[Django]-Django sign item with some extra values

Use %% in format string to get % symbol

'&p=myvar%%3D%s' % 'value'

I hope I understand you.

Also you can use urllib.urlencode

>>>urllib.urlencode({'i':'fundedbyme', 'p':'myvar=%s' % myvalue})
'i=fundedbyme&p=myvar%3Dmyvalue'