fix: correct previous refactorings

File names should not be rendered with !r, since on Windows that will
produce double backslashes, which only confuses people.

coverage/data.py

@@ -91,7 +91,7 @@ def combine_parallel_data(data, aliases=None, data_paths=None, strict=False, kee
             pattern = os.path.join(os.path.abspath(p), localdot)
             files_to_combine.extend(glob.glob(pattern))
         else:
-            raise CoverageException(f"Couldn't combine from non-existent path {p!r}")
+            raise CoverageException(f"Couldn't combine from non-existent path '{p}'")
 
     if strict and not files_to_combine:
         raise CoverageException("No data to combine")

coverage/execfile.py

@@ -192,8 +192,8 @@ def run(self):
         except CoverageException:
             raise
         except Exception as exc:
-            msg = "Couldn't run '{filename}' as Python code: {exc.__class__.__name__}: {exc}"
-            raise CoverageException(msg.format(filename=self.arg0, exc=exc)) from exc
+            msg = f"Couldn't run '{self.arg0}' as Python code: {exc.__class__.__name__}: {exc}"
+            raise CoverageException(msg) from exc
 
         # Execute the code object.
         # Return to the original directory in case the test code exits in
@@ -278,7 +278,7 @@ def make_code_from_py(filename):
     try:
         source = get_python_source(filename)
     except (OSError, NoSource) as exc:
-        raise NoSource(f"No file to run: {filename!r}") from exc
+        raise NoSource(f"No file to run: '{filename}'") from exc
 
     code = compile_unicode(source, filename, "exec")
     return code
@@ -289,7 +289,7 @@ def make_code_from_pyc(filename):
     try:
         fpyc = open(filename, "rb")
     except OSError as exc:
-        raise NoCode(f"No file to run: {filename!r}") from exc
+        raise NoCode(f"No file to run: '{filename}'") from exc
 
     with fpyc:
         # First four bytes are a version-specific magic number.  It has to

coverage/inorout.py

@@ -369,7 +369,7 @@ def nope(disp, reason):
         if not disp.has_dynamic_filename:
             if not disp.source_filename:
                 raise CoverageException(
-                    f"Plugin {plugin!r} didn't set source_filename for {disp.original_filename!r}"
+                    f"Plugin {plugin!r} didn't set source_filename for '{disp.original_filename}'"
                 )
             reason = self.check_include_omit_etc(disp.source_filename, frame)
             if reason:

coverage/parser.py

@@ -41,7 +41,7 @@ def __init__(self, text=None, filename=None, exclude=None):
             try:
                 self.text = get_python_source(self.filename)
             except OSError as err:
-                raise NoSource(f"No source for code: {self.filename!r}: {err}") from err
+                raise NoSource(f"No source for code: '{self.filename}': {err}") from err
 
         self.exclude = exclude
 
@@ -238,7 +238,7 @@ def parse_source(self):
             else:
                 lineno = err.args[1][0]     # TokenError
             raise NotPython(
-                f"Couldn't parse {self.filename!r} as Python source: " +
+                f"Couldn't parse '{self.filename}' as Python source: " +
                 f"{err.args[0]!r} at line {lineno}"
             ) from err
 

coverage/sqldata.py

@@ -541,7 +541,7 @@ def add_file_tracers(self, file_tracers):
                 file_id = self._file_id(filename)
                 if file_id is None:
                     raise CoverageException(
-                        f"Can't add file tracer data for unmeasured file {filename!r}"
+                        f"Can't add file tracer data for unmeasured file '{filename}'"
                     )
 
                 existing_plugin = self.file_tracer(filename)