Make pipenv work with the venv install scheme if it is detected

news/5096.bugfix.bugfix

@@ -0,0 +1,2 @@
+Adjust pipenv to work with the newly added `venv` install scheme in Python.
+First check if `venv` is among the available install schemes, and use it if it is. Otherwise fall back to the `nt` or `posix_prefix` install schemes as before. This should produce no change for environments where the install schemes were not redefined.

pipenv/environment.py

@@ -7,7 +7,7 @@
 import site
 import sys
 from pathlib import Path
-from sysconfig import get_paths, get_python_version
+from sysconfig import get_paths, get_python_version, get_scheme_names
 
 import pkg_resources
 
@@ -174,6 +174,15 @@ def _replace_parent_version(self, path, replace_version):
  return os.path.join(base, leaf)
  return path
 
+ @cached_property
+ def install_scheme(self):
+ if "venv" in get_scheme_names():
+ return "venv"
+ elif os.name == "nt":
+ return "nt"
+ else:
+ return "posix_prefix"
+
  @cached_property
  def base_paths(self):
  # type: () -> Dict[str, str]
@@ -213,9 +222,8 @@ def base_paths(self):
  try:
  paths = self.get_paths()
  except Exception:
- install_scheme = "nt" if (os.name == "nt") else "posix_prefix"
  paths = get_paths(
- install_scheme,
+ self.install_scheme,
  vars={
  "base": prefix,
  "platbase": prefix,
@@ -236,9 +244,8 @@ def base_paths(self):
  paths.update(self.get_lib_paths())
  paths["scripts"] = self.script_basedir
  if not paths:
- install_scheme = "nt" if (os.name == "nt") else "posix_prefix"
  paths = get_paths(
- install_scheme,
+ self.install_scheme,
  vars={
  "base": prefix,
  "platbase": prefix,
@@ -266,9 +273,8 @@ def script_basedir(self):
  # type: () -> str
  """Path to the environment scripts dir"""
  prefix = make_posix(self.prefix.as_posix())
- install_scheme = "nt" if (os.name == "nt") else "posix_prefix"
  paths = get_paths(
- install_scheme,
+ self.install_scheme,
  vars={
  "base": prefix,
  "platbase": prefix,