[PYTHON] 3 Monate Schichtdaten n Monate Schichtdaten

import datetime
from dateutil.relativedelta import relativedelta

#Machen Sie einen Begriff später
df["period1"] = df["Abrechnungsdatum"]
df_target = df[["Ticker","period1","Marktwert"]].copy()
df_target.columns = ["Ticker","period1","period1ago"]
df_target["period1"] = df_target["period1"].dt.to_pydatetime()+ relativedelta(months=3)
df = pd.merge(df,df_target,how="inner",on=("Ticker","period1"))
df

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