我已经玩了一段时间的python数组,但最近我遇到了一个奇怪的问题。这是我的代码:
import numpy as np
myarr = [
["s"],
["s"],
["w"],
["p"],
["m"],
["g"],
["c"]
]
newarr = list(myarr)
print(id(myarr))
print(id(newarr))
print(myarr, "myarr")
print(newarr, "newarr")
print("##### starting manipulation #########")
for i in newarr:
i[0] = "a"
print(myarr, "myarr")
print(newarr, "newarr")
我的问题是,即使我将“myarr”数组复制到一个名为“newarr”的新数组中,当我在“myarr”或“newarr”中进行一些更改时,它们都像引用的数组一样(引用相同的数组)内存地址),即使它们有不同的内存ID。
我尝试使用切片,甚至是arr.copy()方法,但它们都不起作用。
我只能在使用numpy数组时修复它。
newarr = np.array(myarr)
我的问题在哪里?
先感谢您:)
你需要使用deepcopy
from copy import deepcopy
myarr = [
["s"],
["s"],
["w"],
["p"],
["m"],
["g"],
["c"]
]
newarr = deepcopy(myarr)
print(myarr, "myarr")
print(newarr, "newarr")
print("##### starting manipulation #########")
for i in newarr:
i[0] = "a"
print(myarr, "myarr")
print(newarr, "newarr")
输出:
([['s'], ['s'], ['w'], ['p'], ['m'], ['g'], ['c']], 'myarr')
([['s'], ['s'], ['w'], ['p'], ['m'], ['g'], ['c']], 'newarr')
##### starting manipulation #########
([['s'], ['s'], ['w'], ['p'], ['m'], ['g'], ['c']], 'myarr')
([['a'], ['a'], ['a'], ['a'], ['a'], ['a'], ['a']], 'newarr')