Prefer f-strings instead of str.format

Author: WhyNotHugo

piptools/resolver.py

@@ -266,8 +266,8 @@ def resolve(self, max_rounds: int = 10) -> set[InstallRequirement]:
                     raise RuntimeError(
                         "No stable configuration of concrete packages "
                         "could be found for the given constraints after "
-                        "{max_rounds} rounds of resolving.\n"
-                        "This is likely a bug.".format(max_rounds=max_rounds)
+                        f"{max_rounds} rounds of resolving.\n"
+                        "This is likely a bug."
                     )
 
                 log.debug("")
@@ -429,9 +429,9 @@ def get_best_match(self, ireq: InstallRequirement) -> InstallRequirement:
 
         # Format the best match
         log.debug(
-            "found candidate {} (constraint was {})".format(
-                format_requirement(best_match), format_specifier(ireq)
-            )
+            "found candidate %s (constraint was %s)",
+            format_requirement(best_match),
+            format_specifier(ireq),
         )
         best_match.comes_from = ireq.comes_from
         if hasattr(ireq, "_source_ireqs"):

tests/test_cli_compile.py

@@ -1058,14 +1058,14 @@ def test_generate_hashes_with_editable(pip_conf, runner):
         fp.write(f"-e {small_fake_package_url}\n")
     out = runner.invoke(cli, ["--no-annotate", "--generate-hashes"])
     expected = (
-        "-e {}\n"
+        f"-e {small_fake_package_url}\n"
         "small-fake-a==0.1 \\\n"
         "    --hash=sha256:5e6071ee6e4c59e0d0408d366f"
         "e9b66781d2cf01be9a6e19a2433bb3c5336330\n"
         "small-fake-b==0.1 \\\n"
         "    --hash=sha256:acdba8f8b8a816213c30d5310c"
         "3fe296c0107b16ed452062f7f994a5672e3b3f\n"
-    ).format(small_fake_package_url)
+    )
     assert out.exit_code == 0
     assert expected in out.stderr
 

tests/test_cli_sync.py

@@ -205,9 +205,9 @@ def test_pip_install_flags(run, cli_flags, expected_install_flags, runner):
 
     call_args = [call[0][0] for call in run.call_args_list]
     called_install_options = [args[6:] for args in call_args if args[3] == "install"]
-    assert called_install_options == [expected_install_flags], "Called args: {}".format(
-        call_args
-    )
+    assert called_install_options == [
+        expected_install_flags
+    ], f"Called args: {call_args}"
 
 
 @pytest.mark.parametrize(