[Python] how do i replace a query with a new value in urlparse?

so I have a data as follows:

item = '//s780.scene7.com/is/image/forever/301596014_001?hei=98&wid=98'


using urlparse module. how can i replace the above data with a new size to make it look like this:

item = '//s780.scene7.com/is/image/forever/301596014_001?hei=360&wid=360'

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