Fix flake8 violations

1 files changed, 2 insertions, 2 deletions

diff --git a/sphinx/pycode/__init__.py b/sphinx/pycode/__init__.py
index 6c8cd725e..c908b076e 100644
--- a/sphinx/pycode/__init__.py
+++ b/sphinx/pycode/__init__.py
@@ -9,11 +9,11 @@
 """
 
 import re
+from importlib import import_module
 from io import StringIO
 from os import path
 from typing import Any, Dict, IO, List, Tuple, Optional
 from zipfile import ZipFile
-from importlib import import_module
 
 from sphinx.errors import PycodeError
 from sphinx.pycode.parser import Parser
@@ -114,7 +114,7 @@ class ModuleAnalyzer:
         try:
             filename, source = cls.get_module_source(modname)
             if source is not None:
-                obj = cls.for_string(source, modname, filename if filename is not None else '<string>')
+                obj = cls.for_string(source, modname, filename or '<string>')
             elif filename is not None:
                 obj = cls.for_file(filename, modname)
         except PycodeError as err: