Unexpected indent Python
<p>I keep getting the error "unexpected indent" for the line "lijst2 = lijst + [cat]" in the following code. I have no idea why, because as far as I can see indentation seems to be correct? Please keep in mind I am a beginner. Thank you! This is my code:</p>

<pre><code>for fileid in corpus.fileids():
    tekst1 = corpus.words(fileid)
    instantie = defaultdict(float) 
    cat = mijn_corpus.fileids() 
    for word in tekst1:
        if word in freq: 
           instantie[word] +=1     
    for word in freq:
        if word not in tekst1:
            instantie[word] +=0
    lijst1 = [] 
    for key, value in instantie.iteritems():   
        lijst1.append(value)
        lijst2 = lijst + [cat] # Here I get the error message: unexpected indent
        resultaten.writerrow(lijst2) 
</code></pre>
