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Re: [ESPResSo-users] Python Interface

From: Axel Arnold
Subject: Re: [ESPResSo-users] Python Interface
Date: Tue, 2 Jun 2015 20:32:23 +0200


Pierre is correct, ESPResSo is not Python3-compatible. The error you see comes 
from the fact that string constants in Python3 are Unicode, which Tcl_eval 
doesn't eat. There should be a b before the string to make it a byte string, 
but a short grep for print makes me doubt the rest of the code is python3...

Would be good if the build process refuses python3...


> Am 02.06.2015 um 19:23 schrieb Pierre de Buyl <address@hidden>:
> Is espresso compatible with Python 3 (just asking but the submitter has 
> "Python
> 3.4.3").
> Pierre
>> On Tue, Jun 02, 2015 at 07:06:40PM +0200, Kai Szuttor wrote:
>> I just pulled from the master on git and checked compilation. I had a
>> problem building the current master and found a missing
>> field in a struct defined in the python interface, so i was not able to
>> build. In my current master this bug is fixed and im able to build.
>> Maybe your build was erroneous. So just clone from my repo and try:
>> Cheers
>> Kai Szuttor
>>> On 06/02/2015 02:53 PM, address@hidden wrote:
>>> The details are attached. I'm running an ArchLinux 64-bit system with 
>>> espresso compiled from the git source. With ./configure --with-python
>>> The program compiles correctly however, on running ./pypresso and trying to 
>>> import espressomd;
>>> Python 3.4.3 (default, Mar 25 2015, 17:13:50) 
>>> [GCC 4.9.2 20150304 (prerelease)] on linux
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>> import espressomd
>>> Traceback (most recent call last):
>>>  File "<stdin>", line 1, in <module>
>>>  File "/home/haozeke/Github/LabBom/espresso/espressomd/", line 
>>> 32, in <module>
>>>    tcl = espressomd._tcl.TclInterpreter()
>>>  File "espressomd/_tcl.pyx", line 37, in 
>>> espressomd._tcl.TclInterpreter.__init__ (_tcl.cpp:654)
>>>    self.eval('global argv; set argv ""')
>>>  File "espressomd/_tcl.pyx", line 43, in 
>>> espressomd._tcl.TclInterpreter.eval (_tcl.cpp:745)
>>>    result = Tcl_Eval(self.interp, string)
>>> TypeError: expected bytes, str found
>>> Any help would be greatly appreciated.

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