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In general names should be python compatible containing only A-Z,a-z,0-9,_. An exception is that ENUMDICT and ENUMVAL have special handling that requires a ":". And I think if not alias is specified for epics variables then the ugly epics name is used. This is handled correctly by psana for this special case, but it makes it difficult to enforce naming rules. Also, in the case of step-scans I think the epics variables have no python-compatible alias. This also makes it difficult to enforce naming rules. Attributes (e.g. attr1, attr2 in evt._dgrams[nDgram].detname[nSegment].drpClassName.attr1.attr2...) are created by adding "." in the names.
The one "fatal" case I have seen is if an epics name has a "." in it which is interpreted as an attribute delimiter. This gives rise to this error:
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(ps-4.1.3) psanagpu102:~$ detnames exp=tmoc00118,run=232
Traceback (most recent call last):
File "/cds/home/c/cpo/git/lcls2/install/bin/detnames", line 11, in <module>
load_entry_point('psana', 'console_scripts', 'detnames')()
File "/cds/home/c/cpo/git/lcls2/psana/psana/app/detnames.py", line 71, in detnames
names = myrun.detinfo.keys()
File "/cds/home/c/cpo/git/lcls2/psana/psana/psexp/run.py", line 159, in detinfo
info[(detname,det_xface_name)] = _enumerate_attrs(getattr(self.Detector(detname),det_xface_name))
File "/cds/home/c/cpo/git/lcls2/psana/psana/psexp/run.py", line 118, in Detector
setattr(det,drp_class_name,drp_class(det_name, drp_class_name, self.dsparms.configinfo_dict[det_name], self.dsparms.calibconst[det_name], env_store, var_name))
File "/cds/home/c/cpo/git/lcls2/psana/psana/detector/misc_detectors.py", line 23, in __init__
values = getattr(names,n).split('\n')
AttributeError: 'container.Container' object has no attribute 'split'
(ps-4.1.3) psanagpu102:~$
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