Update docs and code after dropping EOL 3.7

Author: hugovk

doc/en/index.rst

@@ -18,7 +18,7 @@ The ``pytest`` framework makes it easy to write small, readable tests, and can
 scale to support complex functional testing for applications and libraries.
 
 
-``pytest`` requires: Python 3.7+ or PyPy3.
+``pytest`` requires: Python 3.8+ or PyPy3.
 
 **PyPI package name**: :pypi:`pytest`
 

pyproject.toml

@@ -113,7 +113,7 @@ template = "changelog/_template.rst"
   showcontent = true
 
 [tool.black]
-target-version = ['py37']
+target-version = ['py38']
 
 # check-wheel-contents is executed by the build-and-inspect-python-package action.
 [tool.check-wheel-contents]

testing/_py/test_local.py

@@ -1519,17 +1519,17 @@ def test_chown_identity_rec_mayfail(self, path1):
         path1.chown(owner, group)
 
 
-class TestUnicodePy2Py3:
+class TestUnicode:
     def test_join_ensure(self, tmpdir, monkeypatch):
-        if sys.version_info >= (3, 0) and "LANG" not in os.environ:
+        if "LANG" not in os.environ:
             pytest.skip("cannot run test without locale")
         x = local(tmpdir.strpath)
         part = "hällo"
         y = x.ensure(part)
         assert x.join(part) == y
 
     def test_listdir(self, tmpdir):
-        if sys.version_info >= (3, 0) and "LANG" not in os.environ:
+        if "LANG" not in os.environ:
             pytest.skip("cannot run test without locale")
         x = local(tmpdir.strpath)
         part = "hällo"