pymol crashing under Qt on Catalina

[Jack Howarth]

      The +python37 variant of pymol runs fine under its Qt interface on
Catalina, however the stock +python27 variant crashes Qt as follows...

Process:               Python [46230]
Path:
 /opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Identifier:            Python
Version:               2.7.16 (2.7.16)
Code Type:             X86-64 (Native)
Parent Process:        zsh [907]
Responsible:           Terminal [342]
User ID:               501

Date/Time:             2019-10-13 08:42:10.315 -0400
OS Version:            Mac OS X 10.15 (19A583)
Report Version:        12
Anonymous UUID:        4A09CC71-7509-3F2D-8C77-BB546FDAFB8D

Sleep/Wake UUID:       A3189974-D375-47A3-B65F-45F7E7DE5271

Time Awake Since Boot: 16000 seconds
Time Since Wake:       12000 seconds

System Integrity Protection: disabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0xffffffffffffffff
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [46230]

The entire crash report is attached. Any idea what is going on here as it
seems to be specific to python2.7?
          Jack
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