Issue/1427/isort shouldnt move import comments

isort/output.py

@@ -272,7 +272,7 @@ def _with_from_imports(
             if "*" in from_imports and config.combine_star:
                 import_statement = wrap.line(
                     with_comments(
-                        comments,
+                        _with_star_comments(parsed, module, list(comments or ())),
                         f"{import_start}*",
                         removed=config.ignore_comments,
                         comment_prefix=config.comment_prefix,
@@ -364,7 +364,7 @@ def _with_from_imports(
                 if "*" in from_imports:
                     output.append(
                         with_comments(
-                            comments,
+                            _with_star_comments(parsed, module, list(comments or ())),
                             f"{import_start}*",
                             removed=config.ignore_comments,
                             comment_prefix=config.comment_prefix,
@@ -529,3 +529,11 @@ def is_comment(line):
             new_output.append("")
         new_output.append(line)
     return new_output
+
+
+def _with_star_comments(parsed: parse.ParsedContent, module: str, comments: List[str]) -> List[str]:
+    star_comment = parsed.categorized_comments["nested"].get(module, {}).pop("*", None)
+    if star_comment:
+        return comments + [star_comment]
+    else:
+        return comments

isort/parse.py

@@ -222,12 +222,7 @@ def file_contents(contents: str, config: Config = DEFAULT_CONFIG) -> ParsedConte
             import_string, comment = parse_comments(line)
             comments = [comment] if comment else []
             line_parts = [part for part in _strip_syntax(import_string).strip().split(" ") if part]
-            if (
-                type_of_import == "from"
-                and len(line_parts) == 2
-                and line_parts[1] != "*"
-                and comments
-            ):
+            if type_of_import == "from" and len(line_parts) == 2 and comments:
                 nested_comments[line_parts[-1]] = comments[0]
 
             if "(" in line.split("#", 1)[0] and index < line_count:

tests/unit/test_regressions.py

@@ -632,3 +632,16 @@ def test_isort_should_be_able_to_add_independent_of_doc_string_placement_issue_1
         show_diff=True,
         add_imports=["os"],
     )
+
+
+def test_comments_should_never_be_moved_between_imports_issue_1427():
+    """isort should never move comments to different import statement.
+    See: https://github.com/PyCQA/isort/issues/1427
+    """
+    assert isort.check_code(
+        """from package import CONSTANT
+from package import *  # noqa
+        """,
+        force_single_line=True,
+        show_diff=True,
+    )