Python 赋值 深拷贝 浅拷贝

 

 

a = [1,2,[1,2]]
b=a
print(id(a),id(a[0]),id(a[1]),id(a[2]),id(a[2][0]),id(a[2][1]))
print(id(b),id(b[0]),id(b[1]),id(b[2]),id(b[2][0]),id(b[2][1]))

666431107520 140726633641760 140726633641792 666417288256 140726633641760 140726633641792
666431107520 140726633641760 140726633641792 666417288256 140726633641760 140726633641792

a = [1,2,[1,2]]
b=a.copy()
print(id(a),id(a[0]),id(a[1]),id(a[2]),id(a[2][0]),id(a[2][1]))
print(id(b),id(b[0]),id(b[1]),id(b[2]),id(b[2][0]),id(b[2][1]))

666407665024 140726633641760 140726633641792 666435970240 140726633641760 140726633641792
667856624768 140726633641760 140726633641792 666435970240 140726633641760 140726633641792

a = [1,2,[1,2]]
b=copy.deepcopy(a)
print(id(a),id(a[0]),id(a[1]),id(a[2]),id(a[2][0]),id(a[2][1]))
print(id(b),id(b[0]),id(b[1]),id(b[2]),id(b[2][0]),id(b[2][1]))

666431107520 140726633641760 140726633641792 666417288256 140726633641760 140726633641792
666433391040 140726633641760 140726633641792 666431582976 140726633641760 140726633641792

对于无嵌套的列表，copy和deepcopy的效果相同

 

参考链接：https://www.cnblogs.com/wulaa/p/7896201.html