[Python.NET] Could you tell me how to call python from c#?
Michael Eddington
meddington at gmail.com
Wed Jun 6 20:08:48 CEST 2007
Yes, you can set the PYTHONHOME variable from .net prior to calling
the initialize. Many of the python runtimes set registry keys or are
located in default locations.
mike
On 6/6/07, Barrett, Joey <Joey.Barrett at itg.com> wrote:
>
> Thank you for your response, this is helpful.
>
> The methods called usually return lists or dictionaries and sometimes
> other types too that need to be used within the C#. In the example you
> provided the return value from InvokeMethod(), is a string "fromPython",
> but I noticed InvokeMethod() actually returns a PyObject.
>
> How can I look at that PyObject and extract the returned values?
>
> The classes I use import many modules from a number of locations on disk
> that aren't known to the interpreter.
>
> Is there a way to add to the PYTHONPATH programmatically in C# using the
> Python for .net library, or would it be required to write a wrapper
> python module that adds to the path first? Maybe there is another way
> to handle this?
>
> Thank you again
>
> Joey J. Barrett
> Investment Technology Group, Inc.
>
> -----Original Message-----
> From: Karpenstein, Nissim (C-BASS)
> [mailto:Nissim.Karpenstein at C-BASS.COM]
> Sent: Wednesday, June 06, 2007 6:37 AM
> To: Barrett, Joey; pythondotnet at python.org
> Subject: RE: [Python.NET] Could you tell me how to call python from c#?
>
> I tried to post this to the list yesterday but it bounced because of
> address issues...hopefully this will work:
>
> If you want to execute a python program from c-sharp you can just use
> System.Diagnostics.Process to execute python.exe and you don't need
> python for .net.
>
> Python for .net is more appropriate for if you want to execute a python
> function or create an instance of a python object and then run methods
> and access attributes from your C# program.
>
> The example you linked to is OK, except that he modified the
> Python.Runtime.Dll which is not necessary.
>
> If you had a Hello.py with a function called hello Like this:
>
> def hello():
> return 'hello'
>
>
> You could do this in C#:
>
> PythonEngine.Initialize();
> PyObject helloModule = PythonEngine.ImportModule("Hello");
> String fromPython = helloModule.InvokeMethod("hello", new
> PyTuple()).ToString(); PythonEngine.Shutdown();
>
> // now fromPython = "hello"
>
> If your function takes an argument:
>
> def returnArg(arg):
> return arg
>
> PythonEngine.Initialize();
> PyObject helloModule = PythonEngine.ImportModule("Hello");
> String fromPython = helloModule.InvokeMethod("returnArg", new
> PyObject[1] {new PyString("Test")}).ToString(); PythonEngine.Shutdown();
>
> // now fromPython = "test"
>
> ________________________________
>
> From: pythondotnet-bounces at python.org
> [mailto:pythondotnet-bounces at python.org] On Behalf Of Barrett, Joey
> Sent: Tuesday, June 05, 2007 8:11 PM
> To: pythondotnet at python.org
> Subject: Re: [Python.NET] Could you tell me how to call python
> from c#?
>
>
>
> Hi,
>
>
>
> I also would be very interested in seeing some examples to "call
> python from c#" using "Python for .NET". I have dug around Google and a
> number of forums---I can't find anything except the post from below. I
> really hope I'm not missing the obvious somewhere.
>
>
>
> IronPython is great but my needs require using a few c++
> extensions compiled for CPython (that can't be recompiled).
>
>
>
> Also thanks in advance,
>
>
>
> Joey J. Barrett
>
> Investment Technology Group, Inc.
>
>
>
>
>
>
>
>
>
> Hello, PythonNet!
>
>
> I'm looking for some sample code to call python from C#.
> Actually, I'd like to execute python program(let say 'Hello.py')
> from C#
> with parameters.
> Actually, I'm a newbie at both of languages. So, could you give
> sample
> source code? I was looking for some guide or source for several
> days,
> but I couldn't find it. What I've got so far from googling is
>
> http://mail.python.org/pipermail/pythondotnet/2003-November/000037.html,
>
> but I can't understand it and old one.
>
> Thank you in advance.
> Seungweon.
>
>
>
>
>
>
> -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> -+-
> This message is for the named person's use only. This
> communication is for
> informational purposes only and has been obtained from sources
> believed to
> be reliable, but it is not necessarily complete and its accuracy
> cannot be
> guaranteed. It is not intended as an offer or solicitation for
> the purchase
> or sale of any financial instrument or as an official
> confirmation of any
> transaction. Moreover, this material should not be construed to
> contain any
> recommendation regarding, or opinion concerning, any security.
> It may
> contain confidential, proprietary or legally privileged
> information. No
> confidentiality or privilege is waived or lost by any
> mistransmission. If
> you receive this message in error, please immediately delete it
> and all
> copies of it from your system, destroy any hard copies of it and
> notify the
> sender. You must not, directly or indirectly, use, disclose,
> distribute,
> print, or copy any part of this message if you are not the
> intended
> recipient. Any views expressed in this message are those of the
> individual
> sender, except where the message states otherwise and the sender
> is
> authorized to state them to be the views of any such entity.
>
> Securities products and services provided to Canadian investors
> are offered
> by ITG Canada Corp. (member CIPF and IDA), an affiliate of
> Investment
> Technology Group, Inc.
>
> ITG Inc. and/or its affiliates reserves the right to monitor and
> archive
> all electronic communications through its network.
>
> ITG Inc. Member NASD, SIPC
>
> -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> -+-
>
>
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>
> This e-mail (including any attachments) may contain
> information that is private, confidential, or
> protected by attorney-client or other privilege. If
> you received this e-mail in error, please delete it
> from your system without copying it and notify sender
> by reply e-mail, so that our records can be corrected.
> -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> This message is for the named person's use only. This communication is for
> informational purposes only and has been obtained from sources believed to
> be reliable, but it is not necessarily complete and its accuracy cannot be
> guaranteed. It is not intended as an offer or solicitation for the purchase
> or sale of any financial instrument or as an official confirmation of any
> transaction. Moreover, this material should not be construed to contain any
> recommendation regarding, or opinion concerning, any security. It may
> contain confidential, proprietary or legally privileged information. No
> confidentiality or privilege is waived or lost by any mistransmission. If
> you receive this message in error, please immediately delete it and all
> copies of it from your system, destroy any hard copies of it and notify the
> sender. You must not, directly or indirectly, use, disclose, distribute,
> print, or copy any part of this message if you are not the intended
> recipient. Any views expressed in this message are those of the individual
> sender, except where the message states otherwise and the sender is
> authorized to state them to be the views of any such entity.
>
> Securities products and services provided to Canadian investors are offered
> by ITG Canada Corp. (member CIPF and IDA), an affiliate of Investment
> Technology Group, Inc.
>
> ITG Inc. and/or its affiliates reserves the right to monitor and archive
> all electronic communications through its network.
>
> ITG Inc. Member NASD, SIPC
> -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> _________________________________________________
> Python.NET mailing list - PythonDotNet at python.org
> http://mail.python.org/mailman/listinfo/pythondotnet
>
More information about the PythonDotNet
mailing list