filename = "实验中学学生花名册.txt"
with open(filename, "w") as f:
    f.write("黎明\n")
    f.write("方芳\n")

filename = "实验中学学生花名册.txt"
with open(filename, "r") as f:
    f.write("黎明\n")
    f.write("方芳\n")

filename = "实验中学学生花名册.txt"
with open(filename, "r+") as f:
    f.write("黎明\n")
    f.write("方芳\n")

filename = "实验中学学生花名册.txt"
with open(filename, "a") as f:
    f.write("黎明\n")
    f.write("方芳\n")