Df = some_preprocess(df) not working

Using Streamlit
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1

dear boss
see my code is get form Access edited data from st.data_editor - #5 by ssa_1998

see code

import streamlit as st
from pandas_datareader import data as web
session_state = st.session_state

dropdown = # code for st.selectbox()

if dropdown:
df= pd.read_csv(“c:\nfa\tcsv.csv”)

#some extra preprocessing and function calls

df = some_preprocess(df)

grouped_df = df.groupby("Group").agg({"column_1":"sum"})

grouped_df["col2"]=1



if "original_data" not in session_state:
    session_state.original_data= grouped_df

if "edited_data" not in st.session_state:
    session_state.edited_data= grouped_df.copy()


def save_edits():

    edited_df = session_state.edited_data

    #recalculation of col2 based on edits made in the table
    edited_df["col2"] = edited_df["col1"]+3

    session_state.edited_data=edited_df
    session_state.original_data=session_state.edited_data


with st.form("Table"):
    session_state.edited_data = st.data_editor(session_state.original_data,num_rows="dynamic")

    st.form_submit_button("Recalculate and save",on_click=save_edits)

but ths this line give me error

df = some_preprocess(df)

please give me right code
reard