Python 3.x Pandas.Series实例属性copy=的效果是什么？

下面是一个代码示例，它显示copy属性没有任何效果

其思想是用2个值实例化Pandas.系列，每个值都是整数列表。然后，我们修改一个列表和一个系列列表值，并分别检查修改是否应用于相应的列表和相应的系列列表值。对副本属性设置为False或True的实例化序列执行此操作对修改的应用程序没有影响

import numpy as np
import pandas as pd

l1 = [1, 2 ,3]
l2 = [4 ,5 ,6]
sr = pd.Series([l1, l2], copy=False)

print('Series created with copy attribute = False')

print('\nBefore modifying l1, l2 lists')
print('l1 list:\n', l1)
print('l2 list:\n', l2)
print('sr Series:\n', sr)

l1[0] = 10

print('\nAfter modifying l1 list')
print('l1 list:\n', l1)
print('l2 list:\n', l2)
print('sr Series:\n', sr)

sr[1][0] = 20

print('\nAfter modifying l2 list in sr Series')
print('l1 list:\n', l1)
print('l2 list:\n', l2)
print('sr Series:\n', sr)

l1 = [1, 2 ,3]
l2 = [4 ,5 ,6]
sr = pd.Series([l1, l2], copy=True)

print('\nSeries created with copy attribute = True. We see that copy=True has no effect !')

print('\nBefore modifying l1, l2 lists')
print('l1 list:\n', l1)
print('l2 list:\n', l2)
print('sr Series:\n', sr)

l1[0] = 10

print('\nAfter modifying l1 list')
print('l1 list:\n', l1)
print('l2 list:\n', l2)
print('sr Series:\n', sr)

sr[1][0] = 20

print('\nAfter modifying l2 list in sr Series')
print('l1 list:\n', l1)
print('l2 list:\n', l2)
print('sr Series:\n', sr)

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我的问题是：Series Instanceation copy=属性的效用是什么？

如果用于构造序列的数据集很大，并且不希望发生变异，则可以通过不将其复制到序列中来节省一些内存。