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-rw-r--r--coverage/python.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/coverage/python.py b/coverage/python.py
index 33e6ec01..71b50f0c 100644
--- a/coverage/python.py
+++ b/coverage/python.py
@@ -7,11 +7,13 @@ import os.path
import zipimport
from coverage import env, files
-from coverage.misc import contract, expensive, NoSource, join_regex
+from coverage.misc import contract, expensive, NoSource, join_regex, isolate_module
from coverage.parser import PythonParser
from coverage.phystokens import source_token_lines, source_encoding
from coverage.plugin import FileReporter
+os = isolate_module(os)
+
@contract(returns='bytes')
def read_python_source(filename):