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POhow to write utf-8 string to utf-8 file on utf-8 machine with python
 

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  1. POhow to write utf-8 string to utf-8 file on utf-8 machine with python
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    <p>Not the first time, by this confused me:</p> <p>Open the file with <code>codecs.open</code>:</p> <pre><code>cfh = codecs.open('/tmp/ddfh', 'wb', 'utf-8') </code></pre> <p>Try to write the string, sa:</p> <pre><code>In [109]: sa Out[109]: '\xe6\x96\xb0 \xe9\x97\xbb\xe3\x80\x80\xe7\xbd\x91 \xe9\xa1\xb5\xe3\x80\x80\xe8\xb4\xb4 \xe5\x90\xa7\xe3\x80\x80\xe7\x9f\xa5 \xe9\x81\x93\xe3\x80\x80\xe9\x9f\xb3 \xe4\xb9\x90\xe3\x80\x80\xe5\x9b\xbe \xe7\x89\x87\xe3\x80\x80\xe8\xa7\x86 \xe9\xa2\x91\xe3\x80\x80\xe5\x9c\xb0 \xe5\x9b\xbe' In [110]: print sa 新 闻　网 页　贴 吧　知 道　音 乐　图 片　视 频　地 图 In [111]: sa.encode() --------------------------------------------------------------------------- UnicodeDecodeError Traceback (most recent call last) /home/za/tmp/&lt;ipython-input-111-dea686030e89&gt; in &lt;module&gt;() ----&gt; 1 sa.encode() UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 0: ordinal not in range(128) In [112]: sa.decode() --------------------------------------------------------------------------- UnicodeDecodeError Traceback (most recent call last) /home/za/tmp/&lt;ipython-input-112-a79b22010b0e&gt; in &lt;module&gt;() ----&gt; 1 sa.decode() UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 0: ordinal not in range(128) In [113]: sa.encode('utf-8') --------------------------------------------------------------------------- UnicodeDecodeError Traceback (most recent call last) /home/za/tmp/&lt;ipython-input-113-ed97f8f61eb5&gt; in &lt;module&gt;() ----&gt; 1 sa.encode('utf-8') UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 0: ordinal not in range(128) In [114]: sa.decode('utf-8') Out[114]: u'\u65b0 \u95fb\u3000\u7f51 \u9875\u3000\u8d34 \u5427\u3000\u77e5 \u9053\u3000\u97f3 \u4e50\u3000\u56fe \u7247\u3000\u89c6 \u9891\u3000\u5730 \u56fe' In [115]: cfh.write(sa.decode('utf-8')) </code></pre> <p>It works in the above, but <strong>FAILED</strong> with another machine, same Ubuntu machine, same $LANG env. I keep hitting "'ascii' codec can't ...."</p> <p><strong>Who can point me to a good doc?</strong> the official doc about module <code>codecs</code> is not good for me. </p> <p>===</p> <p>The problem comes from the codes:</p> <pre><code># encoding=utf-8 # ...... def write_video_info_file(folder, filename, infos): # infos : a list of list, lines of text grouped by topic, results of language translations. absfn = os.path.join(folder, filename) with codecs.open(absfn, mode='wb', encoding='utf-8') as fh: for vinfo in infos: for v in vinfo: fh.write(v) fh.write("\n\n" + vi_delimit + "\n\n") </code></pre> <p>This was tested OK in my local machine, and deployed to a remote machine, then it get a lot: <code>UnicodeDecodeError: 'ascii' codec can't</code>.</p> <p>After it, nearly all <code>mode=</code>, open without codecs tried.</p> <pre><code>$ echo $LANG # en_US.UTF-8 </code></pre> <p>Python 2.7.3</p> <p>Ubuntu 12.04</p> <p>LANG=en_US.UTF-8</p> <p>LANGUAGE=</p> <p>LC_ALL=</p> <p>===</p> <p>I got the solution, use this to make sure all string are utf-8:</p> <pre><code>if isinstance(mystring, str): mystring = mystring.decode('utf-8') </code></pre>
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    1. COIt looks like your string already is encoded. If you want to decode it, you need to use `decode('utf-8')` to tell it it decode it as "utf-8". If you want to write it, just write the encoded bytes to the file.
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    2. COThe good doc: http://docs.python.org/2/howto/unicode.html
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      1. POhow to write utf-8 string to utf-8 file on utf-8 machine with python
      1. USMartijn Pieters
    3. COBrenBarn, I can do it with `open`, or the method above. *But* both failed on another machine, same OS (Ubuntu/Linux), same Python.
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      1. USAndrew_1510
 

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