9.赋值的影响

import copy

a = 11
print(id(a))#和下面的id号不一样
b = a
a = 12
print(b,id(a),id(b))#11 1810457152 1810457120
#输出结果:11  无影响

#浅拷贝copy.copy

#1.=赋值
download_list = [11,22,33]
copy_list = download_list
download_list.append(44)
print(copy_list)
#输出结果:[11,22,33,44] 有影响