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copied!<p>I can't reproduce this myself, but I have an idea of what's happening -- I'm just not sure <em>how</em> it's happening. Hopefully someone can chime in. Note that <code>file</code> isn't passed through to handleDownload, and <code>file</code> is also the name of a builtin type. If <code>file</code> were left as the builtin, then you'd get exactly this error:</p> <pre><code>>>> file <type 'file'> >>> file.write("3") Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: descriptor 'write' requires a 'file' object but received a 'str' </code></pre> <p>So I think some of the problem is a confusion between <code>file</code>, the built-in, and <code>file</code>, the opened file itself. (Probably using a name other than <code>"file"</code> is a good idea here.) Anyway, if you simply use</p> <pre><code>ftp.retrbinary('RETR ' + filename, file.write) </code></pre> <p>and ignore the <code>handleDownload</code> function entirely, it should work. Alternatively, if you wanted to keep the dots printing every block, you could be a little fancier, and write something like</p> <pre><code>def handleDownloadMaker(openfile): def handleDownload(block): openfile.write(block) print ".", return handleDownload </code></pre> <p>which is a function which <em>returns</em> a function that points at the right file. After that,</p> <pre><code>ftp.retrbinary('RETR' + filename, handleDownloadMaker(file)) </code></pre> <p>should work too.</p>

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