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Why am I getting no attribute __getitem__ error for dictionary:

Traceback (most recent call last):
  File "./thumbnail.py", line 39, in <module>
    main()
  File "./thumbnail.py", line 19, in main
    options['input_pattern']
AttributeError: Values instance has no attribute '__getitem__'
Here's the code:
#!/usr/bin/env python
import os, sys, glob
from PIL import Image
from optparse import OptionParser
def batch_convert(src_dir, input_pattern, output_ext = None, dest_dir = None):
    return 0
def main():
    print sys.argv
    parser = OptionParser()
    parser.add_option("-s", "--source-dir", dest="src_dir", help="Source directory to fetch images")
    parser.add_option("-d", "--dest-dir", dest="dest_dir", help="Destination directory to writen processed images")
    parser.add_option("-i", "--input-pattern", dest="input_pattern", help="Look for files that match some pattern. E.g. *.png or pic*cool*")
    parser.add_option("-o", "--output-format", dest="output_ext", help="Output format to save all images. If empty, original format of images is preserved")
    (options, args) = parser.parse_args()
    print options
    options['input_pattern']
if __name__ == "__main__":
    main()
As another user said, options is not a dictionary. I made this mistake myself. 
If I have an option 
--file FILE
Then I can call 
option.file
which returns FILE. It's that easy!
        
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