[Tutor] Query regarding file conversion - DOT files

[Mats Wichmann]

On 1/8/20 10:42 AM, Alan Gauld via Tutor wrote:
> On 08/01/2020 12:56, Niharika Jakhar wrote:
> 
>> I came across pydot for this and tried following:
>> #####code####
>> import os
>> import pydot
>> (graph,) = pydot.graph_from_dot_file('hello.dot')
>> graph.write_png('hellow.png')
>>
>> Error:
>>   assert process.returncode == 0, process.returncode
>>
>> AssertionError: 1
> 
> Please, always post the full error trace, do not summarize
> or shorten it. They contain a lot of useful detail and
> without it we are only making guesses.

what he said :)

Is graphviz installed? I believe pydot and its descendants (like 
pydotplus) require an installation of graphviz, which does not come in 
when you install pydot*.

if the failure comes from the graph.write_png call - we can't tell 
because the proper error trace is missing - this may well be the issue, 
it's either not installed, or not found.