Error when run 'pg = grace()' on Windows

[KylinGuo]

Here are the details.

(pymatgen_env) C:\Users\USER>ipython
Python 3.11.2 | packaged by Anaconda, Inc. | (main, Mar 27 2023, 23:35:04) [MSC v.1916 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.12.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: from pygrace import grace

In [2]: pg = grace()
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[2], line 1
----> 1 pg = grace()

File C:\ProgramData\Anaconda3\envs\pymatgen_env\Lib\site-packages\pygrace\__init__.py:58, in grace(*args, **kwds)
     56 def grace(*args, **kwds):
     57     from pygrace import interactive
---> 58     return interactive.session(*args, **kwds)

File C:\ProgramData\Anaconda3\envs\pymatgen_env\Lib\site-packages\pygrace\interactive\__init__.py:18, in grace(*args, **kwds)
     16 def grace(*args, **kwds):
     17     from .session import grace as graceFactory
---> 18     return graceFactory(*args, **kwds)

File C:\ProgramData\Anaconda3\envs\pymatgen_env\Lib\site-packages\pygrace\interactive\session.py:46, in grace.__init__(self, *args, **kwds)
     44 def __init__(self, *args, **kwds):
     45     from .project import Project
---> 46     self.session = Project(*args, **kwds)
     47     self.whos = {}
     48     self.reserved = ['and','assert','break','class','continue','def','del',
     49                      'elif','else','except','exec','finally','for','from',
     50                      'global','if','import','in','is','lambda','not','or',
     51                      'pass','print','raise','return','try','while','yield',
     52                      'as','None']

File C:\ProgramData\Anaconda3\envs\pymatgen_env\Lib\site-packages\pygrace\interactive\project.py:73, in Project.__init__(self, *args, **kwds)
     72 def __init__(self, *args, **kwds):
---> 73     self.grace = process.Process(*args, **kwds)
     74     self.g = [ Graph(self.grace, 0) ]
     75     self.curr_graph = self.g[0]

File C:\ProgramData\Anaconda3\envs\pymatgen_env\Lib\site-packages\pygrace\interactive\process.py:83, in Process.__init__(self, bufsize, debug, fixedsize, ask, safe, batch, project)
     80         com = com + ('-batch', self.batch)
     82 # Don't exit when xmgrace exits (e.g. user clicks `exit')
---> 83 signal.signal(signal.SIGCHLD, signal.SIG_IGN)
     85 # Create a numbered pipe used for communication to xmgrace
     86 (fd_r, fd_w) = os.pipe()

AttributeError: module 'signal' has no attribute 'SIGCHLD'

[KylinGuo]

This problem is encountered on Windows 11 and I am using the latest conda (version: 23.5.0). It works well on Ubuntu 22.04.

[mmckerns]

Apparently there's no SIGCHLD on Windows. https://stackoverflow.com/questions/9217401/sigchld-replacement-for-windows