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Keyword arguments from UV to Python?

1. Keyword arguments from UV to Python?

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Nic Davidson
Posted 12-29-2020 17:47

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Good afternoon,

I am wondering if the ability to send keyword arguments into PyCallFunction/PyCallMethod is something being added into a future version of UV? Does anyone have any insight as to when something like this might be added?

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Nic Davidson
Combined Transport
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2. RE: Keyword arguments from UV to Python?

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John Jenkins
Posted 01-04-2021 07:45

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Nic,

Do you have any examples of the functionality you were seeking?

Regards

JJ

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John Jenkins
Principal Technical Support Engineer
Rocket Software Limited
U.K.
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3. RE: Keyword arguments from UV to Python?

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Jonathan Smith
Posted 01-04-2021 08:42

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As JJ stated some examples of what you are looking for would help.

In the latest releases of UniData RUNPY has been enhanced so that command line arguments can now be passed and the u2py.command.run() has been enhanced to allow the returning of a result string.

Regards,

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Jonathan Smith
UniData ATS and Principal Engineer
Rocket Software
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4. RE: Keyword arguments from UV to Python?

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Nic Davidson
Posted 01-04-2021 11:42

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Apologize for not being more specific, here is an example from what I am working on now. Building an email program that pulls attachments from the filesystem, or report data from UV and sends to specified recipients.

I am currently doing something like this which works for one very specific application:

(From UV Basic)

TO = "bill@bill.com"
CC = "bob@bill.com"
SUBJECT = "Subject"
MSG.BODY = "this is the message body"
ATTACHMENT = "/home/bob/attachment.txt"

SENT = PyCallFunction("python_email_module","python_email_func", TO, CC, SUBJECT, MSG.BODY, ATTACHMENT, "", "")

def python_email_func(to_addr, cc_addrs, subject, msg_body, attachment, bcc, html):
     ### Do stuff and send the email

     return success_code

Which is functional, but what if I want to send an email with a BCC and without a CC? or without an attachment? Currently I have to run the PyCallFunction with empty strings or Nulls in order to get it to work.

SENT = PyCallFunction("python_email_module","python_email_func", TO, "", SUBJECT, MSG.BODY, ATTACHMENT, "", "")

This makes the function more cumbersome than it needs to be. ("was Attachment path the 5th or 6th positional argument?") This also makes it really difficult to go back and add functionality later.

Normally in Python land, I could rework my function like the following:

def python_email_func(to_addr, subject, body, *args, **kwargs):
     cc_addrs = kwargs.pop("CC", None)
     html = kwargs.pop("html", False)
     attachment_paths = kwargs.pop("ATTACHMENT", None)

     ### Do stuff and send the email

     return success_code

Then from Basic I could do something like:

SENT = PyCallFunction("python_email_module","python_email_func", TO, SUBJECT, MSG.BODY, cc_addrs = CC, attachment_path = ATTACHMENT)

I could then call the same function and do something very different:

SENT = PyCallFunction("python_email_module","python_email_func", TO, SUBJECT, MSG.BODY, bcc_addrs = BCC, HTML=True, IMPORTANCE=URGENT)

Keywords would be useful in other contexts as well, this is just the example I have in front of me right now.

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Nic Davidson
Combined Transport
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5. RE: Keyword arguments from UV to Python?

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Mike Rajkowski
Posted 01-08-2021 16:20

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Note that only strings/numbers and Python objects can be passed as an argument with the API. That being said, there are ways to do what you describe, but it is more of your original example, and not Keyword Arguments. In you last post you mentioned a function with the following signiture: def python_email_func(to_addr, subject, body, *args, **kwargs): The **kwargs is expecting a Python Dictionary

# mike.py: import ast def myfunc( a=1, b=2 ): print(a, b) def myfunc2( args ): myfunc( **args ) def myfunc3( pdstr ): parsed = ast.literal_eval(pdstr.rstrip()) myfunc( **parsed )

Calling the first function with no parameters uses the default

myfunc()

1 2

For myfunc2 we can pass in a python dictionaty

myargs = { 'a': 11 } myfunc2(myargs)

11 2

And the myfunc3 takes the string reprsentation of the Python dictionar

myargs = "{ 'a': 123, 'b': 456 }" myfunc3(myargs)

123 456

The basic Program KWTEST:

ModuleName = "mike" FuncName = "myfunc" PRINT "CALL WITH NO PARAMETERS" *call the Python function pyresult = PyCallFunction(ModuleName, FuncName) * MName = "builtins" ClsName = "dict" PRINT "Create the python dict object" pymodule = PyImport(MName) pydictcls = PyGetAttr(pymodule, ClsName) pydict = PyCall(pydictcls) pyresult = PyCallMethod(pydict, "__setitem__", "a", 11) FuncName = "myfunc2" pyresult = PyCallFunction(ModuleName, FuncName, pydict) * PRINT "send a string representation of the Python dict" args = "{ 'b': 123, 'a': 456 }" FuncName = "myfunc3" pyresult = PyCallFunction(ModuleName, FuncName, args)

When you run it you get:

:RUN PBP KWTEST CALL WITH NO PARAMETERS 1 2 Create the python dict object 11 2 send a string representation of the Python dict 456 123

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Michael Rajkowski
Rocket Software
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Original Message

Rocket U2 | UniVerse & UniData

Keyword arguments from UV to Python?

Nic Davidson12-29-2020 17:47

John Jenkins01-04-2021 07:45

Jonathan Smith01-04-2021 08:42

Nic Davidson01-04-2021 11:42

Mike Rajkowski01-08-2021 16:20

1. Keyword arguments from UV to Python?

2. RE: Keyword arguments from UV to Python?

3. RE: Keyword arguments from UV to Python?

4. RE: Keyword arguments from UV to Python?

5. RE: Keyword arguments from UV to Python?

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