C:\Python27\python.exe D:/python-test/app_server.py
Traceback (most recent call last):
  File "D:/python-test/app_server.py", line 2, in <module>
    from wsgiref.simple_server import make_server
  File "C:\Python27\lib\wsgiref\simple_server.py", line 14, in <module>
    import urllib, sys
  File "C:\Python27\lib\urllib.py", line 30, in <module>
    import base64
  File "D:\python-test\base64.py", line 2, in <module>
    for key in base64:
TypeError: 'module' object is not iterable

Process finished with exit code 1