4.1 Dynamic placeholder - no cache

The template:

Dynamic variable:  $voom

The command line and the output:

% voom='Voom!' python x.py --env
Dynamic variable:  Voom!

The generated code:

write('Dynamic variable:  ')
write(filter(VFS(SL,"voom",1))) # generated from '$voom' at line 1, col 20.
write('\n')

Just what we expected, like any other dynamic placeholder.