在Python中，变量赋值与拷贝的方法有以下几种：
a = 10 b = a
import copy a = [1, 2, 3] b = copy.copy(a)
import copy a = [1, 2, [3, 4]] b = copy.deepcopy(a)
a = [1, 2, 3] b = a[:]
