Python - csv file is empty after using csv writer

Python newbie here. I was trying to troubleshoot an issue with writing a csv file in a larger program and decided to go back to basics to try to find the problem.

I ran an exact code example from the Python csv reading and writing documention:

import csv     
spamWriter = csv.writer(open('eggs.csv', 'w'), delimiter=' ', quotechar='|')    
spamWriter.writerow(['Spam'] * 5 + ['Baked Beans'])
spamWriter.writerow(['Spam', 'Lovely Spam', 'Wonderful Spam'])

When I go to my working directory and click on "eggs.csv" the file is empty is reported as being "0 kb". This same thing was happening in my larger program (empty csv files). Am I missing something completely obvious?

Thank you!

EDIT:
I just tried modified the code to:

import csv
csvOut=open("eggs.csv", "wb")
spamWriter = csv.writer(csvOut, delimiter=' ', quotechar='|')
spamWriter.writerow(['Spam'] * 5 + ['Baked Beans'])
spamWriter.writerow(['Spam', 'Lovely Spam', 'Wonderful Spam'])
csvOut.close()

And this worked. I am not sure why the first doesn't work for me.