[Zope] how to open a file out of Zope and write into it?

hello everyone! I want to open a file out of Zope and write something into it,and I have done one program Python, but the error message is: global name 'open' is not defined. I don't known why. would you please help me? thank you! this is my program python ----------- request = container.REQUEST RESPONSE = request.RESPONSE fd=open('c:/file.txt', 'w') fd.write('hello') fd.close()