prevent accidental file creation

linnarsson-lab · Sep 29, 2018 · cdded22 · cdded22
1 parent e346803
commit cdded22
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/loompy/loompy.py b/loompy/loompy.py
@@ -70,7 +70,8 @@ def __init__(self, filename: str, mode: str = 'r+', *, validate: bool = True, sp
 		Returns:
 			Nothing.
 		"""
-
+		if not os.path.exists(filename):
+			raise IOError(f"File '{filename}' not found")
 		# make sure a valid mode was passed
 		if mode != 'r+' and mode != 'r':
 			raise ValueError("Mode must be either 'r' or 'r+'")