AttributeError: 'RealDouble' object has no attribute 'real_part'

[drsaroj]

When I am running the example mackey_glass.py, I am getting the error

Traceback (most recent call last):
  File "mackey_glass.py", line 73, in <module>
    DDE.step_on_discontinuities()
  File "/Users/sarojkumar/Library/Python/3.7/lib/python/site-packages/jitcdde/_jitcdde.py", line 904, in step_on_discontinuities
    for delay in self.delays
  File "/Users/sarojkumar/Library/Python/3.7/lib/python/site-packages/jitcdde/_jitcdde.py", line 904, in <listcomp>
    for delay in self.delays
AttributeError: 'RealDouble' object has no attribute 'real_part'

I have gone through a similar problem where you have listed a solution to use

pip3 install symengine==0.3.1.dev1 --force-reinstall

which again shows the following error

Found existing installation: symengine 0.4.0
    Uninstalling symengine-0.4.0:
      Successfully uninstalled symengine-0.4.0
  Running setup.py install for symengine ... error
    ERROR: Complete output from command /Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/py/fk3c24856kn0b81dvlf3mwl80000gn/T/pip-install-azaxqukr/symengine/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/py/fk3c24856kn0b81dvlf3mwl80000gn/T/pip-record-g6dym_ro/install-record.txt --single-version-externally-managed --compile:
    ERROR: running install
    running build
    running build_ext
    error: [Errno 2] No such file or directory: 'cmake': 'cmake'
    ----------------------------------------
  Rolling back uninstall of symengine
  Moving to /Users/sarojkumar/Library/Python/3.7/lib/python/site-packages/symengine-0.4.0.dist-info/
   from /Users/sarojkumar/Library/Python/3.7/lib/python/site-packages/~ymengine-0.4.0.dist-info
  Moving to /Users/sarojkumar/Library/Python/3.7/lib/python/site-packages/symengine/
   from /Users/sarojkumar/Library/Python/3.7/lib/python/site-packages/~ymengine
ERROR: Command "/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/py/fk3c24856kn0b81dvlf3mwl80000gn/T/pip-install-azaxqukr/symengine/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/py/fk3c24856kn0b81dvlf3mwl80000gn/T/pip-record-g6dym_ro/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/py/fk3c24856kn0b81dvlf3mwl80000gn/T/pip-install-azaxqukr/symengine/

I am using Python 3.7.3 in Mac OSX 10.13.6 with Clang 6.0 (clang-600.0.57.

[Wrzlprmft]

Your problem is that you lack CMake, which is required to build the old version of SymEngine. You can probably solve this by installing CMake. Alternatively, you can install JiTC*DE fresh from the Git repository, where this was already fixed:

pip3 install \
        git+git://github.com/neurophysik/jitcxde_common \
        git+git://github.com/neurophysik/jitcode \
        git+git://github.com/neurophysik/jitcdde \
        git+git://github.com/neurophysik/jitcsde \
        --no-dependencies --user

It appears that I have to make a new release to deal with this issue.

[drsaroj]

Thank you for your support, Now it is working fine. The only warning that appears is from running the file two_Roesslers.py which is following

---

two_Roesslers.py:27: FutureWarning: arrays to stack must be passed as a "sequence" type such as list or tuple. Support for non-sequence iterables such as generators is deprecated as of NumPy 1.16 and will raise an error in the future. data = np.vstack(DDE.integrate(T) for T in times)

---

Thank you once again.