python-文件读取与写入

以下代码测试通过
#文件的读取与写入
str1 = input('请输入任意字符：')
list1 = []#存储字条串
list2 = []#存储整型数据
for i in str1:
    if i.isdigit():
        list2.append(int(i))
    else:
        list1.append(i.upper())
print(list1)
print(list2)
f = open(r'C:\Users\Administrator\Desktop\myfile.txt','a')
for i in list1:
    f.write(i)
f.close()