import ftplib
import os
import socket

HOST='ftp.ensemblgenomes.org'
DIRN='pub/release-22/plants/fasta/'

def main():
        try:
                f=ftplib.FTP(HOST)
        except ftplib.error_perm:
                print('Can not contect"%s" '%HOST)
                return
        print('Connect "%s" successfully!'%HOST)

        try:
                f.login('anonymous','1')
        except ftplib.error_perm:
                print("Fail to login in !")
                f.quit()
                return
        print("Login successfully!")

        try:
                f.cwd(DIRN)
        except ftplib.error_perm:
                print('Fail to list!')
                f.quit()
                return
        #print(f.nlst())
        dowloadlist=f.nlst()
        for FILE in dowloadlist:
                try:
                        f.cwd(FILE+"/"+"pep")
    
                except ftplib.error_perm:
                        print('Fail to visit folder!')
                        #f.quit()
                        #return
                print(f.nlst())

                for item in f.nlst():
                        if 'pep.all.fa.gz' in item and os.path.exists(item) is False:
                                f.retrbinary('RETR %s' % item,open(item,'wb').write)
                                print('file"%s"is dowloaded successfully!' % item)
               
                f.cwd("..")
                f.cwd("..")
                                               
if __name__ == '__main__':
        main()

print('ok')