from itertools import permutations
s = "abcd"
permutation = [''.join(e) for e in permutations(s)]
for s in permutation:
print(s)
'''
run:
abcd
abdc
acbd
acdb
adbc
adcb
bacd
badc
bcad
bcda
bdac
bdca
cabd
cadb
cbad
cbda
cdab
cdba
dabc
dacb
dbac
dbca
dcab
dcba
'''