remove %s formatting from docs

doc/en/example/assertion/failure_demo.py

@@ -177,7 +177,7 @@ class TestRaises:
 
     def test_reinterpret_fails_with_print_for_the_fun_of_it(self):
         items = [1, 2, 3]
-        print("items is %r" % items)
+        print("items is {!r}".format(items))
         a, b = items.pop()
 
     def test_some_error(self):

doc/en/example/markers.rst

@@ -384,7 +384,7 @@ specifies via named environments:
         envnames = [mark.args[0] for mark in item.iter_markers(name="env")]
         if envnames:
             if item.config.getoption("-E") not in envnames:
-                pytest.skip("test requires env in %r" % envnames)
+                pytest.skip("test requires env in {!r}".format(envnames))
 
 A test file using this local plugin:
 
@@ -578,7 +578,7 @@ for your particular platform, you could use the following plugin:
         supported_platforms = ALL.intersection(mark.name for mark in item.iter_markers())
         plat = sys.platform
         if supported_platforms and plat not in supported_platforms:
-            pytest.skip("cannot run on platform %s" % (plat))
+            pytest.skip("cannot run on platform {}".format(plat))
 
 then tests will be skipped if they were specified for a different platform.
 Let's do a little test file to show how this looks like:

doc/en/example/multipython.py

@@ -69,4 +69,4 @@ class Python:
 @pytest.mark.parametrize("obj", [42, {}, {1: 3}])
 def test_basic_objects(python1, python2, obj):
     python1.dumps(obj)
-    python2.load_and_is_true("obj == %s" % obj)
+    python2.load_and_is_true("obj == {}".format(obj))

doc/en/example/nonpython/conftest.py

@@ -33,13 +33,13 @@ class YamlItem(pytest.Item):
             return "\n".join(
                 [
                     "usecase execution failed",
-                    "   spec failed: %r: %r" % excinfo.value.args[1:3],
+                    "   spec failed: {1!r}: {2!r}".format(*excinfo.value.args),
                     "   no further details known at this point.",
                 ]
             )
 
     def reportinfo(self):
-        return self.fspath, 0, "usecase: %s" % self.name
+        return self.fspath, 0, "usecase: {}".format(self.name)
 
 
 class YamlException(Exception):

doc/en/example/reportingdemo.rst

@@ -434,7 +434,7 @@ Here is a nice run of several failures and how ``pytest`` presents things:
 
         def test_reinterpret_fails_with_print_for_the_fun_of_it(self):
             items = [1, 2, 3]
-            print("items is %r" % items)
+            print("items is {!r}".format(items))
     >       a, b = items.pop()
     E       TypeError: 'int' object is not iterable
 

doc/en/example/simple.rst

@@ -478,7 +478,7 @@ an ``incremental`` marker which is to be used on classes:
         if "incremental" in item.keywords:
             previousfailed = getattr(item.parent, "_previousfailed", None)
             if previousfailed is not None:
-                pytest.xfail("previous test failed (%s)" % previousfailed.name)
+                pytest.xfail("previous test failed ({})".format(previousfailed.name))
 
 These two hook implementations work together to abort incremental-marked
 tests in a class.  Here is a test module example:
@@ -684,7 +684,7 @@ case we just write some information out to a ``failures`` file:
             with open("failures", mode) as f:
                 # let's also access a fixture for the fun of it
                 if "tmpdir" in item.fixturenames:
-                    extra = " (%s)" % item.funcargs["tmpdir"]
+                    extra = " ({})".format(item.funcargs["tmpdir"])
                 else:
                     extra = ""