1 files changed, 49 insertions, 0 deletions
diff --git a/pylint/checkers/unsupported_version.py b/pylint/checkers/unsupported_version.py
new file mode 100644
index 000000000..917d64cba
--- /dev/null
+++ b/pylint/checkers/unsupported_version.py
@@ -0,0 +1,49 @@
+# Copyright (c) 2021 Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
+
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
+
+"""Checker for features used that are not supported by all python versions
+indicated by the py-version setting.
+"""
+
+from astroid import nodes
+
+from pylint.checkers import BaseChecker
+from pylint.checkers.utils import check_messages
+from pylint.interfaces import IAstroidChecker
+from pylint.lint import PyLinter
+from pylint.utils import get_global_option
+
+
+class UnsupportedVersionChecker(BaseChecker):
+    """Checker for features that are not supported by all python versions
+    indicated by the py-version setting.
+    """
+
+    __implements__ = (IAstroidChecker,)
+    name = "unsupported_version"
+    msgs = {
+        "W1601": (
+            "F-strings are not supported by all versions included in the py-version setting",
+            "using-f-string-in-unsupported-version",
+            "Used when the py-version set by the user is lower than 3.6 and pylint encounters "
+            "a f-string.",
+        ),
+    }
+
+    def open(self) -> None:
+        """Initialize visit variables and statistics."""
+        py_version = get_global_option(self, "py-version")
+        self._py36_plus = py_version >= (3, 6)
+
+    @check_messages("using-f-string-in-unsupported-version")
+    def visit_joinedstr(self, node: nodes.JoinedStr) -> None:
+        """Check f-strings"""
+        if not self._py36_plus:
+            self.add_message("using-f-string-in-unsupported-version", node=node)
+
+
+def register(linter: PyLinter) -> None:
+    """Required method to auto register this checker"""
+    linter.register_checker(UnsupportedVersionChecker(linter))