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Take a look at the BRNDT2 function in the API. For example:

ierr, line_rx = psspy.brndt2(113987,113973,'1','RX')

would give you a complex value for the line impedance. linerx.real and linerx.imag will then separate the resistance and reactance values of the impedance.

Take a look at the BRNDT2 function in the API. For example:

ierr, line_rx = psspy.brndt2(113987,113973,'1','RX')

would give you a complex value for the line impedance. linerx.real and linerx.imag will then separate the resistance and reactance values of the impedance.

rx = None
sav = 'c:/path/to/your/case.sav'
from_bus = '113987'
to_bus = '113973'
ckt = ' 1'

case = caspy.Savecase(sav)
# Look for from bus in FRMBUS list
for i in range(len(case.pssbrn.frmbus)):        
    if ((case.pssbrn.frmbus[i] == float(from_bus)) and (case.pssbrn.tobus[i]==float(to_bus)) and case.pssbrn.ckt[i].strip() == ckt_id.strip()):
        rx = case.pssbrn.rx[i]
# Look for from bus in TOBUS list
for i in range(len(case.pssbrn.tobus)):       
    if ((case.pssbrn.frmbus[i] == float(to_bus)) and (case.pssbrn.tobus[i]==float(from_bus)) and case.pssbrn.ckt[i].strip() == ckt_id.strip()):
        rx = case.pssbrn.rx[i]

if rx:
    print('%05f + %05fi' % (rx.real,rx.imag))
else:
    print('Branch not found in case')

Take a look at the BRNDT2 function in the API. For example:

ierr, line_rx = psspy.brndt2(113987,113973,'1','RX')

would give you a complex value for the line impedance. linerx.real and linerx.imag will then separate the resistance and reactance values of the impedance.

You were also interested in accessing the data from caspy. It is quite a bit different beast, and is a little more difficult to get the data you are requesting.

Here is the gist of how to get the same data:

rx = None
sav = 'c:/path/to/your/case.sav'
from_bus = '113987'
to_bus = '113973'
ckt ckt_id = ' 1'

case = caspy.Savecase(sav)
# Look for from bus in FRMBUS list
for i in range(len(case.pssbrn.frmbus)):        
    if ((case.pssbrn.frmbus[i] == float(from_bus)) and (case.pssbrn.tobus[i]==float(to_bus)) and case.pssbrn.ckt[i].strip() == ckt_id.strip()):
        rx = case.pssbrn.rx[i]
# Look for from bus in TOBUS list
for i in range(len(case.pssbrn.tobus)):       
    if ((case.pssbrn.frmbus[i] == float(to_bus)) and (case.pssbrn.tobus[i]==float(from_bus)) and case.pssbrn.ckt[i].strip() == ckt_id.strip()):
        rx = case.pssbrn.rx[i]

if rx:
    print('%05f + %05fi' % (rx.real,rx.imag))
else:
    print('Branch not found in case')