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Home/ Questions/Q 7854045
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Editorial Team
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Editorial Team
Asked: June 2, 20262026-06-02T19:54:41+00:00 2026-06-02T19:54:41+00:00

globalnum = 0 n = 1 class T( threading.Thread ): def run( self ):

  • 0
globalnum = 0
n = 1

class T( threading.Thread ):
  def run( self ):
    global globalnum
    globalnum += n

for _ in xrange( 0, 999 ):
  t = T()
  t.start()

print globalnum

the result is 999
In my test i seems += thread safe
My question is: is += really thread safe?

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  1. Editorial Team
    Editorial Team
    2026-06-02T19:54:46+00:00Added an answer on June 2, 2026 at 7:54 pm

    += is not threadsafe (source).

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