setup pip cache

.github/workflows/test.yml

@@ -50,6 +50,7 b' jobs:'
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+        cache: pip
     - name: Install latex
       if: runner.os == 'Linux' && matrix.deps == 'test_extra'
       run: sudo apt-get -yq -o Acquire::Retries=3 --no-install-suggests --no-install-recommends install texlive dvipng

IPython/utils/timing.py

@@ -62,7 +62,6 b' if resource is not None and hasattr(resource, "getrusage"):'
         Similar to clock(), but return a tuple of user/system times."""
         return resource.getrusage(resource.RUSAGE_SELF)[:2]
 
-
 else:
     # There is no distinction of user/system time under windows, so we just use
     # time.perff_counter() for everything...

setup.cfg

@@ -103,3 +103,6 b' pygments.lexers ='
 ignore_patterns = 
    IPython/core/tests,
    IPython/testing
+
+[tool.black]
+exclude = 'timing\.py'