Python程序运行一次后再次运行无反应是什么原因？

import os
import re
import csv

aa_codes = {'ALA':'A','CYS':'C','ASP':'D','GLU':'E',
'PHE':'F','GLY':'G','HIS':'H','LYS':'K','ILE':'I',
'LEU':'L','MET':'M','ASN':'N',
'PRO':'P','GLN':'Q','ARG':'R',
'SER':'S','THR':'T','VAL':'V','TYR':'Y','TRP':'W'}

def file_name(file_dir):
    return os.listdir(file_dir)

file_dir='D:\python代码\new - 副本'
files = file_name(file_dir)

def get_file(files):
    for file in files:
        res = []
        lst1 = []
        try:
            with open(os.path.join(file_dir, file), 'r') as f:  # 使用os.path.join确保路径正确
                txts = f.readlines()
                # 去除连续重复的行 (改进后的逻辑)
                cleaned_txts = []
                for i in range(len(txts)):
                    if i > 0 and txts[i].strip() == txts[i-1].strip():
                        continue
                    cleaned_txts.append(txts[i])
                txts = cleaned_txts

                for line in txts:
                    line = line.strip() # 去除行首尾空格
                    if line: # 忽略空行
                        parts = re.split(r's*,s*', line) # 使用更稳健的正则表达式分割
                        if len(parts) >= 6: # 检查是否有足够的数据
                            lst1.append([parts[3], parts[5]])

                for item in lst1:
                    if item[0] in aa_codes:
                        res.append(aa_codes[item[0]])

            with open(os.path.join(file_dir, file + '.csv'), 'w', newline='') as f: # 添加newline=''避免空行
                writer = csv.writer(f) # 使用csv模块写入csv文件，更可靠
                writer.writerow(res)

        except Exception as e:
            print(f"Error processing file {file}: {e}")

get_file(files)
print('OK')