tools/koji-compose.py: test with pylint and fix found issues

Check `tools/koji-compose.py` using pylint as part of GitHub actions.
Fix all issues that were found by pylint.

.github/workflows/tests.yml

@@ -88,7 +88,7 @@ jobs:
     steps:
 
       - name: Install build and test dependencies
-        run: dnf -y install python3-pylint git-core
+        run: dnf -y install python3-pylint git-core python3-requests
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v3
@@ -97,7 +97,7 @@ jobs:
 
       - name: Analysing the code with pylint
         run: |
-          python3 -m pylint dnf-json
+          python3 -m pylint dnf-json tools/koji-compose.py
 
   lint:
     name: "⌨ Lint"

tools/koji-compose.py

@@ -1,4 +1,6 @@
 #!/usr/bin/python3
+# pylint: disable=invalid-name
+
 import argparse
 import json
 import sys
@@ -200,15 +202,18 @@ def main():
             sys.exit(1)
         status = r.json()["status"]
         print(status, file=sys.stderr)
+
         if status == "success":
             print("Compose worked!", file=sys.stderr)
             print(r.text, file=sys.stderr)
             break
-        elif status == "failure":
+
+        if status == "failure":
             print("compose failed!", file=sys.stderr)
             print(r.text, file=sys.stderr)
             sys.exit(1)
-        elif status != "pending" and status != "running":
+
+        if status not in ("pending", "running"):
             print(f"unexpected status: {status}", file=sys.stderr)
             print(r.text, file=sys.stderr)
             sys.exit(1)
@@ -218,7 +223,7 @@ def main():
     r = composer_api_client.compose_log(compose_id)
     logs = r.json()
     assert "image_builds" in logs
-    assert type(logs["image_builds"]) == list
+    assert isinstance(logs["image_builds"], list)
     assert len(logs["image_builds"]) == len(cr["image_requests"])