#!/usr/bin/env python3
import subprocess
def rsync():
    subprocess.run(['rsync', '-ahv', '/path1/', '/path2/'])
print('Start')
rsync()
print('Finish')

 import subprocess
# start the subprocess
process = subprocess.Popen(['ls', '-l'])
# wait for the subprocess to complete
process.wait()
# continue with the rest of your program
print("Subprocess completed.")

 import subprocess
# start the subprocess
process = subprocess.Popen(['ls', '-l'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
# wait for the subprocess to complete and collect its output
output, error = process.communicate()
# print the output and any errors
print(output)
print(error)

 #!/usr/bin/env python3
import subprocess
def rsync():
    proc = subprocess.Popen(['rsync', '-ahv', '/path1/', '/path2/'])
    proc.wait()
print('Start')
rsync()
print('Finish')

Start
...
syncthing/
syncthing/cert.pem
syncthing/config.xml
syncthing/csrftokens.txt
syncthing/https-cert.pem
syncthing/https-key.pem
syncthing/key.pem
Finish
syncthing/index-v0.14.0.db/
syncthing/index-v0.14.0.db/000040.ldb
syncthing/index-v0.14.0.db/000041.log
syncthing/index-v0.14.0.db/000043.ldb
syncthing/index-v0.14.0.db/CURRENT
syncthing/index-v0.14.0.db/CURRENT.bak
syncthing/index-v0.14.0.db/LOCK
syncthing/index-v0.14.0.db/LOG
syncthing/index-v0.14.0.db/MANIFEST-000042
...

 import subprocess
def rsync():
    proc = subprocess.Popen(["ping", "-c", "4", "8.8.8.8"])
    proc.wait()
print("Start")
rsync()
print("Finish")