first commit

.venv/Lib/site-packages/nbconvert/tests/utils.py

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+from shutil import which
+
+import pytest
+
+
+def onlyif_cmds_exist(*commands):
+    """
+    Decorator to skip test when at least one of `commands` is not found.
+    """
+    for cmd in commands:
+        if not which(cmd):
+            return pytest.mark.skip(f"This test runs only if command '{cmd}' is installed")
+    return lambda f: f