How do I get the index 2-4 of a String in each entry of a column?

I have a column in a dataframe and need for every entry just the index 2-4 of the string.
For example

A
AB101CD
AB101CD
AB101CD

result:

A
101
101
101

>Solution :

You could use df.column.apply

import pandas as pd    
a = ['AB101CD','AB101CD','AB101CD']
df = pd.DataFrame(a)
df.columns = ['A']
df.A.apply(lambda x:x[2:5])

This gives:

0    101
1    101
2    101
Name: A, dtype: object

You could set it as column:

 df.A = df.A.apply(lambda x:x[2:5])