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    <p>Range returns either a list of int, or an iterable of int, depending on which version of Python you are using. Attempting to assign that single int into two names causes Python to attempt to iterate through that int in automated tuple unpacking.</p> <p>So, change the </p> <p><code>for index, y in range(index + 1, y):</code></p> <p>to</p> <p><code>for y in range(index + 1, y):</code></p> <p>Also, you use <code>index + 1</code> repeatedly, but mostly to look up the next symbol in your cformula. Since that doesn't change over the course of your outer loop, just assign it its own name once, and keep using that name:</p> <pre><code>for index, x in enumerate(cformula): next_index = index + 1 next_symbol = cformula[next_index] if x == 'C': if next_symbol == 'H' or next_symbol == 'O': C1 += 1 else: for y in range(next_index, 1000000000): if next_symbol != 'H' or next_symbol != 'O': num = y*10 + int(next_symbol) else: C1 += num break </code></pre> <p>I've also refactored out some constants to make the code cleaner. Your inner loop as written was failing on tuple assignment, and would only be counting up the <code>y</code>. Also, your index would be reset again once you exited the inner loop, so you would be processing all of your digits repeatedly.</p> <p>If you want to iterate over the substring after your current symbol, you could just use slice notation to get all of those characters: <code>for subsequent in cformula[next_index:]</code></p> <p>For example:</p> <pre><code>&gt;&gt;&gt; chemical = 'CH3OOCH3' &gt;&gt;&gt; chemical[2:] '3OOCH3' &gt;&gt;&gt; for x in chemical[2:]: ... print x ... 3 O O C H 3 </code></pre>
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    1. POIterating and indexing
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    1. COThanks, your answer has been very helpful. I appreciate you cleaning up my code. Could you elaborate a little on iterating over a substring? It sounds like what I need haha, but to be honest I am extremely new with Python so I don't quite understand what that means
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      1. USYotam Kasznik
    2. COI extended my answer with an example of using a slice to get a substring of the string through which you are iterating.
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