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Evgeny Shvarov
Senior Startups and Community Programs Manager at InterSystems Corporation
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Question Evgeny Shvarov · Jun 25, 2023

What is the Synonym of $property for Embedded Python?

#InterSystems IRIS #Embedded Python #ObjectScript #Python

Hi folks!

I have a need to use symilar to $property function from Python. Here is the code:

obj=iris.cls('some.persistent.class')._New()

for property, value in data.items():

 $property(obj.property)=value ; I invented this

How could I do this? Any trick?

For now I plan to implement a helper function in iris that I will call, but I doubt also how can I transfer oref to IRIS.

Thoughts?

Discussion (5)2
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Comments

Alex Woodhead · Jun 25, 2023

Hi Evgeny,

Not saying this is best way but this indirection can be achieved with python eval. For example:

$Classmethod equivalent

classname="%SYSTEM.SYS"
methodname="ProcessID"
eval(f"iris.cls(\"{classname}\").{methodname}()")

$Property equivalent

Instantiating a Python exception and then iterate over properties printing out name and value:

myerror=iris.cls("%Exception.PythonException")._New("MyOops",123,"def+123^XYZ","SomeData")

for propertyname in ["Name","Code","Data","Location"]:
    propvalue=eval(f"myerror.{propertyname}")

    print(f"Property Name {propertyname} has value {propvalue}\n")

output was:

Property Name Name has value MyOops
 
Property Name Code has value 123
 
Property Name Data has value SomeData
 
Property Name Location has value def+123^XYZ
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Dmitry Maslennikov · Jun 26, 2023

Another solution is to use getattr

classname="%SYSTEM.SYS"
methodname="ProcessID"
pid = getattr(iris.cls(classname), 'ProcessID')()

myerror=iris.cls("%Exception.PythonException")._New("MyOops",123,"def+123^XYZ","SomeData")
for propertyname in ["Name","Code","Data","Location"]:
    print(getattr(myerror, propertyname))
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Gertjan Klein  Jun 26, 2023 to Dmitry Maslennikov

And for completeness: setting a property with a name not known until runtime can be done with the counterpart of getattr, setattr:

USER>do ##class(%SYS.Python).Shell()

Python 3.10.6 (main, Mar 10 2023, 10:55:28) [GCC 11.3.0] on linux
Type quit() or Ctrl-D to exit this shell.
>>> e=iris.cls("%Exception.PythonException")._New("MyOops",123,"def+123^XYZ","SomeData")
>>> e.Name
'MyOops'
>>> setattr(e,'Name','TheirOops')
>>> e.Name
'TheirOops'

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