Add sys.version_info guard to import-error (#4468)

Author: cdce8p

ChangeLog

@@ -38,6 +38,8 @@ modules are added.
 
   Closes #3389
 
+* Don't emit ``import-error`` if import guarded behind ``if sys.version_info >= (x, x)``
+
 
 What's New in Pylint 2.8.2?
 ===========================

pylint/checkers/imports.py

@@ -135,6 +135,19 @@ def _ignore_import_failure(node, modname, ignored_modules):
         if submodule in ignored_modules:
             return True
 
+    # ignore import failure if guarded by `sys.version_info` test
+    if isinstance(node.parent, astroid.If) and isinstance(
+        node.parent.test, astroid.Compare
+    ):
+        value = node.parent.test.left
+        if isinstance(value, astroid.Subscript):
+            value = value.value
+        if (
+            isinstance(value, astroid.Attribute)
+            and value.as_string() == "sys.version_info"
+        ):
+            return True
+
     return node_ignores_exception(node, ImportError)
 
 

tests/functional/i/import_error.py

@@ -26,3 +26,12 @@
 
 # pylint: disable=no-name-in-module
 from functional.s.syntax_error import toto # [syntax-error]
+
+# Don't emit import-error if guarded behind `sys.version_info`
+import sys
+
+if sys.version_info >= (3, 9):
+    import zoneinfo
+
+if sys.version_info[:2] >= (3, 9):
+    import zoneinfo