Python downloads data from ftp to save the instance

The weather data of the hadoop authoritative guide can be found in

Copy codeThe Code is as follows:
#! /Usr/bin/python
#-*-Coding: UTF-8 -*-

From ftplib import FTP

Def ftpconnect ():
Ftp_server = 'ftp3 .ncdc.noaa.gov'
Username =''
Password =''
Ftp = FTP ()
Ftp. set_debuglevel (2) # enable debug level 2 and display details
Ftp. connect (ftp_server, 21) # connect
Ftp. login (username, password) # log on. If you log on anonymously, use an empty string instead.
Return ftp

Def downloadfile ():
Ftp = ftpconnect ()
# Print ftp. getwelcome () # display ftp server welcome information
Datapath = "/pub/data/noaa /"
Year = 1911
While year <= 1930:
Path = datapath + str (year)
Li = ftp. nlst (path)
For eachFile in li:
Localpaths = eachFile. split ("/")
Localpath = localpaths [len (localpaths)-1]
Localpath = 'weatherdata/'+ str (year) +' -- '+ localpath # Place the date at the beginning to facilitate sorting
Bufsize = 1024 # Set the buffer block size
Fp = open (localpath, 'wb ') # open a file locally in write mode
Ftp. retrbinary ('RETR' + eachFile, fp. write, bufsize) # receives files from the server and writes them to local files.
Year = year + 1
Ftp. set_debuglevel (0) # disable debugging
Fp. close ()
Ftp. quit () # exit the ftp server

If _ name __= = "_ main __":
Downloadfile ()