From df3a13fc617e8bcb1afcac64f8cf17cb685d6bf7 Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Tue, 19 Apr 2022 11:32:36 +0300
Subject: [PATCH] Move MISSING to the compat

---
 platformio/builder/tools/pioproject.py | 3 ++-
 platformio/compat.py                   | 4 ++--
 platformio/platform/board.py           | 5 +++--
 platformio/project/config.py           | 5 +----
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/platformio/builder/tools/pioproject.py b/platformio/builder/tools/pioproject.py
index 4bf848d9..425d6758 100644
--- a/platformio/builder/tools/pioproject.py
+++ b/platformio/builder/tools/pioproject.py
@@ -14,7 +14,8 @@
 
 from __future__ import absolute_import
 
-from platformio.project.config import MISSING, ProjectConfig, ProjectOptions
+from platformio.compat import MISSING
+from platformio.project.config import ProjectConfig, ProjectOptions
 
 
 def GetProjectConfig(env):
diff --git a/platformio/compat.py b/platformio/compat.py
index dc2ad9a1..43eb98dd 100644
--- a/platformio/compat.py
+++ b/platformio/compat.py
@@ -14,6 +14,7 @@
 
 # pylint: disable=unused-import,no-name-in-module
 
+import importlib.util
 import inspect
 import locale
 import sys
@@ -32,6 +33,7 @@ PY2 = sys.version_info[0] == 2  # DO NOT REMOVE IT. ESP8266/ESP32 depend on it
 IS_CYGWIN = sys.platform.startswith("cygwin")
 IS_WINDOWS = WINDOWS = sys.platform.startswith("win")
 IS_MACOS = sys.platform.startswith("darwin")
+MISSING = object()
 string_types = (str,)
 
 
@@ -56,8 +58,6 @@ def hashlib_encode_data(data):
 
 
 def load_python_module(name, pathname):
-    import importlib.util  # pylint: disable=import-outside-toplevel
-
     spec = importlib.util.spec_from_file_location(name, pathname)
     module = importlib.util.module_from_spec(spec)
     spec.loader.exec_module(module)
diff --git a/platformio/platform/board.py b/platformio/platform/board.py
index 65940962..2e998ac0 100644
--- a/platformio/platform/board.py
+++ b/platformio/platform/board.py
@@ -15,6 +15,7 @@
 import os
 
 from platformio import fs, telemetry, util
+from platformio.compat import MISSING
 from platformio.debug.exception import DebugInvalidOptionsError, DebugSupportError
 from platformio.exception import UserSideException
 from platformio.platform.exception import InvalidBoardManifest
@@ -34,14 +35,14 @@ class PlatformBoardConfig(object):
                 "Please specify name, url and vendor fields for " + manifest_path
             )
 
-    def get(self, path, default=None):
+    def get(self, path, default=MISSING):
         try:
             value = self._manifest
             for k in path.split("."):
                 value = value[k]
             return value
         except KeyError:
-            if default is not None:
+            if default != MISSING:
                 return default
         raise KeyError("Invalid board option '%s'" % path)
 
diff --git a/platformio/project/config.py b/platformio/project/config.py
index 2746899c..bc622317 100644
--- a/platformio/project/config.py
+++ b/platformio/project/config.py
@@ -21,7 +21,7 @@ import re
 import click
 
 from platformio import fs
-from platformio.compat import string_types
+from platformio.compat import MISSING, string_types
 from platformio.project import exception
 from platformio.project.options import ProjectOptions
 
@@ -38,9 +38,6 @@ CONFIG_HEADER = """
 """
 
 
-MISSING = object()
-
-
 class ProjectConfigBase(object):
 
     INLINE_COMMENT_RE = re.compile(r"\s+;.*$")