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@@ -32,14 +32,6 @@ def get_colors(colorize: bool = False) -> ANSIColors:
 
 
 def can_colorize() -> bool:
- if sys.platform == "win32":
- try:
- import nt
-
- if not nt._supports_virtual_terminal():
- return False
- except (ImportError, AttributeError):
- return False
  if not sys.flags.ignore_environment:
  if os.environ.get("PYTHON_COLORS") == "0":
  return False
@@ -58,6 +50,15 @@ def can_colorize() -> bool:
  if not hasattr(sys.stderr, "fileno"):
  return False
 
+ if sys.platform == "win32":
+ try:
+ import nt
+
+ if not nt._supports_virtual_terminal():
+ return False
+ except (ImportError, AttributeError):
+ return False
+
  try:
  return os.isatty(sys.stderr.fileno())
  except io.UnsupportedOperation:

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@@ -50,10 +50,47 @@ def test_colorized_detection_checks_for_environment_variables(self):
  with unittest.mock.patch("os.environ",
  {'FORCE_COLOR': '1', "PYTHON_COLORS": '0'}):
  self.assertEqual(_colorize.can_colorize(), False)
+ with unittest.mock.patch("os.environ", {}):
+ self.assertEqual(_colorize.can_colorize(), True)
+
  isatty_mock.return_value = False
  with unittest.mock.patch("os.environ", {}):
  self.assertEqual(_colorize.can_colorize(), False)
 
+ @force_not_colorized
+ @unittest.skipUnless(sys.platform == "win32", "Windows only")
+ def test_colorized_detection_checks_for_environment_variables_no_vt(self):
+ with (unittest.mock.patch("nt._supports_virtual_terminal", return_value=False),
+ unittest.mock.patch("os.isatty") as isatty_mock,
+ unittest.mock.patch("sys.flags", unittest.mock.MagicMock(ignore_environment=False)),
+ unittest.mock.patch("_colorize.can_colorize", ORIGINAL_CAN_COLORIZE)):
+ isatty_mock.return_value = True
+ with unittest.mock.patch("os.environ", {'TERM': 'dumb'}):
+ self.assertEqual(_colorize.can_colorize(), False)
+ with unittest.mock.patch("os.environ", {'PYTHON_COLORS': '1'}):
+ self.assertEqual(_colorize.can_colorize(), True)
+ with unittest.mock.patch("os.environ", {'PYTHON_COLORS': '0'}):
+ self.assertEqual(_colorize.can_colorize(), False)
+ with unittest.mock.patch("os.environ", {'NO_COLOR': '1'}):
+ self.assertEqual(_colorize.can_colorize(), False)
+ with unittest.mock.patch("os.environ",
+ {'NO_COLOR': '1', "PYTHON_COLORS": '1'}):
+ self.assertEqual(_colorize.can_colorize(), True)
+ with unittest.mock.patch("os.environ", {'FORCE_COLOR': '1'}):
+ self.assertEqual(_colorize.can_colorize(), True)
+ with unittest.mock.patch("os.environ",
+ {'FORCE_COLOR': '1', 'NO_COLOR': '1'}):
+ self.assertEqual(_colorize.can_colorize(), False)
+ with unittest.mock.patch("os.environ",
+ {'FORCE_COLOR': '1', "PYTHON_COLORS": '0'}):
+ self.assertEqual(_colorize.can_colorize(), False)
+ with unittest.mock.patch("os.environ", {}):
+ self.assertEqual(_colorize.can_colorize(), False)
+
+ isatty_mock.return_value = False
+ with unittest.mock.patch("os.environ", {}):
+ self.assertEqual(_colorize.can_colorize(), False)
+
 
 if __name__ == "__main__":
  unittest.main()

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@@ -0,0 +1,2 @@
+Allow to force color output on Windows using environment variables. Patch by
+Andrey Efremov.