How to open daemon thread

# Open daemon thread at a plurality of threads 
from Threading Import the Thread 
Import Time 
DEF sayHi (): 
 Print ( 123) 
the time.sleep ( . 1) 
 Print ( 'end123') 
DEF bar (): 
 Print ( 456) 
the time.sleep ( . 3) 
 Print ( 'end456') 
IF the __name__ == '__main__': 
T1 = the thread ( target = sayHi) 
T2 = the thread ( target = bar) 
t1.setDaemon ( True) # I daemon thread, the thread must be set before starting 
= t1.daemon True # I set up a daemon thread, the thread must be set before the start 
t1.start () 
t2.start () 
 Print ( 'old-generation eat S%'% 'bird feces is the main thread') 
# single thread the open-daemon thread
Threading from Import the Thread 
Import Time 
DEF Task (name): 
the time.sleep ( 2) 
 Print ( '% S shit' name%) 
IF the __name__ == '__main__': 
T = the Thread ( target = Task , args = ( 'old Generation ' ,)) 
t.setDaemon ( True) # I daemon thread, the thread must be set before the start 
t.start () 
 Print ( ' main ha ha ha ha ')