使用python下载NCDC数据

#!/usr/bin/python# -*- coding: utf-8 -*-import osfrom ftplib import FTP# ftp 服务器链接def ftpconnect():    ftp_server = 'ftp.ncdc.noaa.gov'    username = ''    password = ''    ftp = FTP()    ftp.set_debuglevel(2)  # 打开调试级别2，显示详细信息    ftp.connect(ftp_server, 21)  # 连接    ftp.login(username, password)  # 登录，如果匿名登录则用空串代替即可    return ftp# 开始下载文件def downloadfile(start, end,srcpath):    ftp = ftpconnect()    # print ftp.getwelcome() #显示ftp服务器欢迎信息    datapath = "/pub/data/gsod/"    while start <= end:        path = datapath + str(start)        li = ftp.nlst(path)        # 创建指定年份的目录        path = srcpath + '/'        dir = str(start)        new_path = os.path.join(path, dir)        if not os.path.isdir(new_path):            os.makedirs(new_path)        for eachFile in li:            localpaths = eachFile.split("/")            localpath = localpaths[len(localpaths) - 1]            localpath = new_path + '/' + str(start) + '--' + localpath  # 把日期放在最前面，方便排序            bufsize = 1024  # 设置缓冲块大小            fp = open(localpath, 'wb')  # 以写模式在本地打开文件            ftp.retrbinary('RETR ' + eachFile, fp.write, bufsize)  # 接收服务器上文件并写入本地文件        start = start + 1    ftp.set_debuglevel(0)  # 关闭调试    ftp.close()    ftp.quit()  # 退出ftp服务器if __name__ == "__main__":    downloadfile(1950,2017,"g:/c/ncdc")