Currently modifying the cache for parso doctests is not needed. So just remove it.

conftest.py

@@ -9,42 +9,17 @@ from parso import cache
 collect_ignore = ["setup.py"]
 
 
-# The following hooks (pytest_configure, pytest_unconfigure) are used
-# to modify `cache._default_cache_path` because `clean_parso_cache`
-# has no effect during doctests.  Without these hooks, doctests uses
-# user's cache (e.g., ~/.cache/parso/).  We should remove this
-# workaround once the problem is fixed in py.test.
-#
-# See (this was back when parso was part of jedi):
-# - https://github.com/davidhalter/jedi/pull/168
-# - https://bitbucket.org/hpk42/pytest/issue/275/
-
-parso_cache_directory_orig = None
-parso_cache_directory_temp = None
-
-
 def pytest_addoption(parser):
     parser.addoption("--warning-is-error", action='store_true',
                      help="Warnings are treated as errors.")
 
 
 def pytest_configure(config):
-    global parso_cache_directory_orig, parso_cache_directory_temp
-    parso_cache_directory_orig = cache._default_cache_path
-    parso_cache_directory_temp = tempfile.mkdtemp(prefix='parso-test-')
-    cache._default_cache_path = parso_cache_directory_temp
-
     if config.option.warning_is_error:
         import warnings
         warnings.simplefilter("error")
 
 
-def pytest_unconfigure(config):
-    global parso_cache_directory_orig, parso_cache_directory_temp
-    cache._default_cache_path = parso_cache_directory_orig
-    shutil.rmtree(parso_cache_directory_temp)
-
-
 @pytest.fixture(scope='session')
 def clean_parso_cache(request):
     """
@@ -58,7 +33,7 @@ def clean_parso_cache(request):
     """
     old = cache._default_cache_path
     tmp = tempfile.mkdtemp(prefix='parso-test-')
-    cache.default_cache_path = tmp
+    cache._default_cache_path = tmp
 
     @request.addfinalizer
     def restore():