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def

Because the suite is already defined, you need to delete and reload it first:

ecflow_client --delete=_all_

def

Then restart the suite:

 ecflow_client --begin=

test

 ecflow_client --replace=/test test.def

or to replace part of the suite:

 ecflow_client --replace=/test/t2 test.def

Python

To delete the suite definition, reload and begin using the Client Server API: First update test.py to add task t2

import os
from ecflow import Defs,Suite,Task,Edit
   
print("Creating suite definition")
home = os.path.join(os.getenv("HOME"),  "course")
defs = Defs( 
        Suite('test',
            Edit(ECF_HOME=home),
            Task('t1'),
            Task('t2')))
print(defs)

print("Checking job creation: .ecf -> .job0")
print(defs.check_job_creation())

print("Saving definition to file 'test.def'")
defs.save_as_defs("test.def")

To delete all suites in the server and reload the modified test.def, we could update client.py

import ecflow 
   
print("Client -> Server: delete, then load a new definition")   
try:
    ci = ecflow.Client()
    ci.delete_all()           

start the suite
except RuntimeError as e:
    print("Failed:", e)

import ecflow 
   
print("Client -> Server: replacing suite '/test' in the server, with a new definition")
try:
    ci = ecflow.Client()
    ci.suspend("/test")              # so that we can resume manually in ecflow_ui
    ci.replace("/test", "test.def")  # replace suite /test with suite of same name in test.def
except RuntimeError as e:
    print("Failed:",   e) 

1. Suspend the suite using ecflow_ui or via python by modifying your client.py to add ecflow.Client.suspend
2. Create a new task
3. Create t2.ecf by copying from t1.ecf
4. Update python scripts test.py and client.py or test.def
5. Replace the suite
   python: python3 test.py     |  ./test.py
                 python3 client.py  |  ./client.py
   text:      ecflow_client --replace=/test test.def
6. Resume the suite using ecflow_ui
7. In ecflow_ui watch the two tasks running. They should run at the same time