introduced f-strings

setup.py

@@ -80,8 +80,7 @@ def run(self):
         with open(join(dirname(__file__), 'src', 'pytest-cov.pth'), 'w') as fh:
             with open(join(dirname(__file__), 'src', 'pytest-cov.embed')) as sh:
                 fh.write(
-                    'import os, sys;'
-                    'exec(%r)' % sh.read().replace('    ', ' ')
+                    f"import os, sys;exec({sh.read().replace('    ', ' ')!r})"
                 )
 
 

src/pytest_cov/engine.py

@@ -140,19 +140,19 @@ def summary(self, stream):
 
         # Output coverage section header.
         if len(self.node_descs) == 1:
-            self.sep(stream, '-', 'coverage: %s' % ''.join(self.node_descs))
+            self.sep(stream, '-', f"coverage: {''.join(self.node_descs)}")
         else:
             self.sep(stream, '-', 'coverage')
             for node_desc in sorted(self.node_descs):
-                self.sep(stream, ' ', '%s' % node_desc)
+                self.sep(stream, ' ', f'{node_desc}')
 
         # Report on any failed workers.
         if self.failed_workers:
             self.sep(stream, '-', 'coverage: failed workers')
             stream.write('The following workers failed to return coverage data, '
                          'ensure that pytest-cov is installed on these workers.\n')
             for node in self.failed_workers:
-                stream.write('%s\n' % node.gateway.id)
+                stream.write(f'{node.gateway.id}\n')
 
         # Produce terminal report if wanted.
         if any(x in self.cov_report for x in ['term', 'term-missing']):
@@ -178,7 +178,7 @@ def summary(self, stream):
             with _backup(self.cov, "config"):
                 total = self.cov.report(ignore_errors=True, file=_NullFile)
             if annotate_dir:
-                stream.write('Coverage annotated source written to dir %s\n' % annotate_dir)
+                stream.write(f'Coverage annotated source written to dir {annotate_dir}\n')
             else:
                 stream.write('Coverage annotated source written next to source\n')
 
@@ -187,14 +187,14 @@ def summary(self, stream):
             output = self.cov_report['html']
             with _backup(self.cov, "config"):
                 total = self.cov.html_report(ignore_errors=True, directory=output)
-            stream.write('Coverage HTML written to dir %s\n' % (self.cov.config.html_dir if output is None else output))
+            stream.write(f'Coverage HTML written to dir {self.cov.config.html_dir if output is None else output}\n')
 
         # Produce xml report if wanted.
         if 'xml' in self.cov_report:
             output = self.cov_report['xml']
             with _backup(self.cov, "config"):
                 total = self.cov.xml_report(ignore_errors=True, outfile=output)
-            stream.write('Coverage XML written to file %s\n' % (self.cov.config.xml_output if output is None else output))
+            stream.write(f'Coverage XML written to file {self.cov.config.xml_output if output is None else output}\n')
 
         # Produce lcov report if wanted.
         if 'lcov' in self.cov_report:
@@ -206,7 +206,7 @@ def summary(self, stream):
                 # Coverage.lcov_report doesn't return any total and we need it for --cov-fail-under.
                 total = self.cov.report(ignore_errors=True, file=_NullFile)
 
-            stream.write('Coverage LCOV written to file %s\n' % (self.cov.config.lcov_output if output is None else output))
+            stream.write(f'Coverage LCOV written to file {self.cov.config.lcov_output if output is None else output}\n')
 
         return total
 

src/pytest_cov/plugin.py

@@ -305,9 +305,9 @@ def pytest_runtestloop(self, session):
             try:
                 self.cov_total = self.cov_controller.summary(self.cov_report)
             except CoverageException as exc:
-                message = 'Failed to generate report: %s\n' % exc
+                message = f'Failed to generate report: {exc}\n'
                 session.config.pluginmanager.getplugin("terminalreporter").write(
-                    'WARNING: %s\n' % message, red=True, bold=True)
+                    f'WARNING: {message}\n', red=True, bold=True)
                 warnings.warn(CovReportWarning(message))
                 self.cov_total = 0
             assert self.cov_total is not None, 'Test coverage should never be `None`'
@@ -319,7 +319,7 @@ def pytest_terminal_summary(self, terminalreporter):
         if self._disabled:
             if self.options.no_cov_should_warn:
                 message = 'Coverage disabled via --no-cov switch!'
-                terminalreporter.write('WARNING: %s\n' % message, red=True, bold=True)
+                terminalreporter.write(f'WARNING: {message}\n', red=True, bold=True)
                 warnings.warn(CovDisabledWarning(message))
             return
         if self.cov_controller is None: