TEMPORARY: find if this PR causes the CI error

Author: DimitriPapadopoulos

zarr/convenience.py

@@ -1,4 +1,5 @@
 """Convenience functions for storing and loading data."""
+import io
 import itertools
 import os
 import re
@@ -484,7 +485,7 @@ def __init__(self, log):
         elif callable(log):
             self.log_func = log
         elif isinstance(log, str):
-            self.log_file = open(log, mode='w')
+            self.log_file = io.open(log, mode='w')
             self.needs_closing = True
         elif hasattr(log, 'write'):
             self.log_file = log