substring function to create new column

[Chandan]

Hi There,
I tried with the below code, but the results are not what I am expecting.

new_col=[]

for i in df["id"]:
    if i[1:3].lower()in ('a1','b2'):
        new_col=df["direction"].str.split(',').str[0]
    elif i[1:3].lower()in ('c3','d4'):
        new_col=df["direction"].str.split(',').str[1]
    elif i[1:3].lower()in ('e5','f6'):
        new_col=df["direction"].str.split(',').str[2]
    elif i[1:3].lower()in ('g7','h8'):
        new_col=df["direction"].str.split(',').str[3]
        
df["position"]=new_col
print(df)

Output:
       id                 direction position
0  aa11bc  north, south, east, west     west
1  bb22cd  north, south, east, west     west
2  cc33ef  north, south, east, west     west
3  dd44gh  north, south, east, west     west
4  ee55ij  north, south, east, west     west
5  ff66kl  north, south, east, west     west
6  gg77mn  north, south, east, west     west
7  hh88op  north, south, east, west     west

Please advise.