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-rw-r--r--coverage/python.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/coverage/python.py b/coverage/python.py
index f75be60a..9418c386 100644
--- a/coverage/python.py
+++ b/coverage/python.py
@@ -26,7 +26,13 @@ def read_python_source(filename):
"""
with open(filename, "rb") as f:
- return f.read().replace(b"\r\n", b"\n").replace(b"\r", b"\n")
+ source = f.read()
+
+ if env.IRONPYTHON:
+ # IronPython reads Unicode strings even for "rb" files.
+ source = bytes(source)
+
+ return source.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
@contract(returns='unicode')