需要帮助创建新列 pandas。形状记忆合金

Question

我对 python 金融编程很感兴趣。我一直在学习本教程 https://youtu.be/myFD0np9eys，但在视频的第 17 分钟尝试添加移动平均线列时卡住了。我按照确切的代码但是得到了错误：用户警告：Pandas 不允许通过新属性名称创建列 - 请参阅 https://pandas.pydata.org/pandas-docs/stable/indexing.html#attribute-access df.smaString=df.iloc[:,4].rolling(window=ma).mean()

这是我的代码：

import yfinance as yf

import datetime as dt
from pandas_datareader import data as pdr

yf.pdr_override()

stock=input("Enter a stock ticker symbol: ")
print(stock)

startyear=2022
startmonth=1
startday=1

start=dt.datetime(startyear,startmonth,startday)

now=dt.datetime.now()

df=pdr.get_data_yahoo(stock,start,now)

print(df)

ma=50

smaString="Sma_"+str(ma)

df.smaString=df.iloc[:,4].rolling(window=ma).mean()

df=df.iloc[ma:]

print(df)

Answer 1

错误的原因是新列名的做法不对。我认为 [] 是使用字符串变量作为新列名称所必需的。

smaString="Sma_"+str(ma)
df[smaString] = df.iloc[:,4].rolling(window=ma).mean()

    　　　　　Open   High    Low     Close   Adj Close   Volume  Sma_50

Date                            
2021-03-16  125.699997  127.220001  124.720001  125.570000  124.987122  115227900   129.172046
2021-03-17  124.050003  125.860001  122.339996  124.760002  124.180885  111932600   129.083321
2021-03-18  122.879997  123.180000  120.320000  120.529999  119.970512  121229700   128.878586
2021-03-19  119.900002  121.430000  119.680000  119.989998  119.433022  185549500   128.750759
2021-03-22  120.330002  123.870003  120.260002  123.389999  122.817245  111912300   128.604747

需要帮助创建新列 pandas。形状记忆合金

Need help creating a new column with pandas. SMA

python

pandas

yfinance