Fix conda integration detection of stdlib

3 files changed, 4 insertions, 2 deletions

diff --git a/isort/finders.py b/isort/finders.py
index 410442c2..5c23389c 100644
--- a/isort/finders.py
+++ b/isort/finders.py
@@ -190,6 +190,8 @@ class PathFinder(BaseFinder):
                     return self.sections.THIRDPARTY
                 if self.virtual_env and self.virtual_env_src in prefix:
                     return self.sections.THIRDPARTY
+                if os.path.normcase(prefix) == self.stdlib_lib_prefix:
+                    return self.sections.STDLIB
                 if self.conda_env and self.conda_env in prefix:
                     return self.sections.THIRDPARTY
                 if os.path.normcase(prefix).startswith(self.stdlib_lib_prefix):
diff --git a/isort/settings.py b/isort/settings.py
index dee036fe..5b8ea325 100644
--- a/isort/settings.py
+++ b/isort/settings.py
@@ -9,6 +9,7 @@ import configparser
 import enum
 import fnmatch
 import os
+import posixpath
 import re
 import sys
 import warnings
@@ -17,8 +18,6 @@ from functools import lru_cache
 from pathlib import Path
 from typing import Any, Callable, Dict, Iterable, List, Mapping, MutableMapping, Optional, Union
 
-import posixpath
-
 from .stdlibs import py3, py27
 from .utils import difference, union
 
diff --git a/test_isort.py b/test_isort.py
index 7efe3ab4..337d8f0a 100644
--- a/test_isort.py
+++ b/test_isort.py
@@ -3017,6 +3017,7 @@ def test_path_finder(monkeypatch) -> None:
         posixpath.join(third_party_prefix, "example_4" + ext_suffix),
         posixpath.join(os.getcwd(), "example_5.py"),
     }
+
     monkeypatch.setattr("isort.finders.exists_case_sensitive", lambda p: p in imaginary_paths)
     assert finder.find("example_1") == finder.sections.STDLIB
     assert finder.find("example_2") == finder.sections.THIRDPARTY