easy to write a bash_completion script file

.bash_completion

_server.py() 
{
    local cur prev opts base
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"

    #
    #  The first options should be a yaml config
    #

    if [ $COMP_CWORD -eq 1 ]; then
        COMPREPLY=( $(compgen -W "`ls -1 *.yaml 2>/dev/null`" -- ${cur}) )
        return 0
    fi

    #
    #  Complete the command
    #
    opts="startserver shell ishell help movefiles install script"

   COMPREPLY=($(compgen -W "${opts}" -- ${cur}))  
   return 0
}
complete -F _server.py server.py