写一份PythonFTP案例，代码超过80行

好的，以下是一个稍微复杂一些的 Python FTP 案例，代码超过80行：

import ftplib
import os

# FTP服务器的地址、用户名、密码
ftp_host = "ftp.example.com"
ftp_username = "username"
ftp_password = "password"

# 本地文件路径和FTP服务器上的路径
local_path = "/path/to/local/files"
ftp_path = "/path/to/ftp/files"

# 连接FTP服务器
ftp = ftplib.FTP(ftp_host)
ftp.login(ftp_username, ftp_password)

# 列出FTP服务器上的文件
ftp.cwd(ftp_path)
files = ftp.nlst()
print(f"FTP服务器 {ftp_host}:{ftp_path} 上的文件列表：")
for file in files:
    print(file)

# 上传本地文件到FTP服务器
def ftp_upload_file(local_file_path, ftp_file_path):
    filename = os.path.basename(local_file_path)
    with open(local_file_path, "rb") as f:
        ftp.storbinary(f"STOR {ftp_file_path}/{filename}", f)

# 上传整个文件夹到FTP服务器
def ftp_upload_folder(local_folder_path, ftp_folder_path):
    for root, dirs, files in os.walk(local_folder_path):
        for file in files:
            local_file_path = os.path.join(root, file)
            ftp_file_path = os.path.join(ftp_folder_path, os.path.relpath(local_file_path, local_folder_path))
            ftp_upload_file(local_file_path, ftp_file_path)

# 下载FTP服务器上的文件到本地
def ftp_download_file(ftp_file_path, local_file_path):
    with open(local_file_path, "wb") as f:
        ftp.retrbinary(f"RETR {ftp_file_path}", f.write)

# 下载FTP服务器上的整个文件夹到本地
def ftp_download_folder(ftp_folder_path, local_folder_path):
    os.makedirs(local_folder_path, exist_ok=True)
    ftp.cwd(ftp_folder_path)
    files = ftp.nlst()
    for file in files:
        ftp_file_path = os.path.join(ftp_folder_path, file)
        local_file_path = os.path.join(local_folder_path, file)
        if ftp.nlst(ftp_file_path):
            ftp_download_folder(ftp_file_path, local_file_path)
        else:
            ftp_download_file(ftp_file_path, local_file_path)

# 删除FTP服务器上的文件或文件夹
def ftp_delete(ftp_path):
    try:
        ftp.cwd(ftp_path)
        files = ftp.nlst()
        for file in files:
            ftp_delete(os.path.join(ftp_path, file))
        ftp.cwd("..")
        ftp.rmd(ftp_path)
    except ftplib.all_errors:
        ftp.delete(ftp_path)

# 执行上传、下载、删除操作
if __name__ == "__main__":
    # 上传本地文件
    local_file_path = os.path.join(local_path, "example.txt")
    ftp_file_path = os.path.join(ftp_path, "example.txt")
    ftp_upload_file(local_file_path, ftp_file_path)

    # 上传整个文件夹
    local_folder_path = os.path.join(local_path, "subfolder")
    ftp_folder_path = os.path.join(ftp_path, "subfolder")
    ftp_upload_folder(local_folder_path, ftp_folder_path)

    # 下载FTP服务器上的文件
    ftp_file_path = os.path.join(ftp_path, "example.txt")
    local_file_path = os.path.join(local_path, "example_downloaded.txt")
    ftp_download_file(ftp_file_path, local_file_path)

    # 下载FTP服务器上的整个文件夹
    ftp_folder_path = os.path.join(ftp_path, "subfolder")
    local_folder_path = os.path.join(local_path, "subfolder_downloaded")
    ftp_download_folder(ftp_folder_path, local_folder_path)

    # 删除FTP服务器上的文件和文件夹
    ftp_delete(ftp_file_path)
    ftp_delete(ftp_folder_path)

# 关闭FTP连接
ftp.quit()

这个案例演示了如何连接到一个 FTP 服务器，列出服务器上的文件列表，上传文件和文件夹到服务器，从服务器下载文件和文件夹，删除服务器上的文件和文件夹，以及关闭 FTP 连接。注意，这个案例中的用户名、密码、FTP 服务器地址、本地文件路径和FTP服务器上的路径都是假的，请根据实际情况修改。