如何按行获取列表中str项目的所有组合python

Question

I have a fasta file as below:

>seq1
AAAAAAAA
>seq2
TTTTTTTT
>seq3
CCCCCCCC
>seq4
GGGGGGGG

I want to get all combinations of the lines (except the ones that start with > sign) . The desired output should be:

AAAAAAAA
TTTTTTTT

AAAAAAAA
CCCCCCCC

AAAAAAAA
GGGGGGGG

TTTTTTTT
CCCCCCCC

TTTTTTTT
GGGGGGGG

CCCCCCCC
GGGGGGGG

My piece of code is here but the last step of making combinations is missing:

from Bio import SeqIO

list1=[]
with open('file1.fa', 'r') as file1:
    for record1 in SeqIO.parse(file1, 'fasta'):
        list1.append(record1.seq)


for i in list1:
    print(i)

Thank you

Answer 1

try

from itertools import combinations as com

lst = ['A', 'B', 'C', 'D']
combi = list(com(lst, 2))

for entry in combi:
    print(entry[0])
    print(entry[1])
    print()

output

A
B

A
C

A
D

B
C

B
D

C
D