import threading
import sys

class ExitThread(threading.Thread):
    def __init__(self, sys_exit_arg=None):
        threading.Thread.__init__(self)
        self.sys_exit_arg = sys_exit_arg

    def run(self):
        print "    thread running."
        if self.sys_exit_arg:
            if self.sys_exit_arg == "raise":
                print "    exit thread using `raise SystemExit, 'raised SystemExit'`"
                raise SystemExit, 'raised SystemExit'        
            print ("    exit thread using `sys.exit(arg)` with arg '%s' of %s."
                % (self.sys_exit_arg, type(self.sys_exit_arg)))
            sys.exit(self.sys_exit_arg)
        print "    exit thread using sys.exit() without arg"
        sys.exit()
    
    def start_and_join(self):
        self.start()
        self.join()
        
class foo(object):
    def __init__(self):
        pass

print "* MainThread: Starting test thread 1..."
t = ExitThread(1)
t.start_and_join()
print "* MainThread: Starting test thread 2..."
t = ExitThread("incredibly informative error description")
t.start_and_join()
print "* MainThread: Starting test thread 3..."
f = foo()
t = ExitThread(f)
t.start_and_join()
print "* MainThread: Starting test thread 4..."
t = ExitThread("raise")
t.start_and_join()
print "* MainThread: Starting test thread 5..."
t = ExitThread()
t.start_and_join()
print "* MainThread: Exit using sys.exit() with arg '%s' of %s." % (f, type(f))
sys.exit(f)


# OUTPUT with the patched version of threading.py:
# ================================================
#* MainThread: Starting test thread 1...
#    thread running.
#    exit thread using `sys.exit(arg)` with arg '1' of <type 'int'>.
#* MainThread: Starting test thread 2...
#    thread running.
#    exit thread using `sys.exit(arg)` with arg 'incredibly informative error description' of <type 'str'>.
#* MainThread: Starting test thread 3...
#    thread running.
#    exit thread using `sys.exit(arg)` with arg '<__main__.foo object at 0x000000000229DDD8>' of <class '__main__.foo'>.
#* MainThread: Starting test thread 4...
#    thread running.
#    exit thread using `raise SystemExit, 'raised SystemExit'`
#* MainThread: Starting test thread 5...
#    thread running.
#    exit thread using sys.exit() without arg
#* MainThread: Exit using sys.exit() with arg '<__main__.foo object at 0x000000000229DDD8>' of <class '__main__.foo'>.