1 files changed, 11 insertions, 30 deletions
diff --git a/sphinx/config.py b/sphinx/config.py
index 353268e38..a6d070e3f 100644
--- a/sphinx/config.py
+++ b/sphinx/config.py
@@ -11,25 +11,22 @@
 import re
 import traceback
 import types
-import warnings
 from collections import OrderedDict
 from os import path, getenv
 from typing import (
     Any, Callable, Dict, Generator, Iterator, List, NamedTuple, Set, Tuple, Union
 )
+from typing import TYPE_CHECKING
 
-from sphinx.deprecation import RemovedInSphinx40Warning
 from sphinx.errors import ConfigError, ExtensionError
 from sphinx.locale import _, __
 from sphinx.util import logging
 from sphinx.util.i18n import format_date
-from sphinx.util.osutil import cd
-from sphinx.util.pycompat import execfile_
+from sphinx.util.osutil import cd, fs_encoding
 from sphinx.util.tags import Tags
 from sphinx.util.typing import NoneType
 
-if False:
-    # For type annotation
+if TYPE_CHECKING:
     from sphinx.application import Sphinx
     from sphinx.environment import BuildEnvironment
 
@@ -39,9 +36,11 @@ CONFIG_FILENAME = 'conf.py'
 UNSERIALIZABLE_TYPES = (type, types.ModuleType, types.FunctionType)
 copyright_year_re = re.compile(r'^((\d{4}-)?)(\d{4})(?=[ ,])')
 
-ConfigValue = NamedTuple('ConfigValue', [('name', str),
-                                         ('value', Any),
-                                         ('rebuild', Union[bool, str])])
+
+class ConfigValue(NamedTuple):
+    name: str
+    value: Any
+    rebuild: Union[bool, str]
 
 
 def is_serializable(obj: Any) -> bool:
@@ -74,10 +73,6 @@ class ENUM:
             return value in self.candidates
 
 
-# RemovedInSphinx40Warning
-string_classes = [str]  # type: List
-
-
 class Config:
     """Configuration file abstraction.
 
@@ -316,7 +311,9 @@ def eval_config_file(filename: str, tags: Tags) -> Dict[str, Any]:
     with cd(path.dirname(filename)):
         # during executing config file, current dir is changed to ``confdir``.
         try:
-            execfile_(filename, namespace)
+            with open(filename, 'rb') as f:
+                code = compile(f.read(), filename.encode(fs_encoding), 'exec')
+                exec(code, namespace)
         except SyntaxError as err:
             msg = __("There is a syntax error in your configuration file: %s\n")
             raise ConfigError(msg % err) from err
@@ -439,22 +436,6 @@ def check_confval_types(app: "Sphinx", config: Config) -> None:
                                           default=type(default)))
 
 
-def check_unicode(config: Config) -> None:
-    """check all string values for non-ASCII characters in bytestrings,
-    since that can result in UnicodeErrors all over the place
-    """
-    warnings.warn('sphinx.config.check_unicode() is deprecated.',
-                  RemovedInSphinx40Warning, stacklevel=2)
-
-    nonascii_re = re.compile(br'[\x80-\xff]')
-
-    for name, value in config._raw_config.items():
-        if isinstance(value, bytes) and nonascii_re.search(value):
-            logger.warning(__('the config value %r is set to a string with non-ASCII '
-                              'characters; this can lead to Unicode errors occurring. '
-                              'Please use Unicode strings, e.g. %r.'), name, 'Content')
-
-
 def check_primary_domain(app: "Sphinx", config: Config) -> None:
     primary_domain = config.primary_domain
     if primary_domain and not app.registry.has_domain(primary_domain):