style: convert more string formatting to f-strings

6 files changed, 7 insertions, 7 deletions

diff --git a/coverage/disposition.py b/coverage/disposition.py
index 1c39a9c1..30b31af6 100644
--- a/coverage/disposition.py
+++ b/coverage/disposition.py
@@ -33,7 +33,7 @@ def disposition_debug_msg(disp):
         if disp.original_filename != disp.source_filename:
             msg += f" as {disp.source_filename!r}"
         if disp.file_tracer:
-            msg += ": will be traced by %r" % disp.file_tracer
+            msg += f": will be traced by {disp.file_tracer!r}"
     else:
         msg = f"Not tracing {disp.original_filename!r}: {disp.reason}"
     return msg
diff --git a/coverage/execfile.py b/coverage/execfile.py
index 3da3ba1f..38dc1d07 100644
--- a/coverage/execfile.py
+++ b/coverage/execfile.py
@@ -144,7 +144,7 @@ class PyRunner:
                     self.arg0 = try_filename
                     break
             else:
-                raise NoSource("Can't find '__main__' module in '%s'" % self.arg0)
+                raise NoSource(f"Can't find '__main__' module in '{self.arg0}'")
 
             # Make a spec. I don't know if this is the right way to do it.
             try_filename = python_reported_file(try_filename)
diff --git a/coverage/misc.py b/coverage/misc.py
index 584efeaa..fa09f890 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -184,7 +184,7 @@ def bool_or_none(b):
 
 def join_regex(regexes):
     """Combine a list of regexes into one that matches any of them."""
-    return "|".join("(?:%s)" % r for r in regexes)
+    return "|".join(f"(?:{r})" for r in regexes)
 
 
 def file_be_gone(path):
diff --git a/coverage/results.py b/coverage/results.py
index 11c4b09b..64e5130c 100644
--- a/coverage/results.py
+++ b/coverage/results.py
@@ -317,7 +317,7 @@ def format_lines(statements, lines, arcs=None):
             for ex in sorted(exits):
                 if line not in lines and ex not in lines:
                     dest = (ex if ex > 0 else "exit")
-                    line_items.append((line, "%d->%s" % (line, dest)))
+                    line_items.append((line, f"{line}->{dest}"))
 
     ret = ', '.join(t[-1] for t in sorted(line_items))
     return ret
diff --git a/coverage/version.py b/coverage/version.py
index 41244144..394cd076 100644
--- a/coverage/version.py
+++ b/coverage/version.py
@@ -16,7 +16,7 @@ def _make_version(major, minor, micro, releaselevel, serial):
         version += ".%d" % (micro,)
     if releaselevel != 'final':
         short = {'alpha': 'a', 'beta': 'b', 'candidate': 'rc'}[releaselevel]
-        version += "%s%d" % (short, serial)
+        version += f"{short}{serial}"
     return version
 
 
diff --git a/coverage/xmlreport.py b/coverage/xmlreport.py
index 8c8409dc..ebc85de4 100644
--- a/coverage/xmlreport.py
+++ b/coverage/xmlreport.py
@@ -67,9 +67,9 @@ class XmlReporter:
         xcoverage.setAttribute("version", __version__)
         xcoverage.setAttribute("timestamp", str(int(time.time()*1000)))
         xcoverage.appendChild(self.xml_out.createComment(
-            " Generated by coverage.py: %s " % __url__
+            f" Generated by coverage.py: {__url__} "
             ))
-        xcoverage.appendChild(self.xml_out.createComment(" Based on %s " % DTD_URL))
+        xcoverage.appendChild(self.xml_out.createComment(f" Based on {DTD_URL} "))
 
         # Call xml_file for each file in the data.
         for fr, analysis in get_analysis_to_report(self.coverage, morfs):