Python向TXT文件追加字符串时仅写入首字母的问题排查及解决求助

各位好，我最近在写一个小脚本，想把words_alpha.txt里的单词按长度分类，分别追加写入到1.txt到8.txt这些文件里（长度1的单词进1.txt，以此类推）。但运行后发现一个奇怪的问题：每个文件里只写入了单词的首字母，而不是整个单词，我实在搞不清哪里出问题了，想请大家帮我看看！

先贴一下我的代码片段：

with open("words_alpha.txt", 'r') as f:
  your_result = [line.split(',') for line in f.read().splitlines()]

for i in your_result:
  for word in i:
    x = len(word)
    print(word)
    if x == 1:
      with open("1.txt", "a") as myfile:
        myfile.write(word)
    if x == 2:
      with open("2.txt", "a") as myfile:
        myfile.write(word)
    if x == 3:
      with open("3.txt", "a") as myfile:
        myfile.write(word)
    if x == 4:
      with open("4.txt", "a") as myfile:
        myfile.write(word)
    if x == 5:
      with open("5.txt", "a") as myfile:
        myfile.write(word)
    if x == 6:
      with open("6.txt", "a") as myfile:
        myfile.write(word)
    if x == 7:
      with open("7.txt", "a") as myfile:
        myfile.write(word)
    if x == 8:
      with open("8.txt", "a") as myfile:
        myfile.write(word)
# 后面对应更长长度的判断逻辑和上面一致

我本来以为print(word)能正常输出整个单词，那写入文件应该也没问题，但实际打开生成的txt文件，里面只有每个单词的第一个字母。比如原文件里的"apple"，应该写入5.txt，但5.txt里只有"a"，这可把我愁坏了。

我先自己排查了几点：

• 确认words_alpha.txt里的单词都是完整的，没有奇怪的分隔符；
• print(word)确实能打出整个单词，说明读取的时候应该是拿到了完整的字符串；
• 也试过用myfile.write(word + '\n')，结果还是只写首字母加换行，整个单词没进去。

有没有大佬能帮我分析下问题出在哪？或者有没有更合理的写法能实现我的需求？麻烦大家了！

备注：内容来源于stack exchange，提问作者Soapy