请大哥们帮忙找错 。解决方法

请大哥们帮忙找错 。。。
import   threading,   time,   sys

def   sleepandprint():
            time.sleep(1)
            print   "Hello   from   both   of   us. "

def   threadcode():
            stdout.write( "Hello   from   the   new   thread.   My   name   is   %s\n "   %
                                      threading.currentThread().getName())
            sleepandprint()

print   "Before   starting   a   new   thread,   my   name   is ",   \
            threading.currentThread().getName()

t   =   threading.Thread(target   =   threadcode,   name   =   "ChildThread ")

t.setDaemon(1)

t.start()
sys.stdout.write( "Hello   from   the   main   thread.   My   name   is   %s\n "   %
                          threading.currentThread().getName())
sleepandprint()

t.join()


不知道为什么   我去掉   IMPORT   SYS   或者加上   都会出现

NameError:   global   name   'stdout '   is   not   defined

[解决办法]
import sys
...
sys.stdout. ...

或者
from sys import stdout
...
stdout...