make iplot() work in http://cloud.sagemath.com

Author: haraldschilly

Diff for: plotly/plotly.py

@@ -41,7 +41,14 @@ def iplot(self, *args, **kwargs):
 		res = self.__callplot(*args, **kwargs)
 		width = kwargs.get('width', 600)
 		height = kwargs.get('height', 600)
-		s = '<iframe height="'+str(height+50)+'" id="igraph" scrolling="no" seamless="seamless" src="'+res['url']+'/'+str(width)+'/'+str(height)+'" width="'+str(width+50)+'"></iframe>'
+		s = '<iframe height="%s" id="igraph" scrolling="no" seamless="seamless" src="%s" width="%s"></iframe>' %\
+			(height+50, "/".join(map(str, [res['url'], width, height])), width+50)
+		try:
+			# see, if we are in the SageMath Cloud
+			from sage_salvus import html
+			return html(s, hide=False)
+		except:
+			pass
 		try:
 			from IPython.display import HTML
 			return HTML(s)