$ echo "foo = f'{bar}'" | python lint.py --pyflakes
Traceback (most recent call last):
File "lint.py", line 405, in <module>
for lint_warning in lint(stdin_lines, lint_settings):
File "lint.py", line 238, in lint
w = pyflakes_checker.Checker(tree)
File "contrib/pyflakes/checker.py", line 294, in __init__
self.handleChildren(tree)
File "contrib/pyflakes/checker.py", line 567, in handleChildren
self.handleNode(node, tree)
File "contrib/pyflakes/checker.py", line 609, in handleNode
handler(node)
File "contrib/pyflakes/checker.py", line 567, in handleChildren
self.handleNode(node, tree)
File "contrib/pyflakes/checker.py", line 608, in handleNode
handler = self.getNodeHandler(node.__class__)
File "contrib/pyflakes/checker.py", line 462, in getNodeHandler
self._nodeHandlers[node_class] = handler = getattr(self, nodeType)
AttributeError: 'Checker' object has no attribute 'JOINEDSTR'
Due to old version of pyflakes