FIX: Fix circular import problem

1 files changed, 2 insertions, 1 deletions

diff --git a/sphinx/pycode/parser.py b/sphinx/pycode/parser.py
index ec89a3616..d2e8fb976 100644
--- a/sphinx/pycode/parser.py
+++ b/sphinx/pycode/parser.py
@@ -19,7 +19,6 @@ from typing import Any, Dict, List, Optional, Tuple
 
 from sphinx.pycode.ast import ast  # for py37 or older
 from sphinx.pycode.ast import parse, unparse
-from sphinx.util.inspect import signature_from_ast
 
 
 comment_re = re.compile('^\\s*#: ?(.*)\r?\n?$')
@@ -262,6 +261,8 @@ class VariableCommentPicker(ast.NodeVisitor):
             self.finals.append(".".join(qualname))
 
     def add_overload_entry(self, func: ast.FunctionDef) -> None:
+        # avoid circular import problem
+        from sphinx.util.inspect import signature_from_ast
         qualname = self.get_qualname_for(func.name)
         if qualname:
             overloads = self.overloads.setdefault(".".join(qualname), [])