From 70687f5cb2806824133b8f880f1d69fecdbbd573 Mon Sep 17 00:00:00 2001
From: Jan Harkes <jaharkes@cs.cmu.edu>
Date: Thu, 10 Dec 2020 14:38:46 -0500
Subject: [PATCH] Fix fallback to other interpreters when specifying a
 patchlevel.

When a project specifies a narrow range for the supported python
versions, i.e. "python ~= 3.6.1" and the current interpreter falls
outside of that range, the fallback code fails to test an available
python3.6 interpreter because of a too strict a test.
---
 src/poetry/utils/env.py |  2 +-
 tests/utils/test_env.py | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/poetry/utils/env.py b/src/poetry/utils/env.py
index afaf001f55d..044816d4bbc 100644
--- a/src/poetry/utils/env.py
+++ b/src/poetry/utils/env.py
@@ -847,7 +847,7 @@ def create_venv(
                         supported_python
                     ):
                         continue
-                elif not supported_python.allows_all(
+                elif not supported_python.allows_any(
                     parse_constraint(python_to_try + ".*")
                 ):
                     continue
diff --git a/tests/utils/test_env.py b/tests/utils/test_env.py
index 981db92d54d..66c0bbd1da0 100644
--- a/tests/utils/test_env.py
+++ b/tests/utils/test_env.py
@@ -1093,3 +1093,35 @@ def test_env_finds_fallback_executables_for_generic_env(tmp_dir, manager):
 
     assert Path(venv.python).name == expected_executable
     assert Path(venv.pip).name == expected_pip_executable
+
+
+def test_create_venv_accepts_fallback_version_w_nonzero_patchlevel(
+    manager, poetry, config, mocker, config_virtualenvs_path
+):
+    if "VIRTUAL_ENV" in os.environ:
+        del os.environ["VIRTUAL_ENV"]
+
+    poetry.package.python_versions = "~3.5.1"
+    venv_name = manager.generate_env_name("simple-project", str(poetry.file.parent))
+
+    check_output = mocker.patch(
+        "subprocess.check_output",
+        side_effect=lambda cmd, *args, **kwargs: str(
+            "3.5.12" if "python3.5" in cmd else "3.7.1"
+        ),
+    )
+    m = mocker.patch(
+        "poetry.utils.env.EnvManager.build_venv", side_effect=lambda *args, **kwargs: ""
+    )
+
+    manager.create_venv(NullIO())
+
+    assert check_output.called
+    m.assert_called_with(
+        config_virtualenvs_path / "{}-py3.5".format(venv_name),
+        executable="python3.5",
+        flags={"always-copy": False, "system-site-packages": False},
+        with_pip=True,
+        with_setuptools=True,
+        with_wheel=True,
+    )