How can call python in snippet?

[hwypengsir]

I want to expand ptest into welcome python in file ending with html,add lines in html.snippets(located in vim-snippets/UltiSnips):

snippet ptest
!p print("welcome python")
endsnippet

ptest expand into !p print("welcome python"),i rewrite the snippet as below then:

snippet ptest
`!p print("welcome python")`
endsnippet

ptest expand into nothing!

[smjonas]

Python interpolation will use the result from the Python expression, so you can simply use "welcome python".

It's not about what you print since print does not return anything.