Docutils allows to conveniently write and generate documents in various output formats (see installation details here):
.. uml::
actor User
participant "First Class" as A
participant "Second Class" as B
participant "Last Class" as C
User -> A: DoWork
activate A
You can pass a filename for the image (WITHOUT extension) as an optional parameter.
.. uml:: uml2/myDiagram123
actor User
participant "First Class" as A
participant "Second Class" as B
participant "Last Class" as C
User -> A: DoMoreWork
activate A