import sys, os, time, _thread as thread
from socket import *

blksz = 1024
defaultHost = 'localhost'
defaultPort = 50001

helptext = """
Usage...
server=> getfile.py -mode server [-port nnn] [-host hhh|localhost]
client=> getfile.py [-mode client] -file fff [-port nnn] [-host hhh|localhost]
"""

def now():
return time.asctime()

def parsecommandline():
dict = {} # put in dictionary for easy lookup
args = sys.argv[1:] # skip program name at front of args
while len(args) >= 2: # example: dict['-mode'] = 'server'
dict[args[0]] = args[1]
args = args[2:]
return dict

def client(host, port, filename):
sock = socket(AF_INET, SOCK_STREAM)
sock.connect((host, port))
sock.send((filename + '\n').encode()) # send remote name with dir: bytes
dropdir = os.path.split(filename)[1] # filename at end of dir path
file = open(dropdir, 'wb') # create local file in cwd
while True:
data = sock.recv(blksz) # get up to 1K at a time
if not data: break # till closed on server side
file.write(data) # store data in local file
sock.close()
file.close()
print('Client got', filename, 'at', now())

def serverthread(clientsock):
sockfile = clientsock.makefile('r') # wrap socket in dup file obj
filename = sockfile.readline()[:-1] # get filename up to end-line
try:
file = open(filename, 'rb')
while True:
bytes = file.read(blksz) # read/send 1K at a time
if not bytes: break # until file totally sent
sent = clientsock.send(bytes)
assert sent == len(bytes)
except:
print('Error downloading file on server:', filename)
clientsock.close()

def server(host, port):
serversock = socket(AF_INET, SOCK_STREAM) # listen on TCP/IP socket
serversock.bind((host, port)) # serve clients in threads
serversock.listen(5)
while True:
clientsock, clientaddr = serversock.accept()
print('Server connected by', clientaddr, 'at', now())
thread.start_new_thread(serverthread, (clientsock,))

def main(args):
host = args.get('-host', defaultHost) # use args or defaults
port = int(args.get('-port', defaultPort)) # is a string in argv
if args.get('-mode') == 'server': # None if no -mode: client
if host == 'localhost': host = '' # else fails remotely
server(host, port)
elif args.get('-file'): # client mode needs -file
client(host, port, args['-file'])
else:
print(helptext)

if name == 'main':
args = parsecommandline()
main(args)

文件下载客户端：gui

import sys, os
from tkinter import *
from tkinter.messagebox import showinfo

def onReturnKey():
cmdline = ('python getfile.py -mode client -file %s -port %s -host %s' %
(content['File'].get(),
content['Port'].get(),
content['Server'].get()))
os.system(cmdline)
showinfo('getfilegui-1', 'Download complete')

box = Tk()
labels = ['Server', 'Port', 'File']
content = {}
for label in labels:
row = Frame(box)
row.pack(fill=X)
Label(row, text=label, width=6).pack(side=LEFT)
entry = Entry(row)
entry.pack(side=RIGHT, expand=YES, fill=X)
content[label] = entry

box.title('getfilegui-1')
box.bind('<Return>', (lambda event: onReturnKey()))
mainloop()

----------------------------------------------------------------------或者
import getfile
from tkinter import *
from tkinter.messagebox import showinfo

def onSubmit():
getfile.client(content['Server'].get(),
int(content['Port'].get()),
content['File'].get())
showinfo('getfilegui-2', 'Download complete')

box = Tk()
labels = ['Server', 'Port', 'File']
rownum = 0
content = {}
for label in labels:
Label(box, text=label).grid(column=0, row=rownum)
entry = Entry(box)
entry.grid(column=1, row=rownum, sticky=E+W)
content[label] = entry
rownum += 1

box.columnconfigure(0, weight=0) # make expandable
box.columnconfigure(1, weight=1)
Button(text='Submit', command=onSubmit).grid(row=rownum, column=0, columnspan=2)

box.title('getfilegui-2')
box.bind('<Return>', (lambda event: onSubmit()))
mainloop()