Change default to None and set it to LOCK_EX in __init__ (fixes #509)

sebastinas · sebastinas · commit e83fb4a04960 · 2015-03-15T18:41:02.000+01:00
Signed-off-by: Sebastian Ramacher &lt;sebastian+dev@ramacher.at&gt;
diff --git a/bpython/filelock.py b/bpython/filelock.py
@@ -36,7 +36,10 @@ class FileLock(object):
     On platforms without fcntl, all operations in this class are no-ops.
     """
 
-    def __init__(self, fd, mode=fcntl.LOCK_EX):
+    def __init__(self, fd, mode=None):
+        if has_fcntl and mode is None:
+            mode = fcntl.LOCK_EX
+
         self.fd = fd
         self.mode = mode
 
