting netmiko
...
Successfully installed asn1crypto-0.24.0 bcrypt-3.1.6 cffi-1.11.5 cryptography-2.5 netmiko-2.3.0 paramiko-2.4.2 pyasn1-0.4.5 pycparser-2.19 pynacl-1.3.0 pyserial-3.4 pyyaml-3.13 scp-0.13.0 six-1.12.0 textfsm-0.4.1
You are using pip version 10.0.1, however version 19.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
(.test-venv) / # pip freeze
asn1crypto==0.24.0
bcrypt==3.1.6
cffi==1.11.5
cryptography==2.5
netmiko==2.3.0
paramiko==2.4.2
pyasn1==0.4.5
pycparser==2.19
PyNaCl==1.3.0
pyserial==3.4
PyYAML==3.13
scp==0.13.0
six==1.12.0
textfsm==0.4.1

[matt2000]

Alternatively, if there were a way to tell poetry to explicitly prevent the installation of some package, that would help, at least.

[zupo]

I have exactly the same problem, openapi-core 0.11.1 is using sys.version_info to declare requirements and I get enum34 installed in Python 3.7 environment. Which fails spectacularly.

I know that the openapi-core package author should fix this by using Environmental Markers. But there hasn’t been a release in months.

Ideally, poetry would support temporarily fixing such broken packages by overriding their dependency declarations. Basically what was proposed in https://github.com/python-poetry/poetry/issues/1122#issuecomment-565433003 sounds absolutely epic.

Here’s a workaround for anyone interested:

1. run poetry lock
2. manually remove all mentions of enum34 from poetry.lock
3. run poetry install
4. repeat every time you add a new package, or update an existing one