BUG: df1=df2.iloc[-1:] When a certain value of DF1 changes, the last line of DF2 follows DF1 on Pandas 2.1.3 #55988
Description
Pandas version checks
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I have checked that this issue has not already been reported.
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I have confirmed this bug exists on the latest version of pandas.
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I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
import pandas as pd
print(f'{day}日 初始Total_price2 {Stock_Holding_Total_Price_df}')
#day_Stock_Holding_Total_Price_df.loc[0]=Stock_Holding_Total_Price_df.iloc[-1]
day_Stock_Holding_Total_Price_df=Stock_Holding_Total_Price_df.iloc[-1:]
#day_Stock_Holding_Total_Price_df的date字段等于day
day_Stock_Holding_Total_Price_df.loc[0,'date']=day
print(f'{day}日 初始 day_Total_price{day_Stock_Holding_Total_Price_df}')
print(f'{day}日 赋值后的Total_price {Stock_Holding_Total_Price_df}')Issue Description
When a certain value of DF1 changes, the last line of DF2 follows DF1 on Pandas 2.1.3
Expected Behavior
DF2 will never change
Installed Versions
INSTALLED VERSIONS
commit : 2a953cf
python : 3.10.8.final.0
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.22621
machine : AMD64
processor : AMD64 Family 25 Model 80 Stepping 0, AuthenticAMD
byteorder : little
LC_ALL : None
LANG : None
LOCALE : Chinese (Simplified)_China.936
pandas : 2.1.3
numpy : 1.26.1
pytz : 2023.3.post1
dateutil : 2.8.2
setuptools : 63.2.0
pip : 23.3.1
Cython : None
pytest : None
hypothesis : None
...
zstandard : None
tzdata : 2023.3
qtpy : None
pyqt5 : None