flake8 fixes: unused imports and f-strings without vars

.github/integration-test.py

@@ -104,7 +104,7 @@ def run_test(image_name, test_name, bootstrap_pip_spec, test_files, upgrade, ins
     if upgrade:
         run_container_command(
             test_name,
-            f'curl -L https://tljh.jupyter.org/bootstrap.py | python3 -'
+            'curl -L https://tljh.jupyter.org/bootstrap.py | python3 -'
         )
 
     run_container_command(

integration-tests/test_admin_installer.py

@@ -2,7 +2,6 @@ from hubtraf.user import User
 from hubtraf.auth.dummy import login_dummy
 import pytest
 from functools import partial
-import asyncio
 
 
 @pytest.mark.asyncio

integration-tests/test_extensions.py

@@ -1,4 +1,3 @@
-import os
 import subprocess
 
 

integration-tests/test_hub.py

@@ -8,7 +8,6 @@ from functools import partial
 import asyncio
 import pwd
 import grp
-import sys
 import subprocess
 from os import system
 from tljh.normalize import generate_system_username

integration-tests/test_proxy.py

@@ -12,7 +12,6 @@ import pytest
 from tljh.config import (
     reload_component,
     set_config_value,
-    unset_config_value,
     CONFIG_FILE,
     CONFIG_DIR,
     STATE_DIR,

integration-tests/test_simplest_plugin.py

@@ -84,7 +84,7 @@ def test_new_user_create():
     # Call ensure_user to make sure the user plugin gets called
     user.ensure_user(username)
 
-    with open(f"test_new_user_create") as f:
+    with open("test_new_user_create") as f:
         content = f.read()
 
     assert content == username

tests/test_configurer.py

@@ -2,7 +2,6 @@
 Test configurer
 """
 
-from traitlets import Dict
 from traitlets.config import Config
 import os
 import sys

tests/test_traefik.py

@@ -1,6 +1,5 @@
 """Test traefik configuration"""
 import os
-from unittest import mock
 
 import toml
 import pytest

tljh/config.py

@@ -13,7 +13,6 @@ tljh-config show firstlevel.second_level
 """
 
 import argparse
-import asyncio
 from collections.abc import Sequence, Mapping
 from copy import deepcopy
 import os

tljh/installer.py

@@ -16,7 +16,6 @@ import bcrypt
 import pluggy
 import requests
 from requests.packages.urllib3.exceptions import InsecureRequestWarning
-from getpass import getpass
 
 from tljh import (
     apt,
@@ -26,7 +25,6 @@ from tljh import (
     systemd,
     traefik,
     user,
-    utils
 )
 from .config import (
     CONFIG_DIR,

tljh/jupyterhub_config.py

@@ -5,7 +5,6 @@ JupyterHub config for the littlest jupyterhub.
 from glob import glob
 import os
 
-from systemdspawner import SystemdSpawner
 from tljh import configurer
 from tljh.config import INSTALL_PREFIX, USER_ENV_PREFIX, CONFIG_DIR
 from tljh.utils import get_plugin_manager