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The Defs, Suite, Family, and Task form a node hierarchy: Every Suite, Family, and Task must have a name. This name must be unique between the peers.

The following example shows different ways of adding node hierarchy(they produce identical definitions)

Old style
import ecflow
defs = ecflow.Defs()
s = ecflow.Suite('s1')
f = ecflow.Family('f1')
t = ecflow.Task('t1')
defs.add_suite(s)
s.add_family(f)
f.add_task(t)
functional style
from ecflow import *
defs = Defs()
defs.add_suite('s1').add_family('f1').add_task('t1')
Constructor(Preferred)
from ecflow import *
defs = Defs( 
  Suite('s1',
   Family('f1',
      Task('t1'))))
Using Add
from ecflow import *
defs = Defs().add(
  Suite('s1').add(
   Family('f1').add(
      Task('t1'))))
Using + with parenthesis
from ecflow import *
defs = Defs() + (Suite('s1') + (Family('f1') + Task('t1')))
Hybrid. mix and match. Uses += and +
from ecflow import *
defs = Defs(Suite('s1'))
defs.s1 += Family('f1') + Task('t1')


The following example shows how a group of tasks could be created in 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("test.def")      # save defs to file "test.def" 


The following examples show alternative styles of adding suites, families, and tasks: They produce exactly the same suite as above.

from ecflow import *
defs = Defs(
      Suite("s1",
       Family("f1",
         [ Task("t{}".format(t)) for t in ("a", "b", "c")])))
defs.save_as_defs("test.def")    
from ecflow import *
defs = Defs().add( 
         Suite("s1").add(
            Family("f1").add(
               [ Task("t{}".format(t)) 
                 for t in ("a", "b", "c")])))     
defs.save_as_defs("test.def")    
from ecflow import *
defs = Defs()
defs += Suite("s1") 
defs.s1 += Family("f1") 
defs.s1.f1 += [ Task("t{}".format(t)) 
                for t in ("a", "b", "c")] 
defs.save_as_defs("test.def")     

In the third example above we use 'defs.s1.f1' to reference a node by name. This is useful in small designs but will produce maintenance issues in large designs IF the node names are changed.


The following example adds 5 suites, with 5 families with 5 tasks. However, care needs to be taken, to ensure that python is readable. It is recommended that you check your results

from ecflow import *
defs = Defs( 
           [ Suite("s{0}".format(i),
               [ Family("f{0}".format(i),
                    [ Task("t{0}".format(i)) for i in range(1,6)] )
                for i in range(1,6)]  ) 
            for i in range(1,6) ] )
assert(len(defs)==5, " expected 5 suites but found " + str(len(defs)))
for suite in defs:
   assert(len(suite)==5, " expected 5 families but found " + str(len(suite)))
   for fam in suite:
      assert(len(fam)==5, " expected 5 tasks but found " + str(len(fam)))