python - How to filter all selected options? -

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i have these 5 options pull down menues:

<select name="image_style"> <select name="image_background"> <select name="image_activity"> <select name="image_merchandise"> <select name="image_type">

i want selected ones filtered. try this:

image_background = self.request.get("image_background") image_activity = self.request.get("image_activity") image_merchandise = self.request.get("image_merchandise") image_type = self.request.get("image_type")  items = image.all()  if image_style != "none":     items.filter("image_tags =", image_style) elif image_background != "none":     items.filter("image_tags =", image_background) elif image_activity != "none":     items.filter("image_tags =", image_activity) elif image_merchandise != "none":     items.filter("image_tags =", image_merchandise) elif image_type != "none":     items.filter("image_tags =", image_type) else:     self.response.out.write(""" select tags sort images""")  item in items:                                    self.response.out.write("""     <a href="%s"><image src="%s" height="110"> </a>  """ %      (item.image_url, item.image_source_url))

but in case, if image_style not "none" other filters not execute. how formulate selections executed. thanks.

build list tags of options, filter out non-selected (see lambda) , check if resulting list empty or not.

selects = filter(lambda x: x != "none",                [image_style, image_background, image_activity,                image_merchandise, image_type]           )  if selects:     choice in selects:         items.filter("image_tags =", choice) else:     self.response.out.write(""" select tags sort images""")

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