Getting all the branches in an area by just the area number?

63 ●3 ●5 ●11

Yes, there is. Define a subsystem from the area(s) and use the subsystem data retrieval APIs. Something like the untested code below. This could potentially be cleaned up a bunch, but similar code has worked well enough for me in the past.

MySubsystem = 1 ## Arbitrary subsystem number, 0 through 11 are allowed I think?
MyAreas = [1,2,3,4]
ierr = psspy.bsysinit(MySubsystem)
ierr = psspy.bsysadd(MySubsystem, numarea=len(MyAreas), areas=MyAreas)

ierr, ckts = psspy.abrnchar(sid=MySubsystem, string='ID')
ierr, FromNum = psspy.abrnint(sid=MySubsystem, string='FROMNUMBER')
ierr, ToNum = psspy.abrnint(sid=MySubsystem, string='TONUMBER')

## PSSE returns a "list of lists" for each of the subsystem data retrieval functions
## We need to pull out the first element of each to make it easier to work with:
ckts = ckts[0]
FromNum = FromNum[0]
ToNum = ToNum[0]

BranchList = []
for i in range(len(ckts)):
    BranchList.append([ckts[i], FromNum[i], ToNum[i]])

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Comments

Yeah, sth like that I think. Though I seem to remember that the abrn functions sometimes return the second element ("chts", "FromNum", "ToNum") as a list inside a list. Either them or some other subsystem retrival functions do that.