Pytao crashes when bmad lattice throws an error

[vhranjbar]

When I set a quad strength to a bad setting Pytao crashes:
python test2.py
Traceback (most recent call last):
File "/Users/vahidranjbar/Develop/RCS/RCS_2/RCS_DougH/May2024Lat/test2.py", line 17, in
error = tao.cmd("set element QF0 K1=.6")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/vahidranjbar/miniconda3/lib/python3.11/site-packages/pytao/tao_ctypes/core.py", line 146, in cmd
raise RuntimeError(f"Command: {cmd} causes error: {err}")
RuntimeError: Command: set element QF0 K1=.6 causes error: ERROR detected: [ERROR | 2024-JUL-05 21:19:25] closed_orbit_calc:
PARTICLE LOST IN TRACKING!!
ABORTING CLOSED ORBIT SEARCH.
TRACKING BRANCH: 0:RING

This is the python script:

from pytao import Tao
import numpy
import sys
import time
import math
import subprocess
import os

from subprocess import Popen, PIPE

load_lattice ='-lat rcsl4s1-wig_henry.bmad -noplot'
tao=Tao(load_lattice)
#names = tao.ele_gen_attribs('k1')
#print(names[0:105])

#gammaT =float(names[42].split()[1]))
error = tao.cmd("set element QF0 K1=.6")
names = tao.cmd("show universe")
print(error)
print(names)

[ken-lauer]

You can still get the error output of the command by using:

 error = tao.cmd("set element QF0 K1=.6", raises=False)

There's not currently a good way of filtering out specific error messages or ignoring them entirely. Errors and warnings unfortunately come directly from Tao in the same data stream as the output information from each command.