How to use the pyflakes.messages.UnusedImport function in pyflakes

if not scope.importStarred and \
                   os.path.basename(self.filename) != '__init__.py':
                    # Look for possible mistakes in the export list
                    undefined = all_names.difference(scope)
                    for name in undefined:
                        self.report(messages.UndefinedExport,
                                    scope['__all__'].source, name)
            else:
                all_names = []

            # Look for imported names that aren't used.
            for value in scope.values():
                if isinstance(value, Importation):
                    used = value.used or value.name in all_names
                    if not used:
                        messg = messages.UnusedImport
                        self.report(messg, value.source, value.name)
                    for node in value.redefined:
                        if isinstance(self.getParent(node), ast.For):
                            messg = messages.ImportShadowedByLoopVar
                        elif used:
                            continue
                        else:
                            messg = messages.RedefinedWhileUnused
                        self.report(messg, node, value.name, value.source)

for name in undefined:
                        self.report(messages.UndefinedExport,
                                    scope['__all__'].source, name)

                # mark all import '*' as used by the undefined in __all__
                if scope.importStarred:
                    for binding in scope.values():
                        if isinstance(binding, StarImportation):
                            binding.used = all_binding

            # Look for imported names that aren't used.
            for value in scope.values():
                if isinstance(value, Importation):
                    used = value.used or value.name in all_names
                    if not used:
                        messg = messages.UnusedImport
                        self.report(messg, value.source, str(value))
                    for node in value.redefined:
                        if isinstance(self.getParent(node), ast.For):
                            messg = messages.ImportShadowedByLoopVar
                        elif used:
                            continue
                        else:
                            messg = messages.RedefinedWhileUnused
                        self.report(messg, node, value.name, value.source)

for name in undefined:
                        self.report(messages.UndefinedExport,
                                    scope['__all__'].source, name)

                # mark all import '*' as used by the undefined in __all__
                if scope.importStarred:
                    for binding in scope.values():
                        if isinstance(binding, StarImportation):
                            binding.used = all_binding

            # Look for imported names that aren't used.
            for value in scope.values():
                if isinstance(value, Importation):
                    used = value.used or value.name in all_names
                    if not used:
                        messg = messages.UnusedImport
                        self.report(messg, value.source, str(value))
                    for node in value.redefined:
                        if isinstance(self.getParent(node), ast.For):
                            messg = messages.ImportShadowedByLoopVar
                        elif used:
                            continue
                        else:
                            messg = messages.RedefinedWhileUnused
                        self.report(messg, node, value.name, value.source)

def apply_transformation(self, transformation_input):
        buffer_control, document, lineno, source_to_display, fragments, width, height = transformation_input.unpack()

        for row, col, msg, m in get_pyflakes_warnings(document.text, frozenset(buffer_control.buffer.session._locals)):
            # col = source_to_display(col)
            if isinstance(m, UnusedImport):
                continue

            if row == lineno:
                # TODO: handle warnings without a column
                fragments = explode_text_fragments(fragments)
                if col > len(fragments):
                    print("Error with pyflakes checker", col, len(fragments))
                    continue

                if col == len(fragments):
                    fragments += [('', ' ')]

                style, char = fragments[col]
                if col == document.cursor_position_col and lineno == document.cursor_position_row:
                    style += ' class:pygments.pyflakeswarning.cursor '
                else:

def unused_import_module_name(messages):
    """Yield line number and module name of unused imports."""
    pattern = r'\'(.+?)\''
    for message in messages:
        if isinstance(message, pyflakes.messages.UnusedImport):
            module_name = re.search(pattern, str(message))
            module_name = module_name.group()[1:-1]
            if module_name:
                yield (message.lineno, module_name)

# Look for possible mistakes in the export list
                    undefined = set(all) - set(scope)
                    for name in undefined:
                        self.report(
                            messages.UndefinedExport,
                            scope['__all__'].source,
                            name)
            else:
                all = []

            # Look for imported names that aren't used.
            for importation in scope.itervalues():
                if isinstance(importation, Importation):
                    if not importation.used and importation.name not in all:
                        self.report(
                            messages.UnusedImport,
                            importation.source,
                            importation.name)

def inject_tree_artifacts(
        self, artifacts: "Artifacts", tree: lib2to3.pytree.Node, text: str
    ) -> "Artifacts":
        a = typing.cast(UnsusedImportsArtifacts, artifacts)

        a.unused_imports = []

        ast_tree = ast.parse(text)
        warnings = pyflakes.checker.Checker(ast_tree)
        unused_imports = [
            i
            for i in warnings.messages
            if isinstance(i, pyflakes.messages.UnusedImport)
        ]
        for i in unused_imports:
            a.unused_imports.append(i.message_args[0])

        return typing.cast("Artifacts", a)

if not scope.importStarred and \
                   os.path.basename(self.filename) != '__init__.py':
                    # Look for possible mistakes in the export list
                    undefined = all_names.difference(scope)
                    for name in undefined:
                        self.report(messages.UndefinedExport,
                                    scope['__all__'].source, name)
            else:
                all_names = []

            # Look for imported names that aren't used.
            for value in scope.values():
                if isinstance(value, Importation):
                    used = value.used or value.name in all_names
                    if not used:
                        messg = messages.UnusedImport
                        self.report(messg, value.source, value.name)
                    for node in value.redefined:
                        if isinstance(self.getParent(node), ast.For):
                            messg = messages.ImportShadowedByLoopVar
                        elif used:
                            continue
                        else:
                            messg = messages.RedefinedWhileUnused
                        self.report(messg, node, value.name, value.source)

if not scope.importStarred and \
                   os.path.basename(self.filename) != '__init__.py':
                    # Look for possible mistakes in the export list
                    undefined = all_names.difference(scope)
                    for name in undefined:
                        self.report(messages.UndefinedExport,
                                    scope['__all__'].source, name)
            else:
                all_names = []

            # Look for imported names that aren't used.
            for value in scope.values():
                if isinstance(value, Importation):
                    used = value.used or value.name in all_names
                    if not used:
                        messg = messages.UnusedImport
                        self.report(messg, value.source, value.name)
                    for node in value.redefined:
                        if isinstance(self.getParent(node), ast.For):
                            messg = messages.ImportShadowedByLoopVar
                        elif used:
                            continue
                        else:
                            messg = messages.RedefinedWhileUnused
                        self.report(messg, node, value.name, value.source)