来个大神哥哥救救孩子吧，

with open("text1.dat","r") as f:
    n = f.read()
    s = ""
    for i in n.split("\n"):
        for j in i[::-1]:
            s += j
        s += "\n"
    with open("text2.dat","w")as f:
        f.write(s)