python code to copy file to remote server using sftp, with 5x retry

syncfile.py

import subprocess
import warnings
# Suppress the deprecation warning from the cryptography module.
with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    import cryptography
import sys
import pysftp
import paramiko
import os
import logging
import sys
import time
def setup_custom_logger(name):
    formatter = logging.Formatter(fmt='%(asctime)s %(levelname)-8s %(message)s',
                                  datefmt='%Y-%m-%d %H:%M:%S')
    handler = logging.FileHandler('log.txt', mode='w')
    handler.setFormatter(formatter)
    screen_handler = logging.StreamHandler(stream=sys.stdout)
    screen_handler.setFormatter(formatter)
    logger = logging.getLogger(name)
    logger.setLevel(logging.DEBUG)
    logger.addHandler(handler)
    logger.addHandler(screen_handler)
    return logger

l = setup_custom_logger('filesync')
for loopcount in range(5):
    try:
        ssh_client = paramiko.SSHClient()
        ssh_client.load_system_host_keys()
        ssh_client.connect(hostname="x.y.a.b",username="user",password="pass")
        sftp = ssh_client.open_sftp()
        thedir = sys.argv[1]
        srcfile = sys.argv[2]
        destfile = sys.argv[3]
        filestat_src = os.stat(srcfile)
    #    thedir = "TEST"+thedir
        fullfile = thedir+"/"+destfile
    #    print("thedir="+thedir+";srcfile="+srcfile+";destfile="+destfile)
        try:
            filestat=sftp.stat(thedir)
            destPathExists = True
        except Exception as e:
            destPathExists = False
        if destPathExists == False:
            sftp.mkdir(thedir)
        try:
            filestat1=sftp.stat(fullfile)
            destFileExists = True
        except Exception as e:
            destFileExists = False
        doCopy = True
        if destFileExists:
            l.info( "file "+fullfile+" exists with size " + str(filestat1.st_size) + "( source size = " + str(filestat_src.st_size) +")")
            if filestat1.st_size != filestat_src.st_size:
                l.error("size mismatch, resending")
            else:
                doCopy = False
                break        
        if doCopy:
            l.info("copying "+srcfile + " to " + fullfile)
            try:
                sftp.chdir(thedir)
                sftp.put(srcfile,destfile)
                l.info("completed")
            except Exception as e:
                l.error("error occured")
                continue
        sftp.close()
        ssh_client.close()
    except Exception as e1:
        l.error("error occurred")
        time.sleep(5)