编程实现全部替换

#编程实现全部替换
file_name = input('请输入文件名:')
aim_word = input('请输入需要替换的单词或者字符:')
new_word = input('请输入新的单词或者字符:')
count = 0
f = open(file_name)
content = []

for each_line in f:
    for each_word in each_line:
        if  each_word == aim_word:
            count+=1
        
    each_line=each_line.replace(aim_word,new_word)
    content.append(each_line)

f.close()

print('文档共有%d个【%s】'% (count,aim_word))
print('您确定要将【%s】替换为【%s】吗？'% (aim_word, new_word))
decide = input('【Yes/No】:')

if decide == 'yes':
    g = open(file_name,'w')
    g.writelines(content)
    g.close()
    print('恭喜！所有的【%s】已替换完成！'% aim_word)
else:
    print('程序退出！')