[PyFeyn] a working few line example?

[Galata]

Hello,
  I just downloaded and installed the pyfeyn package. It's really 
surprising though that not a single few line example can be found in the 
site, I basically cannot use it at all. In the section "Examples" you 
put just figures of nice diagrams , but one can find those in any 
particle physics book. Why not putting the corresponding code? Unless 
it's there and I haven't seen it, in which case I apologize.
cheers
Salvatore