Switch uses of __import__ to importlib.get_module()

The Python docs for __import__ recommend using importlib.get_module().

https://docs.python.org/3/library/functions.html#__import__

> Note: This is an advanced function that is not needed in everyday
> Python programming, unlike importlib.import_module().

As importlib.get_module() uses the Python module cache and returns the
module, this also allows simplifying many module cache checks of use of
sys.modules.

importlib.get_module() has been available since Python 3.3.

1 files changed, 2 insertions, 1 deletions

diff --git a/sphinx/ext/coverage.py b/sphinx/ext/coverage.py
index 24f51b856..7d53e7bb9 100644
--- a/sphinx/ext/coverage.py
+++ b/sphinx/ext/coverage.py
@@ -13,6 +13,7 @@ import glob
 import inspect
 import pickle
 import re
+from importlib import import_module
 from os import path
 from typing import Any, Dict, IO, List, Pattern, Set, Tuple
 
@@ -144,7 +145,7 @@ class CoverageBuilder(Builder):
                 continue
 
             try:
-                mod = __import__(mod_name, fromlist=['foo'])
+                mod = import_module(mod_name)
             except ImportError as err:
                 logger.warning(__('module %s could not be imported: %s'), mod_name, err)
                 self.py_undoc[mod_name] = {'error': err}