for i in img:
s = i.file[len(i.file)-5:len(i.file)]
if ((s.find('.jpg')>-1) | (s.find('.JPG')>-1) | (s.find('.jpeg')>-1) | (s.find('.JPEG')>-1) | (s.find('.png')>-1) | (s.find('.PNG')>-1) | (s.find('.bmp')>-1) | (s.find('.BMP')>-1)):
studDocs = studDocs + """<div id='doc"""+str(
i.id)+"""' class="col col-pd"><div class="img-box"><img class="img" src='"""+URL('bak','download',args=i.file)+"""'/><div class='del-img'></div></div></div>"""
elif ((s.find('.pdf')>-1) | (s.find('.PDF')>-1)):
studDocs = studDocs + """<div id='doc"""+str(
i.id)+"""' class="col col-pd"><div class="document"><p class="text-center expansion">.pdf</p><div class='del-img'></div></div></div>"""
elif ((s.find('.tif')>-1) | (s.find('.TIF')>-1)):
studDocs = studDocs + """<div id='doc"""+str(
i.id)+"""' class="col col-pd"><div class="document"><p class="text-center expansion">.tiff</p><div class='del-img'></div></div></div>"""