Decrease cost of ipynb code path when unneeded (#3748)

[etc/vim.git] / src / black / handle_ipynb_magics.py

diff --git a/src/black/handle_ipynb_magics.py b/src/black/handle_ipynb_magics.py
index 693f1a68bd4701a361aefcc4c81f38481a7e48df..2b6b920921195bbbb7ec18741b14ca8ce621097b 100644 (file)
--- a/src/black/handle_ipynb_magics.py
+++ b/src/black/handle_ipynb_magics.py
@@ -58,13 +58,18 @@ class Replacement:
 @lru_cache()
 def jupyter_dependencies_are_installed(*, verbose: bool, quiet: bool) -> bool:
     try:
-        import IPython  # noqa:F401
+        # isort: off
+        # tokenize_rt is less commonly installed than IPython
+        # and IPython is expensive to import
         import tokenize_rt  # noqa:F401
+        import IPython  # noqa:F401
+
+        # isort: on
     except ModuleNotFoundError:
         if verbose or not quiet:
             msg = (
                 "Skipping .ipynb files as Jupyter dependencies are not installed.\n"
-                "You can fix this by running ``pip install black[jupyter]``"
+                'You can fix this by running ``pip install "black[jupyter]"``'
             )
             out(msg)
         return False