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>>> from urllib.parse import*
>>> my_values = parse_qs('red=5 & blue=0 & green=', keep_blank_values=True)
>>> print(repr(my_values))
{'red': ['5 '], ' blue': ['0 '], ' green': ['']}
>>> print('Red: ', my_values.get('red'))
Red: ['5 ']
>>> print('Green: ', my_values.get('green'))
Green: None
>>> print('Opacity: ', my_values.get('opacity'))
Opacity: None
>>>
>>> red = my_values.get('red', ['']) [0] or 0
>>> green = my_values.get('green', ['']) [0] or 0
>>> opacity = my_values.get('opacity', ['']) [0] or 0
>>> print('Red: %r' % red)
Red: '5 '
>>> print('Green: %r' % green)
Green: 0
>>> print('Opacity: %r' % opacity)
Opacity: 0
>>>
>>> red = my_values.get('red', [''])
>>> print(red)
['5 ']
>>>