import json
def deepclone(dictvalue):
if isinstance(dictvalue, list) or isinstance(dictvalue, set):
return [deepclone(v) if type(v).__name__ in ["list", "set", "tuple", "dict"] else v for v in dictvalue]
elif isinstance(dictvalue, dict):
return
elif isinstance(dictvalue, tuple):
return (deepclone(v) if type(v).__name__ in ["list", "set", "tuple", "dict"] else v for k, v in dictvalue)
else:
raise exception("type of value must is in [list, set, tuple, dict] ")
# is 比較的是記憶體位址
# == 比較的是值
a, b = none, none
print(id(a), id(b))
dict1 =
dict2 = dict1
print("dict=>a " + ("淺複製" if dict1 is dict2 else "深複製"))
dict1 =
dict2 = dict1.copy()
print("copy() dict=>a " + ("淺複製" if dict1 is dict2 else "深複製"))
dict1 =
dict2 = json.loads(json.dumps(dict1, ensure_ascii=false), encoding='utf-8')
print("json dict=>a " + ("淺複製" if dict1 is dict2 else "深複製"))
dict1 = , "b": 2}
dict2 = dict1.copy()
print("copy() dict=>a=>a1 " + ("淺複製" if dict1["a"] is dict2["a"] else "深複製"))
dict1 = , "b": 2}
dict2 = deepclone(dict1)
print("deepclone() dict=>a=>a1 " + ("淺複製" if dict1["a"]
is dict2["a"] else "深複製"))
dict1 = , "b": 2}
dict2 = json.loads(json.dumps(dict1, ensure_ascii=false), encoding='utf-8')
print("json dict=>a=>a1 " + ("淺複製" if dict1 is dict2 else "深複製"))
arr1 = [1, 2, 3]
arr2 = arr1
print("list=>item "+("淺複製" if arr1 is arr2 else "深複製"))
arr1 = [1, 2, 3]
arr2 = arr1.copy()
print("copy() list=>item "+("淺複製" if arr1 is arr2 else "深複製"))
arr1 = [1, 2, 3]
arr2 = json.loads(json.dumps(arr1, ensure_ascii=false), encoding='utf-8')
print("json list=>item "+("淺複製" if arr1 is arr2 else "深複製"))
arr1 = [1, 2, 3]
arr2 = deepclone(arr1)
print("deepclone() list=>item "+("淺複製" if arr1 is arr2 else "深複製"))
arr1 = [[1, 2], 2, 3]
arr2 = arr1.copy()
print("copy() list=>list=>item "+("淺複製" if arr1[0] is arr2[0] else "深複製"))
arr1 = [[1, 2], 2, 3]
arr2 = deepclone(arr1)
print("deepclone() list=>list=>item "+("淺複製" if arr1[0] is arr2[0] else "深複製"))
arr1 = [set([1, 2]), 2, 3]
arr2 = arr1.copy()
print("copy() list=>set=>item "+("淺複製" if arr1[0] is arr2[0] else "深複製"))
arr1 = [set([1, 2]), 2, 3]
arr2 = deepclone(arr1)
print("deepclone() list=>set=>item "+("淺複製" if arr1[0] is arr2[0] else "深複製"))
arr1 = [, 2, 3]
arr2 = arr1.copy()
print("copy() list=>dict=>item "+("淺複製" if arr1[0] is arr2[0] else "深複製"))
arr1 = [, 2, 3]
arr2 = deepclone(arr1)
print("deepclone() list=>dict=>item "+("淺複製" if arr1[0] is arr2[0] else "深複製"))
140734991645920 140734991645920
dict=>a 淺複製
copy() dict=>a 深複製
json dict=>a 深複製
copy() dict=>a=>a1 淺複製
deepclone() dict=>a=>a1 深複製
json dict=>a=>a1 深複製
list=>item 淺複製
copy() list=>item 深複製
json list=>item 深複製
deepclone() list=>item 深複製
copy() list=>list=>item 淺複製
deepclone() list=>list=>item 深複製
copy() list=>set=>item 淺複製
deepclone() list=>set=>item 深複製
copy() list=>dict=>item 淺複製
deepclone() list=>dict=>item 深複製
直接賦值是進行淺複製的
copy() 只能進行第一級的深複製
使用json進行序列化後再解析可以實現深複製
json的方式效率不高 推薦使用文中的deepclone 方法
淺複製與深複製
舉個複製 的例子 function clone p,s for var prop in p return s var a var b clone a,b b.hobby 1 reading b.hobby 1 reading c.hobby 1 reading 由上面的例子可以看出，當執行淺複製時，...
深複製與淺複製
2者主要區別 是否為成員變數分配新記憶體空間 複製建構函式有2種 深複製與淺複製 當將乙個物件a複製給另乙個物件b時，系統會呼叫複製建構函式 編譯器預設的複製建構函式是淺拷貝，它將原物件的每乙個成員變數複製到新物件的成員變數中去。因而最後兩個物件的變數均指向相同的資料成員的記憶體位址。當資料成員中沒...
淺複製與深複製
1.淺複製 被複製物件的所有變數都含有與原來的物件相同的值,而其所有的對其他物件的引用都仍然指向原來的物件。說明 乙個物件中的資料成員 include using namespace std class test test const test c 複製建構函式，提供乙個同型別物件作為引數 void...