How to use the py3status.helpers.print_stderr function in py3status

warned = False
    if create_readme(readme) != create_readme(modules_readme):
        for module in sorted(readme):
            if mods and module not in mods:
                continue
            err = None
            if module not in modules_readme:
                err = "Module {} in README but not in /modules".format(module)
            elif (
                "".join(readme[module]).strip()
                != "".join(modules_readme[module]).strip()
            ):
                err = "Module {} docstring does not match README".format(module)
            if err:
                if not warned:
                    print_stderr("Documentation does not match!\n")
                    warned = True
                print_stderr(err)

        for module in modules_readme:
            if mods and module not in mods:
                continue
            if module not in readme:
                print_stderr("Module {} in /modules but not in README".format(module))
        if show_diff:
            print_stderr(
                "\n".join(
                    difflib.unified_diff(
                        create_readme(readme).split("\n"),
                        create_readme(modules_readme).split("\n"),
                    )
                )

elif (
                "".join(readme[module]).strip()
                != "".join(modules_readme[module]).strip()
            ):
                err = "Module {} docstring does not match README".format(module)
            if err:
                if not warned:
                    print_stderr("Documentation does not match!\n")
                    warned = True
                print_stderr(err)

        for module in modules_readme:
            if mods and module not in mods:
                continue
            if module not in readme:
                print_stderr("Module {} in /modules but not in README".format(module))
        if show_diff:
            print_stderr(
                "\n".join(
                    difflib.unified_diff(
                        create_readme(readme).split("\n"),
                        create_readme(modules_readme).split("\n"),
                    )
                )
            )
        else:
            if warned:
                print_stderr("\nUse `py3-cmd docstring --diff` to view diff.")

if mods and module not in mods:
                continue
            if module not in readme:
                print_stderr("Module {} in /modules but not in README".format(module))
        if show_diff:
            print_stderr(
                "\n".join(
                    difflib.unified_diff(
                        create_readme(readme).split("\n"),
                        create_readme(modules_readme).split("\n"),
                    )
                )
            )
        else:
            if warned:
                print_stderr("\nUse `py3-cmd docstring --diff` to view diff.")

!= "".join(modules_readme[module]).strip()
            ):
                err = "Module {} docstring does not match README".format(module)
            if err:
                if not warned:
                    print_stderr("Documentation does not match!\n")
                    warned = True
                print_stderr(err)

        for module in modules_readme:
            if mods and module not in mods:
                continue
            if module not in readme:
                print_stderr("Module {} in /modules but not in README".format(module))
        if show_diff:
            print_stderr(
                "\n".join(
                    difflib.unified_diff(
                        create_readme(readme).split("\n"),
                        create_readme(modules_readme).split("\n"),
                    )
                )
            )
        else:
            if warned:
                print_stderr("\nUse `py3-cmd docstring --diff` to view diff.")

for module in sorted(readme):
            if mods and module not in mods:
                continue
            err = None
            if module not in modules_readme:
                err = "Module {} in README but not in /modules".format(module)
            elif (
                "".join(readme[module]).strip()
                != "".join(modules_readme[module]).strip()
            ):
                err = "Module {} docstring does not match README".format(module)
            if err:
                if not warned:
                    print_stderr("Documentation does not match!\n")
                    warned = True
                print_stderr(err)

        for module in modules_readme:
            if mods and module not in mods:
                continue
            if module not in readme:
                print_stderr("Module {} in /modules but not in README".format(module))
        if show_diff:
            print_stderr(
                "\n".join(
                    difflib.unified_diff(
                        create_readme(readme).split("\n"),
                        create_readme(modules_readme).split("\n"),
                    )
                )
            )
        else:

msg, exc_type.__name__, filename, line_no
            )
        except:  # noqa e722
            # something went wrong report what we can.
            msg = "{}.".format(msg)
        finally:
            # delete tb!
            del tb
        # log the exception and notify user
        self.py3_wrapper.log(msg, "warning")
        if traceback:
            # if debug is not in the config  then we are at an early stage of
            # running py3status and logging is not yet available so output the
            # error to STDERR so it can be seen
            if "debug" not in self.config:
                print_stderr("\n".join(traceback))
            elif self.config.get("log_file"):
                self.py3_wrapper.log("".join(["Traceback\n"] + traceback))
        if notify_user:
            self.py3_wrapper.notify_user(msg, level=level)

def update_readme_for_modules(modules):
    """
    Update README.md updating the sections for the module names listed.
    """
    readme = parse_readme()
    module_docstrings = core_module_docstrings()
    if modules == ["__all__"]:
        modules = core_module_docstrings().keys()
    for module in modules:
        if module in module_docstrings:
            print_stderr("Updating README.md for module {}".format(module))
            readme[module] = module_docstrings[module]
        else:
            print_stderr("Module {} not in core modules".format(module))

    # write the file
    readme_file = os.path.join(modules_directory(), "README.md")
    with open(readme_file, "w") as f:
        f.write(create_readme(readme))

if not replaced:
                    out = out + [
                        "".join(_to_docstring(modules_dict[mod])).strip() + "\n"
                    ]
                    replaced = True
                if lines:
                    done = True
                if not done and not lines:
                    lines = True
                continue
            if not lines or done:
                out.append(row)
        mod_file = os.path.join(modules_directory(), mod + ".py")
        with open(mod_file, "w") as f:
            f.writelines(out)
    print_stderr("Modules updated from README.md")