Cómo recorrer la estructura de datos de un global de IRIS desde Python usando el SDK nativo de IRIS para Python

InterSystems IRIS 2022.2 tiene un SDK nativo para Python (https://docs.intersystems.com/iris20222/csp/docbook/Doc.View.cls?KEY=PAG...).

Sabemos cómo recorrer la estructura de datos de un global usando la función $Order de ObjectScript.

SET key=""
   FOR  {
     SET key=$ORDER(^myglobal(key)) 
     QUIT:key=""
     WRITE !,^myglobal(key)
   }

¿Cómo hacer lo mismo desde Python usando el SDK nativo de IRIS para Python?

Aquí va un ejemplo directamente en Python:

import iris

args = {'hostname':'127.0.0.1', 'port':51772,
    'namespace':'USER', 'username':'_SYSTEM', 'password':'SYS'
    }

conn = iris.connect(**args)

# Create an iris object
irispy = iris.createIRIS(conn)

# Create a global array in the USER namespace on the server
irispy.set('A', 'root', 'foo', 'SubFoo')

irispy.set(123, 'root', 'bar', 'lowbar', 'UnderBar')
irispy.set(124, 'root', 'bar', 'lowbar', 'UnderBar2')
irispy.set("hi", 'root', 'bar', 'lowbar')
irispy.set("hi again", 'root', 'bar3')

# Read the values from the database and print them
subfoo_value = irispy.get('root', 'foo', 'SubFoo')
underbar_value = irispy.get('root', 'bar', 'lowbar', 'UnderBar')
underbar2_value = irispy.get('root', 'bar', 'lowbar', 'UnderBar2')
lowbar_value = irispy.get('root', 'bar', 'lowbar')
bar3_value = irispy.get('root', 'bar3')

print('Created two values: ')

print('   root("foo","SubFoo")=', subfoo_value)
print('   root("bar","lowbar","UnderBar")=', underbar_value)
print('   root("bar","lowbar","UnderBar2")=', underbar2_value)
print('   root("bar","lowbar")=', lowbar_value)
print('   root("bar3")=', bar3_value)

direction = 0 # direction of iteration (boolean forward/reverse)
next_sub = chr(0) # start at first possible subscript
subs = []

print("\n Iterating root \n")

isDef = irispy.isDefined('root', *subs)

while isDef:

    next_sub = irispy.nextSubscript(False, 'root', *subs, next_sub) # get first subscript
    if next_sub == None: # we finished iterating nodes on this tree branch, move a level up
        if len(subs) == 0: # no more things to iterate
            break
        next_sub = subs.pop(-1) # pop last subscript in order to continue iterating this level
        if irispy.isDefined('root', *subs, next_sub) == 11:
            print('root(',*subs, next_sub, ')=',irispy.get('root', *subs, next_sub))
            continue
        continue
    isDef = irispy.isDefined('root', *subs, next_sub)

    if isDef in [10, 11]: # keep building subscripts for depth first search
        subs.append(next_sub)
        next_sub = chr(0)
        continue
    elif isDef == 1: # reached a leaf node, print it
        print('root(',*subs, next_sub, ')=',irispy.get('root', *subs, next_sub))
    else: # def 0 is not really expected
         print("error")
         irispy.kill('root')
         conn.close()
         exit(-1)

        

# Delete the global array and terminate
irispy.kill('root') # delete global array root
conn.close()