Im using the plone cms and am having trouble with a python script. I get a name error "the global name 'open' is not defined". When i put the code in a seperate python script it works fine and the information is being passed to the python script becuase i can print the query. Code is below:

#Import a standard function, and get the HTML request and response objects.
from Products.PythonScripts.standard import html_quote
request = container.REQUEST
RESPONSE = request.RESPONSE



# Insert data that was passed from the form
query=request.query
#print query


f = open("blast_query.txt","w")
for i in query:
    f.write(i)

return printed

I also have a second question, can i tell python to open a file in in a certain directory for example, If the script is in a certain loaction i.e. home folder, but i want the script to open a file at home/some_directory/some_directory can it be done?