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I ran pyflakes on Python 3.5. Attached patch fixes some undefined names warnings.
I don't know what to with these two warnings, they look to be false positive:
diff -r 72889bf8531d Lib/multiprocessing/spawn.py
--- a/Lib/multiprocessing/spawn.py Tue Mar 18 13:21:29 2014 +0100
+++ b/Lib/multiprocessing/spawn.py Wed Mar 19 11:49:24 2014 +0100
@@ -64,6 +64,7 @@ def freeze_support():
 Run code for process object if this in not the main process
 '''
 if is_forking(sys.argv):
+ # FIXME: main() is undefined
 main()
 sys.exit()
 
diff -r 72889bf8531d Lib/multiprocessing/synchronize.py
--- a/Lib/multiprocessing/synchronize.py Tue Mar 18 13:21:29 2014 +0100
+++ b/Lib/multiprocessing/synchronize.py Wed Mar 19 11:50:50 2014 +0100
@@ -51,7 +51,6 @@ class SemLock(object):
 _rand = tempfile._RandomNameSequence()
 
 def __init__(self, kind, value, maxvalue, *, ctx):
- ctx = ctx or get_context()
 ctx = ctx.get_context()
 unlink_now = sys.platform == 'win32' or ctx._name == 'fork'
 for i in range(100):