unused-import emitted for the right import names in function scopes.

Close #2928

ChangeLog

@@ -7,6 +7,10 @@ What's New in Pylint 2.4.0?
 
 Release date: TBA
 
+* ``unused-import`` emitted for the right import names in function scopes.
+
+  Close #2928
+
 * ``assignment-from-no-return`` not triggered for async methods.
 
   Close #2902

pylint/checkers/variables.py

@@ -841,7 +841,6 @@ def _check_imports(self, not_consumed):
                     if not self._is_type_checking_import(stmt):
                         self.add_message("unused-import", args=msg, node=stmt)
                 elif isinstance(stmt, astroid.ImportFrom) and stmt.modname != FUTURE:
-
                     if SPECIAL_OBJ.search(imported_name):
                         # Filter special objects (__doc__, __all__) etc.,
                         # because they can be imported for exporting.
@@ -1034,10 +1033,18 @@ def _check_is_unused(self, name, node, stmt, global_names, nonlocal_names):
                 if name in nonlocal_names:
                     return
 
+            qname = asname = None
             if isinstance(stmt, (astroid.Import, astroid.ImportFrom)):
                 # Need the complete name, which we don't have in .locals.
-                qname, asname = stmt.names[0]
-                name = asname or qname
+                if len(stmt.names) > 1:
+                    import_names = next(
+                        (names for names in stmt.names if name in names), None
+                    )
+                else:
+                    import_names = stmt.names[0]
+                if import_names:
+                    qname, asname = import_names
+                    name = asname or qname
 
             if _has_locals_call_after_node(stmt, node.scope()):
                 message_name = "possibly-unused-variable"

pylint/test/functional/unused_variable.py

@@ -53,3 +53,8 @@ def some_other_scope():
 def unused_import_from():
     from functools import wraps as abc # [unused-import]
     from collections import namedtuple # [unused-import]
+
+
+def unused_import_in_function(value):
+    from six import PY2, text_type # [unused-import]
+    return value.encode("utf-8") if PY2 else value

pylint/test/functional/unused_variable.txt

@@ -10,3 +10,4 @@ unused-variable:41:locals_example_defined_after:Unused variable 'value'
 unused-variable:46:locals_does_not_account_for_subscopes:Unused variable 'value'
 unused-import:54:unused_import_from:Unused wraps imported from functools as abc
 unused-import:55:unused_import_from:Unused namedtuple imported from collections
+unused-import:59:unused_import_in_function:Unused text_type imported from six