This is the Graphviz module itself which is not necessarily expected to be built
and available when the test suite is run.
#!/usr/bin/env python3
-import gv
+import gv # pylint: disable=import-error
g = gv.digraph("G")
n = gv.node(g,"hello")
# author: Michael Hohn <mhhohn@lbl.gov>
# based on: modgraph.tcl by John Ellson <ellson@research.att.com>
-import gv
+import gv # pylint: disable=import-error
modules = open("/proc/modules", "r").readlines()
#!/usr/bin/env python3
-import gv
+import gv # pylint: disable=import-error
def main():
#!/usr/bin/env python3
-import gv
+
+import gv # pylint: disable=import-error
# create a new empty graph
G = gv.digraph("G")
#!/usr/bin/env python3
-import gv
+import gv # pylint: disable=import-error
g = gv.digraph("G")
print(gv.setv(g,"aaa","xxx"))