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-rw-r--r--Lib/unittest/mock.py8
1 files changed, 6 insertions, 2 deletions
diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 9a0bbf0..6ecc4c7 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -2138,11 +2138,15 @@ FunctionAttributes = set([
'func_name',
])
-import _io
-file_spec = list(set(dir(_io.TextIOWrapper)).union(set(dir(_io.BytesIO))))
+file_spec = None
def mock_open(mock=None, read_data=None):
+ global file_spec
+ if file_spec is None:
+ import _io
+ file_spec = list(set(dir(_io.TextIOWrapper)).union(set(dir(_io.BytesIO))))
+
if mock is None:
mock = MagicMock(spec=file_spec)