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

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)

if existing and not self.differentForks(node, existing.source):

            parent_stmt = self.getParent(value.source)
            if isinstance(existing, Importation) and isinstance(parent_stmt, ast.For):
                self.report(messages.ImportShadowedByLoopVar,
                            node, value.name, existing.source)

            elif scope is self.scope:
                if (isinstance(parent_stmt, ast.comprehension) and
                        not isinstance(self.getParent(existing.source),
                                       (ast.For, ast.comprehension))):
                    self.report(messages.RedefinedInListComp,
                                node, value.name, existing.source)
                elif not existing.used and value.redefines(existing):
                    self.report(messages.RedefinedWhileUnused,
                                node, value.name, existing.source)

            elif isinstance(existing, Importation) and value.redefines(existing):
                existing.redefined.append(node)

        if value.name in self.scope:
            # then assume the rebound name is used as a global or within a loop
            value.used = self.scope[value.name].used

        self.scope[value.name] = value

existing = self.scope.get(value.name)
        if not redefinedWhileUnused and self.hasParent(value.source, ast.ListComp):
            if (existing and reportRedef
                    and not self.hasParent(existing.source, (ast.For, ast.ListComp))):
                self.report(messages.RedefinedInListComp,
                            node.lineno, value.name, existing.source.lineno)

        if isinstance(value, UnBinding):
            try:
                del self.scope[value.name]
            except KeyError:
                self.report(messages.UndefinedName, node.lineno, value.name)
        elif (isinstance(existing, Definition)
              and not existing.used
              and not self.differentForks(node, existing.source)):
            self.report(messages.RedefinedWhileUnused,
                        node.lineno, value.name, existing.source.lineno)
        else:
            self.scope[value.name] = value

redefinedWhileUnused = True
                    self.report(messages.RedefinedWhileUnused,
                                node, value.name, existing.source)

        existing = self.scope.get(value.name)
        if not redefinedWhileUnused and self.hasParent(value.source, ast.ListComp):
            if (existing and reportRedef
                    and not self.hasParent(existing.source, (ast.For, ast.ListComp))
                    and not self.differentForks(node, existing.source)):
                self.report(messages.RedefinedInListComp,
                            node, value.name, existing.source)

        if (isinstance(existing, Definition)
                and not existing.used
                and not self.differentForks(node, existing.source)):
            self.report(messages.RedefinedWhileUnused,
                        node, value.name, existing.source)
        else:
            self.scope[value.name] = value

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)

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 existing and not self.differentForks(node, existing.source):

            parent_stmt = self.getParent(value.source)
            if isinstance(existing, Importation) and isinstance(parent_stmt, ast.For):
                self.report(messages.ImportShadowedByLoopVar,
                            node, value.name, existing.source)

            elif scope is self.scope:
                if (isinstance(parent_stmt, ast.comprehension) and
                        not isinstance(self.getParent(existing.source),
                                       (ast.For, ast.comprehension))):
                    self.report(messages.RedefinedInListComp,
                                node, value.name, existing.source)
                elif not existing.used and value.redefines(existing):
                    self.report(messages.RedefinedWhileUnused,
                                node, value.name, existing.source)

            elif isinstance(existing, Importation) and value.redefines(existing):
                existing.redefined.append(node)

        self.scope[value.name] = value

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)

def my_report(self, messageClass, *args, **kwargs):
    if pym.UndefinedName == messageClass:
        message = messageClass(self.filename, *args, **kwargs)
        self.undefined_names.append(message.to_list())
    elif pym.UnusedImport == messageClass:
        if self.filename not in IGNORE_FILES:
            message = messageClass(self.filename, *args, **kwargs)
            self.unused_imports.append(message.to_list())
    elif pym.UnusedVariable == messageClass:
        message = messageClass(self.filename, *args, **kwargs)
        self.unused_var.append(message.to_list())
    elif pym.RedefinedInListComp == messageClass:
        message = messageClass(self.filename, *args, **kwargs)
        self.shadowed_var.append(message.to_list())
    elif pym.RedefinedWhileUnused == messageClass:
        message = messageClass(self.filename, *args, **kwargs)
        self.dublicated_funcs.append(message.to_list())
    else:
        if self.filename not in IGNORE_FILES:
            print(messageClass(self.filename, *args, **kwargs))
            ERRORS[str(messageClass)] = messageClass(self.filename, *args, **kwargs).to_list()

if existing and not self.differentForks(node, existing.source):

            parent_stmt = self.getParent(value.source)
            if isinstance(existing, Importation) and isinstance(parent_stmt, ast.For):
                self.report(messages.ImportShadowedByLoopVar,
                            node, value.name, existing.source)

            elif scope is self.scope:
                if (isinstance(parent_stmt, ast.comprehension) and
                        not isinstance(self.getParent(existing.source),
                                       (ast.For, ast.comprehension))):
                    self.report(messages.RedefinedInListComp,
                                node, value.name, existing.source)
                elif not existing.used and value.redefines(existing):
                    self.report(messages.RedefinedWhileUnused,
                                node, value.name, existing.source)

            elif isinstance(existing, Importation) and value.redefines(existing):
                existing.redefined.append(node)

        if value.name in self.scope:
            # then assume the rebound name is used as a global or within a loop
            value.used = self.scope[value.name].used

        self.scope[value.name] = value