Unindent does not match any outer indentation level?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/492387/indentationerror-unindent-does-not-match-any-outer-indentation-level">IndentationError: unindent does not match any outer indentation level</a>  </p>
</blockquote>



<p>I have the following python code.</p>

<pre><code>import sys

ins = open( sys.argv[1], "r" )
array = []
for line in ins:
    s = line.split()
    array.append( s[0] ) # &lt;-- Error here 
print array

ins.close()
</code></pre>

<p>The python interpreter complains </p>

<pre><code>  File "sort.py", line 7
    array.append( s[0] )
                       ^
IndentationError: unindent does not match any outer indentation level
</code></pre>

<p>Why so? And how to correct this error?</p>
