Develop Reference

Converting Intersystems cache objectscript into a python function

I am accessing an Intersystems cache 2017.1.xx instance through a python process to get various attributes about the database in able to monitor the database.
One of the items I want to monitor is license usage. I wrote a objectscript script in a Terminal window to access license usage by user:
s Rset=##class(%ResultSet).%New("%SYSTEM.License.UserListAll")
s r=Rset.Execute()
s ncol=Rset.GetColumnCount()
While (Rset.Next()) {f i=1:1:ncol w !,Rset.GetData(i)}
But, I have been unable to determine how to convert this script into a Python equivalent. I am using the intersys.pythonbind3 import for connecting and accessing the cache instance. I have been able to create python functions that accessing most everything else in the instance but this one piece of data I can not figure out how to translate it to Python (3.7).

Following should work (based on the documentation):
query = intersys.pythonbind.query(database)
query.prepare_class("%SYSTEM.License","UserListAll")
query.execute();
# Fetch each row in the result set, and print the
# name and value of each column in a row:
while 1:
cols = query.fetch([None])
if len(cols) == 0: break
print str(cols[0])
Also, notice that InterSystems IRIS -- successor to the Caché now has Python as an embedded language. See more in the docs

Since the noted query "UserListAll" is not defined correctly in the library; not SqlProc. So to resolve this issue would require a ObjectScript with the query and the use of #Result set or similar in Python to get the results. So I am marking this as resolved.

Not sure which Python interface you're using for Cache/IRIS, but this Open Source 3rd party one is worth investigating for the kind of things you're trying to do:
https://github.com/chrisemunt/mg_python

bingads V13 report request fails in python sdk

I try to download a bingads report using python SDK, but I keep getting an error says: "Type not found: 'Aggregation'" after submitting a report request. I've tried all 4 options mentioned in the following link:
https://github.com/BingAds/BingAds-Python-SDK/blob/master/examples/v13/report_requests.py
Authentication process prior to request works just fine.
I execute the following:
report_request = get_report_request(authorization_data.account_id)
reporting_download_parameters = ReportingDownloadParameters(
report_request=report_request,
result_file_directory=FILE_DIRECTORY,
result_file_name=RESULT_FILE_NAME,
overwrite_result_file=True, # Set this value true if you want to overwrite the same file.
timeout_in_milliseconds=TIMEOUT_IN_MILLISECONDS
)
output_status_message("-----\nAwaiting download_report...")
download_report(reporting_download_parameters)
after a careful debugging, it seems that the program fails when trying to execute a command within "reporting_service_manager.py". Here is workflow:
download_report(self, download_parameters):
report_file_path = self.download_file(download_parameters)
then:
download_file(self, download_parameters):
operation = self.submit_download(download_parameters.report_request)
then:
submit_download(self, report_request):
self.normalize_request(report_request)
response = self.service_client.SubmitGenerateReport(report_request)
SubmitGenerateReport starts a sequence of events ending with a call to "_SeviceCall.init" function within "service_client.py", returning an exception "Type not found: 'Aggregation'"
try:
response = self.service_client.soap_client.service.__getattr__(self.name)(*args, **kwargs)
return response
except Exception as ex:
if need_to_refresh_token is False \
and self.service_client.refresh_oauth_tokens_automatically \
and self.service_client._is_expired_token_exception(ex):
need_to_refresh_token = True
else:
raise ex
Can anyone shed some light? .
Thanks

Please be sure to set Aggregation e.g., as shown here.
aggregation = 'Daily'
If the report type does not use aggregation, you can set Aggregation=None.
Does this help?

This may be a bit late 2 months after the fact but maybe this will help someone else. I had the same error (though I suppose it may not be the same issue). It does look like you did what I did (and I'm sure others will as well): copy-paste the Microsoft example code and tried to run it only to find that it didn't work.
I spent quite some time trying to debug the issue and it looked to me like the XML wasn't being searched correctly. I was using suds-py3 for the script at the time so I tried suds-community and everything just worked after that.
I also re-read the Bing Ads API walkthrough for getting started again and found that they recommend suds-jurko instead.
Long story short: If you want to use the bingads API don't use suds-py3, use either suds-community (which I can confirm works for everything I've used the API for) or suds-jurko (which is the one recommended by Microsoft).

Get menu entries of GDBusMenuModel with PyGObject

So because I have the unity-gtk-module installed, all gtk-applications export their menu over the dbus SessionBus. My goal is to extract a list of all available menu entries. I've already implemented this with the help of pydbus, but for some reason, this solution is highly unstable and some applications just flat out crash. The unity-gtk-module uses Gio's g_dbus_connection_export_menu_model () to export its GMenuModel modeled menu over dbus, so I thought it would make sense to try to use Gio to process the exported menu. Gio uses the GDBusMenuModel class to retrieve a menu from the bus. Python uses PyGObject for wrapping Gio:
from gi.repository import Gio
connection = Gio.bus_get_sync(Gio.BusType.SESSION, None)
menuModel = Gio.DBusMenuModel.get(connection, [bus-name e.g. ":1.5"], [object-path e.g. "/com/canonical/unity/gtk/window/0"])
Now menuModel should be wrapping the GMenuModel from my application. At this point I'm honestly a bit confused about how exactly the GMenuModel works (the Description is not really helping) but it seems I have to use a GMenuAttributeIter object to iterate through the entries. But when I try this:
iter = Gio.MenuModel.iterate_item_attributes(menuModel, 0) #0 is the index of the root node
this happens:
GLib-GIO-CRITICAL **: g_dbus_menu_model_get_item_attributes: assertion 'proxy->items' failed
GLib-GIO-CRITICAL **: GMenuModel implementation 'GDBusMenuModel' doesn't override iterate_item_attributes() and fails to return sane calues from get_item_attributes()
This probably happens because GDBusMenuModel inherits GMenuModel which provides these methods, but is abstract, so GDBusMenuModel should override them, which it doesn't (see link above, it provides just g_dbus_menu_model_get ()). If this is the case, how am I supposed to actually use this class as a proxy? And if it's not, what am I doing wrong?

I justed logged in to SO the first time after a few years and remembered that I've actually found a solution to this question (I think). Honestly, I can't remember what half of these words even mean, but at the time I wrote a script to accomplish the task posed in the title, and as far as I remember, in the end, it worked out: https://gist.github.com/encomiastical/caa0ee955300bc2a40ef55d123b06212

Heavily confused by win32api + COM and an answer from SO

From my other question here on SO, I asked how to retrieve the current playing song from Windows Media Player and Zune, I got an answer from a c++ dev who gave me an explanation of how I would do this for WMP.
However, I am no C++ dev, nor am I very experienced with the pywin32 library. And on-top of all that, the documentation on all this (especially concerning WMP) is horrible.
Therefor, I need your help understanding how I would do the following in Python.
Source
I have working code in C++ to print the name of media currently
playing in WMP. It's a simple console application (78 lines of code).
Steps:
1) implements a basic COM object implementing IUnknown, IOleClientSite, IServiceProvider and IWMPRemoteMediaServices. This is
straightforward (sort of, your mileage may vary) using the ATL
template CComObjectRootEx. The only methods needing (simple) code are
IServiceProvider::QueryService and
IWMPRemoteMediaServices::GetServiceType. All other methods may return
E_NOTIMPL
2) Instantiate the "WMPlayer.OCX" COM object (in my case, via CoCreateInstance)
3) Retrieve from the object an IOleObject interface pointer via QueryInterface
4) Instanciate an object from the class seen in 1) (I use the CComObject<>::CreateInstance template)
5) Use the SetClientSite method from the interface you got at 3), passing a pointer to your OleClientSite implementation.
6) During the SetClientSite call, WMP will callback you: fisrt asking for an IServiceProvider interface pointer, second calling the
QueryService method, asking for an IWMPRemoteMediaServices interface
pointer. Return your implementation of IWMPRemoteMediaServices and,
third, you will be called again via GetServiceType. You must then
return "Remote". You are now connected to the WMP running instance
7) Query the COM object for an IWMPMedia interface pointer
8) If 7) didn't gave NULL, read the the IWMPMedia::name property.
9) DONE
All the above was tested with VS2010 / Windows Seven, and with WMP
running (if there is no Media Player process running, just do
nothing).
I don't know if yoy can/want to implement COM interface and object in
Python. If you are interested by my C++ code, let me know. You could
use that code in a C++ DLL, and then call it from python.
I know a little bit about the win32api.
At the first step, I really don't know what to do, googling IOleClientSite results in the msdn documentation, it's an interface. However, that's where I get stuck already. I can't find anything (might just be my horrendous googling skills) on working with these things in Python.
The second step:
WMP = win32com.client.Dispatch("WMPlayer.OCX")
Alright, that's doable.
On to the third step. QueryInterface -
"regardless of the object you have, you can always call its QueryInterface() method to obtain a new interface, such as IStream."
source
However, not for me. As I understand his explanation, I think it means that every com object sort of "inherits" three methods from IUnknown, one of which is QueryInterface, however this does not seem the case since calling QueryInterface on my WMP object fails miserably. (Object has no attribute 'QueryInterface')
I could ramble on, but I believe you got the point, I have no idea how to work with this. Can anyone help me out with this one? Preferably with code examples, but resources/documentation is welcome too.

Almost final answser but CAN'T finish.
I seems that pythoncom can't be used to implement custom Interface without the help of a C++ module.
Here is an answser from Mark Hammon (Mon, 13 Jan 2003): How to create COM Servers with IID_IDTExtensibility2 interface
Sorry - you are SOL. To support arbitary interfaces, you need C++
support, in the form of an extension module. There is a new "Univgw"
that may help you out, but I dont know much about this
I am not able to find anything about that "Univgw" thing...
The comtypes python module is intended to resolve the problem, and I found links saying it does, but I can't make it works with my fresh new Python 3.3. It's Python 2.x code. comtypes seems outdated and unmaintained.
Step 1 OK for IOleClientSite and IServiceProvider, KO for IWMPRemoteMediaServices
Step 2, 3, 4 and 5 OK
Step 6, 7 and 8 can't be implemented without IWMPRemoteMediaServices :-(
disclaimer: complete newbie in Python, please don't yell
import pythoncom
import win32com.client as wc
from win32com.axcontrol import axcontrol
import win32com.server as ws
from win32com.server import util
from win32com.server.exception import COMException
import winerror
import pywintypes
# Windows Media Player Custom Interface IWMPRemoteMediaServices
IWMPRemoteMediaServices = pywintypes.IID("{CBB92747-741F-44FE-AB5B-F1A48F3B2A59}")
class OleClientSite:
_public_methods_ = [ 'SaveObject', 'GetMoniker', 'GetContainer', 'ShowObject', 'OnShowWindow', 'RequestNewObjectLayout', 'QueryService' ]
_com_interfaces_ = [ axcontrol.IID_IOleClientSite, pythoncom.IID_IServiceProvider ]
def SaveObject(self):
print("SaveObject")
raise COMException(hresult=winerror.E_NOTIMPL)
def GetMoniker(self, dwAssign, dwWhichMoniker):
print("GetMoniker ")
raise COMException(hresult=winerror.E_NOTIMPL)
def GetContainer(self):
print("GetContainer")
raise COMException(hresult=winerror.E_NOTIMPL)
def ShowObject(self):
print("ShowObject")
raise COMException(hresult=winerror.E_NOTIMPL)
def OnShowWindow(self, fShow):
print("ShowObject" + str(fShow))
raise COMException(hresult=winerror.E_NOTIMPL)
def RequestNewObjectLayout(self):
print("RequestNewObjectLayout")
raise COMException(hresult=winerror.E_NOTIMPL)
def QueryService(self, guidService, riid):
print("QueryService",guidService,riid)
if riid == IWMPRemoteMediaServices:
print("Known Requested IID, but can't implement!")
raise COMException(hresult=winerror.E_NOINTERFACE)
else:
print("Requested IID is not IWMPRemoteMediaServices" )
raise COMException(hresult=winerror.E_NOINTERFACE)
if __name__=='__main__':
wmp = wc.Dispatch("WMPlayer.OCX")
IOO = wmp._oleobj_.QueryInterface(axcontrol.IID_IOleObject)
pyOCS = OleClientSite()
comOCS = ws.util.wrap(pyOCS, axcontrol.IID_IOleClientSite)
IOO.SetClientSite(comOCS)

Mule 3.4 - scripting in Python

I'm having quite a bit of trouble getting started with scripting in Mule. To be quite honest, I'm falling at the first hurdle - I can't find anything in the documentation which tells me how to access the payload or how to return data to my flow.
I'm using Jython 2.5 and Mule 3.4.
My flow is extremely simple: it takes some text from an Ajax source and simply echoes it. At the moment the Python script does nothing (as I cannot figure out how to get it to do something with the payload).
<flow name="Python Script" doc:name="Python Script">
<ajax:connector name="connector-ajax" serverUrl="http://192.168.0.1:8000" resourceBase="C:\mule\workspace\scripting\src\main\app\docroot" doc:name="Ajax" />
<scripting:component doc:name="Python">
<scripting:script engine="jython" file="C:\mule\workspace\scripting\src\main\app\python\myscript.py"/>
</scripting:component>
<echo-component doc:name="Echo"/>
</flow>
I have read through the Script Component Reference and the Scripting Module Reference - the module reference appears to have some relevant information but I can't figure out how to use it in Python.
I have also read through an article about 'Mule Punching' which seems like it would have answered my question if I was running version 2 of Mule. I attempted to use the same techniques in my Mule 3 project but it did not work.
Edit 24/07/2012
Using #ppiixx's response, I have got a little bit further with Python scripting.
Just having a single line of code, for example return len(payload) causes the Jython interpreter to throw an error as return cannot exist outside of a function. Fair enough, that's standard.
However, with the code
def main():
return len(payload)
main()
I get an error saying that 'No serializer can be found for class org.mule.transport.NullPayload'.
The log is below:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Started app 'python-test' +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2013-07-24 09:16:08,821 [[python-test].flow.stage1.02] org.mule.component.simple.LogComponent:
********************************************************************************
* Message received in service: flow. Content is: '{NullPayload}' *
********************************************************************************
ERROR 2013-07-24 09:16:08,849 [[python-test].flow.stage1.02] org.mule.exception.CatchMessagingExceptionStrategy:
********************************************************************************
Message : No serializer found for class org.mule.transport.NullPayload and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (org.codehaus.jackson.map.JsonMappingException)
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. No serializer found for class org.mule.transport.NullPayload and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (org.codehaus.jackson.map.JsonMappingException)
org.codehaus.jackson.map.ser.impl.UnknownSerializer:52 (null)
2. No serializer found for class org.mule.transport.NullPayload and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (org.codehaus.jackson.map.JsonMappingException) (org.mule.api.transformer.TransformerException)
org.mule.module.json.transformers.ObjectToJson:107 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transformer/TransformerException.html)
This leads me to think that using return on its own isn't enough to return data to the flow.
I've read through the scripting module reference, and while it gives examples in Groovy, it does not give examples in Python so I'm not sure where I'm going wrong.

Have a look at the 'Script Context Bindings' section here.
Basically a number of variables are available in the script context including: message,payload and log.
To return data using the python engine you set the result variable.
result = len(payload)
There is a example in the mule github.