##Input_layer=vector
##Output_1=output vector
##Produce_output_2=boolean
##Output_2=output vector

from qgis.core import *

def create_my_output(path):
    # whatever...

create_my_output(Output_1)

if Produce_output_2:
    create_my_output(Output_2)

##Input_layer=vector
##Output_1=output vector
##Output_2=output file
##Produce_output_2=boolean

processing.runalg("qgis:fixeddistancebuffer", Input_layer, 0.01, 10, False, Output_1)

if Produce_output_2 == True:
    processing.runandload("qgis:fixeddistancebuffer", Input_layer, 1.00, 10, False, Output_2)
else:
    pass