audit .format(...) calls

docs/source/internal/writing-code.rst

@@ -175,11 +175,7 @@ across multiple lines, insert a new-line after the opening parenthesis, e.g.,
             statistic = next(stats_for_error_code)
             count = statistic.count
             count += sum(stat.count for stat in stats_for_error_code)
-            self._write('{count:<5} {error_code} {message}'.format(
-                count=count,
-                error_code=error_code,
-                message=statistic.message,
-            ))
+            self._write(f'{count:<5} {error_code} {statistic.message}')
 
 In the first example, we put a few of the parameters all on one line, and then
 added the last two on their own. In the second example, each parameter has its

src/flake8/checker.py

@@ -380,8 +380,7 @@ class FileChecker:
             # NOTE(sigmavirus24): Historically, pep8 has always reported this
             # as an E902. We probably *want* a better error code for this
             # going forward.
-            message = "{}: {}".format(type(e).__name__, e)
-            self.report("E902", 0, 0, message)
+            self.report("E902", 0, 0, f"{type(e).__name__}: {e}")
             return None
 
     def report(
@@ -473,10 +472,7 @@ class FileChecker:
         except (ValueError, SyntaxError, TypeError) as e:
             row, column = self._extract_syntax_information(e)
             self.report(
-                "E999",
-                row,
-                column,
-                "{}: {}".format(type(e).__name__, e.args[0]),
+                "E999", row, column, f"{type(e).__name__}: {e.args[0]}"
             )
             return
 

src/flake8/exceptions.py

@@ -39,8 +39,8 @@ class InvalidSyntax(Flake8Exception):
     def __init__(self, exception: Exception) -> None:
         """Initialize our InvalidSyntax exception."""
         self.original_exception = exception
-        self.error_message = "{}: {}".format(
-            exception.__class__.__name__, exception.args[0]
+        self.error_message = (
+            f"{type(exception).__name__}: {exception.args[0]}"
         )
         self.error_code = "E902"
         self.line_number = 1

src/flake8/formatting/base.py

@@ -121,13 +121,7 @@ class BaseFormatter:
             statistic = next(stats_for_error_code)
             count = statistic.count
             count += sum(stat.count for stat in stats_for_error_code)
-            self._write(
-                "{count:<5} {error_code} {message}".format(
-                    count=count,
-                    error_code=error_code,
-                    message=statistic.message,
-                )
-            )
+            self._write(f"{count:<5} {error_code} {statistic.message}")
 
     def show_benchmarks(self, benchmarks: List[Tuple[str, float]]) -> None:
         """Format and print the benchmarks."""

src/flake8/options/manager.py

@@ -295,7 +295,7 @@ class Option:
             parts.append(arg)
         for k, v in self.filtered_option_kwargs.items():
             parts.append(f"{k}={v!r}")
-        return "Option({})".format(", ".join(parts))
+        return f"Option({', '.join(parts)})"
 
     def normalize(self, value: Any, *normalize_args: str) -> Any:
         """Normalize the value based on the option configuration."""

src/flake8/utils.py

@@ -126,11 +126,9 @@ def parse_files_to_codes_mapping(  # noqa: C901
             return "    " + s.strip().replace("\n", "\n    ")
 
         return exceptions.ExecutionError(
-            "Expected `per-file-ignores` to be a mapping from file exclude "
-            "patterns to ignore codes.\n\n"
-            "Configured `per-file-ignores` setting:\n\n{}".format(
-                _indent(value)
-            )
+            f"Expected `per-file-ignores` to be a mapping from file exclude "
+            f"patterns to ignore codes.\n\n"
+            f"Configured `per-file-ignores` setting:\n\n{_indent(value)}"
         )
 
     for token in _tokenize_files_to_codes_mapping(value):