python - Changing multiple positions in a list -
i have string want manipulate @ every position throughout it's length. for example, have string looks this: string1 = 'aatgcatt' i want create list change 1 position @ time either a, t, c, or g. thinking of using approach so: liststring = list(string1) changedstrings = [] pos in range(2, len(liststring) - 2): ##i don't want change first , last characters of string if liststring[pos] != 'a': liststring[pos] = 'a' random1 = "".join(liststring) changedstrings.append(random1) i thinking of using similar approach append rest of changes (changing rest of positions g,c, , t) list generated above. however, when print changedstrings list, appears code changes of positions after first two. wanted change position 3 'a' , append list. change position 4 'a' , append list , on give me list so: changedstrings = ['aaagcatt', 'aatacatt', 'aatgaatt'] any suggestions? ...