Filling an Excel file

[starter_student]

I have an Excel file ... name, description, scope (column scope is fast empty)
and I want to assign a "code" (0, 1, 2 and 3) in each row of the scope column
when in the first_row 1,2 or all elements of the list l1 are also in the columns name and description
then scope.first_row = 0 and so on.

here is my code but it doesnt work

from pandas import ExcelWriter
import pandas as pd
df2 = pd.read_excel('file.xlsx', 'sheet1', na_values=['NULL'])
#df2

l1 = ["a", "b", "c"]
l2 = ["d", "e", "f"]
l3 = ["g", "h", "i"]
l4 = ["j", "k", "l"]


for ind in df2.index: 
    for i in l1:
        if l1[i] in df2.index and l1[i] in df2.index:
            df2["Scope"] = 0
#df2        
for ind in df2.index: 
    for i in l2:
        if l2[i] in df2.index and l2[i] in df2.index:
            df2["Scope"] = 1
#df2            
for ind in df2.index: 
    for i in l3:
        if l3[i] in df2.index and l3[i] in df2.index:
            df2["Scope"] = 2
            
#df2
for ind in df2.index: 
    for i in l4:
        if l4[i] in df2.index and l4[i] in df2.index:
            df2["Scope"] = 3

#df2    

writer = ExcelWriter('output_file.xlsx')
df2.to_excel(writer,'Sheet1',index=False)
writer.save() 

Can someone help me with this issue ... please