node and edge handle string input differently

[hodgett]

If I pass the string n1 = "http://brick.oclc.com.au:81/" to node g.node(n1) then it appears in the .gv file as "http://brick.oclc.com.au:81/". When I pass the same string to edge g.edge(n1,n2) it appears in the .gv file as http:"//brick.oclc.com.au":81/ which causes an error;
syntax error in line 3001 near '/'
The quotation marks get messed up. Why do the two functions handle the same string differently?

[xflr6]

The edge method currently accepts :-separated strings as node_ids (DOT language), currently splitting them naively into node, port, and compass (underdocumented unfortunately). AFAIU the DOT language principally allows port and compass also in node statements but they seem to be ignored, which is why the node method is different here.

The best current workaround is probably to use node names and labels where the wanted labels could contain colons:

In [1]: import graphviz
   ...: 
   ...: g = graphviz.Graph()
   ...: g.node('A', 'http://brick.oclc.com.au:81/')
   ...: g.node('B', 'spam')
   ...: g.edge('A', 'B')
   ...: g

Duplicate of #53 (see discussion there).