python - Python 中的 FTP_ASCII

Question

我正在尝试构建一个小型 FTPClient 作为我的宠物项目，并且已经走到了这一步。

from ftplib import FTP

class FTPClient():

    connection_id = None
    login_ok = False
    message_array = []

    def __init__(self):
        pass

    def log_message(self, message, clear=True):
        if clear:
            self.message_array = message

    def get_message(self):
        return self.message_array

    def connect(self, server, ftp_user, ftp_password, is_passive = False):
        self.connection_id = FTP.connect(server)
        login_result = FTP.login(self.connection_id, ftp_user, ftp_password)
        FTP.set_pasv(self.connection_id, is_passive)

        if not self.connection_id or not login_result:
            self.log_message("FTP Connection has Failed")
            self.log_message("Attempted to connect to {0} for {1}".format(server, ftp_user))
            return False
        else:
            self.log_message("Connected to {0} for {1}".format(server, ftp_user))
            self.login_ok = True
            return True

    def make_dir(self, directory):
        if FTP.mkd(self.connection_id, directory):
            self.log_message("Directory {0} created successfully".format(directory))
            return True
        else:
            self.log_message("Failed creating directory")
            return False


    def upload_file(self, file_from, file_to):
        ascii_array = ['txt','csv']
        extension = file_from.split(".")[-1]
        if extension in ascii_array:
            mode = # FTP_ASCII
        else:
            mode = # FTP_BINARY

我目前正在测试扩展名是否出现在应作为 ascii 类型上传的文件扩展名列表中。如果它出现在列表中，我们将变量模式设置为 ASCII；否则，我们假设它是二进制类型，并为模式分配值 BINARY。

我怎样才能做到这一点？

Answer 1

使用storelines对于 ASCII 传输模式，storebinary用于二进制传输模式。

def upload_file(self, file_from, file_to):
    if file_from.lower().endswith(('.txt', '.csv')):
        with open(file_from, 'r') as f:
            self.connection_id.storelines('STOR {}'.format(file_to), f)
    else:
        with open(file_from, 'rb') as f:
            self.connection_id.storebinary('STOR {}'.format(file_to), f)

旁注:您可以使用 str.endswith检查文件扩展名:

>>> 'a.csv'.endswith(('.txt', '.csv'))
True
>>> 'a.txt'.endswith(('.txt', '.csv'))
True
>>> 'a.bin'.endswith(('.txt', '.csv'))
False

---

顺便说一句，为什么要使用未绑定(bind)的方法 (FTP.login(self.connection_id, ...))而不是绑定(bind)方法 (self.connection_id.login(...)) ?

>>> s = "STRING"
>>> str.lower(s) # unbound method
'string'
>>> s.lower()    # bound method
'string'