glob.glob（）非常适合该任务。另外，with在处理文件时，请使用上下文管理器：
import csv
import glob
import os
directory = raw_input("INPUT Folder:")
output = raw_input("OUTPUT Folder:")
txt_files = os.path.join(directory, '*.txt')
for txt_file in glob.glob(txt_files):
with open(txt_file, "rb") as input_file:
in_txt = csv.reader(input_file, delimiter='=')
filename = os.path.splitext(os.path.basename(txt_file))[0] + '.csv'
with open(os.path.join(output, filename), 'wb') as output_file:
out_csv = csv.writer(output_file)
out_csv.writerows(in_txt)
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