with open("cases.txt") as f:
    cases = f.read().strip().split("\n")

for k,v in enumerate(cases):
    print(f"{k+1},,{v}")
f10032e703535cd4e898481b06566cad26f15476
<mask token>

with open('cases.txt') as f:
    cases = f.read().strip().split('\n')
for k, v in enumerate(cases):
    print(f'{k + 1},,{v}')

with open("cases.txt") as f:
    cases = f.read().strip().split("\n")

for k,v in enumerate(cases):
    print(f"{k+1},,{v}")