python 线程共享变量
#!/usr/bin/env python"""
多线程中的变量是所有线程中共享的
"""
import threading ,time
a = 50
b=50
c=50
d=50
def printvars():
print "a =",a
print "b =",b
print "c =",c
print "d =",d
def threadcode():
global a, b, c, d
a+=50
b = b+50
c= 100
d = "hello"
print " values of variables in child thread:"
printvars()
print " values of variables before child thread:"
printvars()
t = threading.Thread(target = threadcode, name = "childthread")
t.setDaemon(1)
t.start()
t.join()
print " values of variables after child thread:"
printvars()
输出：
values of variables before child thread:
a = 50
b = 50
c = 50
d = 50
values of variables in child thread:
a = 100
b = 100
c = 100
d = hello
values of variables after child thread:
a = 100
b = 100
c = 100
d = hello
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