第一步：生成一个字典，关键字包含年龄，姓名，性别。

info = {"年龄": 0, "姓名": "", "性别": ""}

第二步：生成三个字典，并把他们追加到列表中。

info_list = []
info1 = {"年龄": 25, "姓名": "张三", "性别": "男"}
info2 = {"年龄": 30, "姓名": "李四", "性别": "女"}
info3 = {"年龄": 22, "姓名": "王五", "性别": "男"}

info_list.append(info1)
info_list.append(info2)
info_list.append(info3)

第三步：把列表用open()写入到内存中。

with open("info_list.txt", "w") as f:
    for info in info_list:
        f.write(str(info) + "
")

第四步：设计一个修改模块，能够修改他们的年龄姓名性别等。修改完后替换到内存中。

def update_info(old_info, new_info):
    old_info.update(new_info)
    return old_info

def load_info_from_file(file_path):
    with open(file_path, "r") as f:
        lines = f.readlines()
    info_list = [eval(line.strip()) for line in lines]
    return info_list

def save_info_to_file(file_path, info_list):
    with open(file_path, "w") as f:
        for info in info_list:
            f.write(str(info) + "
")

file_path = "info_list.txt"

# 加载内存中的字典列表
loaded_info_list = load_info_from_file(file_path)

# 更新字典信息
updated_info = update_info(loaded_info_list[0], {"年龄": 26, "姓名": "张三丰", "性别": "男"})

# 替换内存中的字典列表
save_info_to_file(file_path, [updated_info])