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Using an Object Instance as an FTP Callback

class Writer:     def __init__(self, file):         self.f = open(file, "w")     def __call__(self, data):         self.f.write(data)         self.f.write('\n')         print data FILENAME = "AutoIndent.py" writer = Writer(FILENAME) import ftplib ftp = ftplib.FTP('127.0.0.1', 'book', 'bookpw') ftp.retrlines("RETR %s" % FILENAME, writer)