Ctcsound import error

General
#1

Hi,
After updating ctcsound (I need to do it manually due to my Anaconda configuration), I found that importing ctcsound results in error.
I tried ctcsound from csound-MacOS_x86_64-6.16.2.dmg and Csound source repository, but both cannot be imported. The error message is attached below.
Is there any conflict with Python version?

MacBook Pro(Intel)
MacOS 11.6.1(BigSur)
Csound v6.16.2(installed from dmg)
Python 3.8.11
JupyterLab3.2.1

Importing ctcsound from Csound 6.16.2 installer

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/var/folders/08/p6f034s48xjbh80059bry1jr0000gn/T/ipykernel_5697/205267035.py in <module>
----> 1 import ctcsound

~/.pyenv/versions/anaconda3-2019.10/envs/dev38/lib/python3.8/site-packages/ctcsound.py in <module>
   2703     sys.exit("Don't know your system! Exiting...")
   2704 
-> 2705 libcspt.NewCsoundPT.restype = ct.c_void_p
   2706 libcspt.NewCsoundPT.argtypes = [ct.c_void_p]
   2707 libcspt.DeleteCsoundPT.argtypes = [ct.c_void_p]

~/.pyenv/versions/anaconda3-2019.10/envs/dev38/lib/python3.8/ctypes/__init__.py in __getattr__(self, name)
    384         if name.startswith('__') and name.endswith('__'):
    385             raise AttributeError(name)
--> 386         func = self.__getitem__(name)
    387         setattr(self, name, func)
    388         return func

~/.pyenv/versions/anaconda3-2019.10/envs/dev38/lib/python3.8/ctypes/__init__.py in __getitem__(self, name_or_ordinal)
    389 
    390     def __getitem__(self, name_or_ordinal):
--> 391         func = self._FuncPtr((name_or_ordinal, self))
    392         if not isinstance(name_or_ordinal, int):
    393             func.__name__ = name_or_ordinal

AttributeError: dlsym(RTLD_DEFAULT, NewCsoundPT): symbol not found

Importing ctcsound from Csound source repository

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/var/folders/08/p6f034s48xjbh80059bry1jr0000gn/T/ipykernel_5758/205267035.py in <module>
----> 1 import ctcsound

~/.pyenv/versions/anaconda3-2019.10/envs/dev38/lib/python3.8/site-packages/ctcsound.py in <module>
    421 libcsound.csoundCreateThread.restype = ct.c_void_p
    422 libcsound.csoundCreateThread.argtypes = [THREADFUNC, ct.py_object]
--> 423 libcsound.csoundCreateThread2.restype = ct.c_void_p
    424 libcsound.csoundCreateThread2.argtypes = [THREADFUNC, ct.c_uint, ct.py_object]
    425 libcsound.csoundGetCurrentThreadId.restype = ct.c_void_p

~/.pyenv/versions/anaconda3-2019.10/envs/dev38/lib/python3.8/ctypes/__init__.py in __getattr__(self, name)
    384         if name.startswith('__') and name.endswith('__'):
    385             raise AttributeError(name)
--> 386         func = self.__getitem__(name)
    387         setattr(self, name, func)
    388         return func

~/.pyenv/versions/anaconda3-2019.10/envs/dev38/lib/python3.8/ctypes/__init__.py in __getitem__(self, name_or_ordinal)
    389 
    390     def __getitem__(self, name_or_ordinal):
--> 391         func = self._FuncPtr((name_or_ordinal, self))
    392         if not isinstance(name_or_ordinal, int):
    393             func.__name__ = name_or_ordinal

AttributeError: dlsym(0x7fcc4f787270, csoundCreateThread2): symbol not found
#2

I think I have solved the issue.
Changing the line 2700 of ctcsound.py (provided by csound-MacOS_x86_64-6.16.2.dmg)
from

elif sys.platform.startswith('darwin'):
    libcspt = ct.CDLL(ctypes.util.find_library('csnd6'))

to

elif sys.platform.startswith('darwin'):
    libcspt = ct.CDLL(ctypes.util.find_library('csnd6.6.0'))

seems to solve the issue.