python-熊猫：在两个索引值之间随机分割索引值

这是“ ISO第53周的问题”.

我有一个pandas Series实例,其索引值表示ISO周编号：

import pandas as pd
ts = pd.Series([1,1,2,3,2],index=[1,52,53,53])

我想将所有index = 53索引随机且均等地替换为index = 52或index = 1.

对于上述情况,可能是：

import pandas as pd
ts = pd.Series([1,1])

要么

import pandas as pd
ts = pd.Series([1,52])

例如.请问我该怎么做？

谢谢你的帮助.

编辑

在numpy中,我使用以下方法实现了这一点：

from numpy import where
from numpy.random import shuffle

indices = where(timestamps == 53)[0]
number_of_indices = len(indices)
if number_of_indices == 0:
    return #?no iso week number 53 to fix.
shuffle(indices) # randomly shuffle the indices.
midway_index = number_of_indices // 2
timestamps[indices[midway_index:]] = 52 # precedence if only 1 timestamp.
timestamps[indices[: midway_index]] = 1

其中timestamps数组是熊猫索引值.