Window 在 Python dataframe 列中滑动 substring

Question

I have a sequence 'DEFGHI JKLM NOPQRS' as a row in a column which is also a substring of another column in a data frame.

Start Position of J = 7 and M = 10.

I need to create a new column such that it takes 5 letters before and after the start letter from J till M ie having a total length of 11:

EFGHI J KLMNO
FGHIJ K LMNOP
GHIJK L MNOPQ
HIJKL M NOPQR

I have tried this using R. I need suggestions to do the same in python for practice

Answer 1

Example:

s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
i = s.index('J')
j = s.index('O')
context = 7
for mid in range(i, 1+j):
    print(s[mid-context:mid+context+1])

Output:

CDEFGHIJKLMNOPQ
DEFGHIJKLMNOPQR
EFGHIJKLMNOPQRS
FGHIJKLMNOPQRST
GHIJKLMNOPQRSTU
HIJKLMNOPQRSTUV