The following example shows how suites, families and tasks are added to a Python definition file.
import ecflow
if _name_ == "_main_":
defs = ecFlow.Defs() # create an empty definition
suite = defs.add_suite("s1"); # create a suite and add it to the defs
family = suite.add_family("f1") # create a family and add it to suite
for i in [ "a", "b", "c" ]: # create task ta,tb,tc
family.add_task( "t" + i) # create a task and add to family
defs.save_as_defs("my.def") # save defs to file "my.def"