Python subprocess capture output of bash code in parentheses - python-3.x

Question

I have a shell script that I run in a subprocess.popen() and would like to capture the output of that script and send it line by line into a logger object. The issue is that the output from the subprocess is captured by the parentheses (), and I never see the output. Has anyone here ever seen this happen, and would you be able to guide me on how to best do this?
The code takes a backup on a remote server and stores it locally. The parentheses are needed to encapsulate the ssh-agent in case more than one are open at the same time.
The bash code
( \
eval $(ssh-agent) > /dev/null; \
ssh-add -q /home/borgs/.ssh/borg-client_key; \
echo $borgPassword | \
ssh -p ${port} -A -o StrictHostKeyChecking=no ${user}#${ipAddress} \
"BORG_PASSPHRASE=\$(cat) \
borg \
--rsh 'ssh -p 9270 -o StrictHostKeyChecking=no' \
create \
--verbose \
--filter AME \
--list \
--stats \
--show-rc \
--compression lz4 \
--exclude-caches \
ssh://borgs#${ip_address}/~/${hostname}::$hostname-$backupTime $locations";
kill "${SSH_AGENT_PID}"; \
) >&1
The python code
def takeBackup(server, lg):
print(f"Taking backup of {server['hostname']}")
locationString = " ".join(server['locations'])
print(
"Running create-backup.sh command: create-backup.sh",
f"{server['hostname']} {server['ip-address']} '{locationString}'"
)
process = subprocess.Popen(
[
"./create-backup.sh",
server['hostname'],
server['ip-address'],
server['borgPassword'],
locationString
],
stdin=subprocess.PIPE,
stderr=subprocess.PIPE,
stdout=subprocess.PIPE
)
for line in process.stdout:
line = line.decode().rstrip('\n')
lg.print_info(line)
process.wait()
print(process.returncode)