Python FTP 客户端：文件传输协议实现综合指南

            python -c "import ftplib; print(ftplib.__doc__)"
            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"  # Replace with the FTP server address
ftp_user   = "your_username"   # Replace with your FTP username
ftp_pass   = "your_password"   # Replace with your FTP password

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)
    print(ftp.getwelcome())

except ftplib.all_errors as e:
    print(f"FTP error: {e}")
    exit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    files = ftp.nlst()
    for file in files:
        print(file)

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()  # Disconnect from the server

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    ftp.dir()

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib
import io

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    buffer = io.StringIO()
    ftp.dir(output=buffer.write)
    directory_listing = buffer.getvalue()
    print(directory_listing)

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    ftp.cwd("/path/to/directory")  # Replace with the desired directory
    files = ftp.nlst()
    for file in files:
        print(file)

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

filename = "file.txt"  # Replace with the name of the file to download
local_filename = "downloaded_file.txt" # Replace with the desired local filename

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    with open(local_filename, "wb") as f:
        ftp.retrbinary(f"RETR {filename}", f.write)

    print(f"File '{filename}' downloaded successfully to '{local_filename}'.")

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

filename = "local_file.txt"  # Replace with the name of the local file to upload
remote_filename = "uploaded_file.txt"  # Replace with the desired filename on the server

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    with open(filename, "rb") as f:
        ftp.storbinary(f"STOR {remote_filename}", f)

    print(f"File '{filename}' uploaded successfully to '{remote_filename}'.")

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)
    ftp.set_pasv(True)  # Enable passive mode

    files = ftp.nlst()
    for file in files:
        print(file)

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib
import ssl

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP_TLS(ftp_server)
    ftp.ssl_version = ssl.PROTOCOL_TLS  # Specify the TLS protocol version
    ftp.login(ftp_user, ftp_pass)
    ftp.prot_p()

    files = ftp.nlst()
    for file in files:
        print(file)

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

filename = "large_file.dat"  # Replace with the name of the file to download
local_filename = "downloaded_file.dat"
buffer_size = 8192  # 8KB buffer size

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    with open(local_filename, "wb") as f:
        ftp.retrbinary(f"RETR {filename}", f.write, blocksize=buffer_size)

    print(f"File '{filename}' downloaded successfully to '{local_filename}'.")

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib
import os

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

filename = "large_file.dat"  # Replace with the name of the file to download
local_filename = "downloaded_file.dat"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    # Check if the local file already exists
    if os.path.exists(local_filename):
        local_file_size = os.path.getsize(local_filename)
        ftp.retrbinary(f"RETR {filename}", open(local_filename, "ab").write, rest=local_file_size)
        print(f"Resumed download of '{filename}' from byte {local_file_size}.")
    else:
        with open(local_filename, "wb") as f:
            ftp.retrbinary(f"RETR {filename}", f.write)
        print(f"Started download of '{filename}'.")

    print(f"File '{filename}' downloaded successfully to '{local_filename}'.")

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)

    try:
        ftp.cwd("/nonexistent/directory")
    except ftplib.error_perm as e:
        print(f"Error changing directory: {e}")

    files = ftp.nlst()
    for file in files:
        print(file)

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy
              
            
          

            import ftplib
import socket

ftp_server = "invalid.example.com"  # Replace with an invalid hostname

try:
    ftp = ftplib.FTP(ftp_server)
    # ... rest of the code ...

except socket.gaierror as e:
    print(f"Socket error: {e}")
except ftplib.all_errors as e:
    print(f"FTP error: {e}")

# ...

            

              
                Copy
              
            
          

            import ftplib
import os
import datetime

ftp_server = "ftp.example.com"
ftp_user   = "your_username"
ftp_pass   = "your_password"
remote_dir  = "/path/to/backup/directory"  # Replace with the remote directory to backup
local_backup_dir = "/path/to/local/backup"   # Replace with the local backup directory

# Create the backup directory if it doesn't exist
if not os.path.exists(local_backup_dir):
    os.makedirs(local_backup_dir)

# Create a timestamped subdirectory for the backup
timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
backup_subdir = os.path.join(local_backup_dir, timestamp)
os.makedirs(backup_subdir)

try:
    ftp = ftplib.FTP(ftp_server)
    ftp.login(ftp_user, ftp_pass)
    ftp.cwd(remote_dir)

    files = ftp.nlst()

    for file in files:
        local_filename = os.path.join(backup_subdir, file)
        with open(local_filename, "wb") as f:
            ftp.retrbinary(f"RETR {file}", f.write)
        print(f"Downloaded '{file}' to '{local_filename}'.")

    print(f"Backup completed successfully to '{backup_subdir}'.")

except ftplib.all_errors as e:
    print(f"FTP error: {e}")

finally:
    ftp.quit()

            

              
                Copy