[Python] Close all files opened in python module when the module is stopped abnormally

In my module, one block is coded like this:

# open a text file to which results obtained in MAINBLOCK will be written
write2file = open('myResults.txt','w')
# MAINBLOCK
write2file.close()


When running the module, I may interrupt the module in IDLE by Ctrl+C for program debugging or exceptions may be raised in MAINBLOCK, so the module is stopped abnormally. However, If I try to delete myResults.txt in Windows Explorer at the time, the message says:

The action can't be completed because the file is open in pythonw.exe


I think if the module is stopped abnormally, the file is still opening, am I right? How can I close all those open file identifiers in IDLE or by other ways?

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