Multiple constraints dependencies does not consider the python version

[zen-xu]

• 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: macos
• Poetry version: 1.1.13

Issue

I am developing a project which compacts with py2 and py3. But py3 depends on a package, which also depends on a package I need. So I use multiple constraints dependencies to specify this package. But poetry will solve failed.

This is a little confusing, let me show you an example.

Here is my external package dependency

[tool.poetry]
name = "module_a"
version = "0.1.0"
description = ""

[tool.poetry.dependencies]
python = "^3.7"
requests = "^2.0"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

Here is my project dependency

[tool.poetry]
name = "my_project"
version = "0.1.0"
description = ""

[tool.poetry.dependencies]
python = "^2.7 | ^3.7"
requests = [
  {version = "^1.0", python="^2.7"},
  {version = "^2.0", python="^3.7"}
]
module_a = { path = "../module_a", python="^3.7" }

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

So dependencies of my_project should be like

py2:
  requests: ^1.0
py3:
  requests: ^2.0
  module_a:
    requests: ^2.0

However, poetry thinks requests should depend on ^1.0, even though I have specified py2 use ^1.0 and py3 use ^2.0

[dimbleby]

pretty sure this is going to be a duplicate of #5506, certainly it looks similar