在python多线程开发中，全局变量是多个线程共享的数据，局部变量是各自线程的，非共享的。
如下几种写法都是可以的：
第一种：将列表当成参数传递给线程
from threading import Thread import time def work1(nums): nums.append(44) print("----in work1---",nums) def work2(nums): #延时一会，保证t1线程中的事情做完 time.sleep(1) print("----in work2---",nums) if __name__==‘__main__‘: g_nums = [11, 22, 33] t1 = Thread(target=work1, args=(g_nums,)) #这种写法是将列表当成参数传递 t1.start() t2 = Thread(target=work2, args=(g_nums,)) t2.start()
第二种：不传递，直接用
from threading import Thread import time def work1(): nums.append(44) print("----in work1---",nums) def work2(): #延时一会，保证t1线程中的事情做完 time.sleep(1) print("----in work2---",nums) if __name__==‘__main__‘: nums = [11, 22, 33] t1 = Thread(target=work1) t1.start() t2 = Thread(target=work2) t2.start()
结果都一样：
对于参数是字符串，数字这种不可变类型的变量
，改变变量的值的时候，要用上global，否则程序报错。
from threading import Thread import time def work1(): global nums nums+1 print("----in work1---",nums) def work2(): #延时一会，保证t1线程中的事情做完 time.sleep(1) print("----in work2---",nums) if __name__==‘__main__‘: nums = 12 t1 = Thread(target=work1) t1.start() t2 = Thread(target=work2) t2.start()
结果：
from threading import Thread import time def work1(nums): nums=nums+1 print("----in work1---",nums) def work2(nums): #延时一会，保证t1线程中的事情做完 time.sleep(1) print("----in work2---",nums) if __name__==‘__main__‘: g_nums = 11 t1 = Thread(target=work1, args=(g_nums,)) t1.start() t2 = Thread(target=work2, args=(g_nums,)) t2.start()
结果：
from threading import Thread import time def work1(nums): nums+1 print("----in work1---",nums) def work2(nums): #延时一会，保证t1线程中的事情做完 time.sleep(1) print("----in work2---",nums) if __name__==‘__main__‘: g_nums = 11 t1 = Thread(target=work1, args=(g_nums,)) t1.start() t2 = Thread(target=work2, args=(g_nums,)) t2.start()
结果：
原文：https://www.cnblogs.com/sdadx/p/9562618.html