python .insert() or .append() is not working as usual, the output is coming as none and the loop is not iterated completely
<p>Here I am trying to convert a string into list without using any inbuilt functions like 'list' or 'split' but .append() or .insert() functions are not adding elements to the list</p>

<pre><code>r=[]
x='abcd'
for i in xrange(0,len(x)):
    print x[i]
    r=r.insert(0,x[i])
    print r
</code></pre>