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    <p><em>Recursivity</em> is the key here. Try something around that:</p> <pre><code>def parse(it): result = [] while True: try: tk = next(it) except StopIteration: break if tk == '}': break val = next(it) if val == '{': result.append((tk,parse(it))) else: result.append((tk, val)) return result </code></pre> <p>The use case:</p> <pre><code>import pprint data = """ Continent { Name Europe Country { Name UK Dog { Name Fiffi Colour Gray } Dog { Name Smut Colour Black } } } """ r = parse(iter(data.split())) pprint.pprint(r) </code></pre> <p>... which produce (Python 2.6):</p> <pre><code>[('Continent', [('Name', 'Europe'), ('Country', [('Name', 'UK'), ('Dog', [('Name', 'Fiffi'), ('Colour', 'Gray')]), ('Dog', [('Name', 'Smut'), ('Colour', 'Black')])])])] </code></pre> <p>Please take this as only starting point, and feel free to improve the code as you need (depending on your data, a dictionary could have been a better choice, maybe). In addition, the sample code does not handle properly ill formed data (notably extra or missing <code>}</code> -- I urge you to do a full test coverage ;)</p> <hr> <p><strong>EDIT:</strong> Discovering <code>pyparsing</code>, I tried the following which appears to work (much) better and could be (more) easily tailored for special needs:</p> <pre><code>import pprint from pyparsing import Word, Literal, Forward, Group, ZeroOrMore, alphas def syntax(): lbr = Literal( '{' ).suppress() rbr = Literal( '}' ).suppress() key = Word( alphas ) atom = Word ( alphas ) expr = Forward() pair = atom | (lbr + ZeroOrMore( expr ) + rbr) expr &lt;&lt; Group ( key + pair ) return expr expr = syntax() result = expr.parseString(data).asList() pprint.pprint(result) </code></pre> <p>Producing:</p> <pre><code>[['Continent', ['Name', 'Europe'], ['Country', ['Name', 'UK'], ['Dog', ['Name', 'Fiffi'], ['Colour', 'Gray']], ['Dog', ['Name', 'Smut'], ['Colour', 'Black']]]]] </code></pre>
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    1. USSylvain Leroux
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    1. COUsing `split()` to break up tokens works for this sample data, but not all inputs may be so nicely formatted. `split()` will fail if the trailing braces are entered as "}}}", for instance, or if any entry contains braces inside a quoted string.
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      1. USPaulMcG
    2. CO@PaulMcGuire that is correct. The initial question does not specify entirely the format of input data. Regarding white-spaces around curly braces -- a regexp would do the trick. If the grammar is more complex, for instance as you said, containing quoted stings -- `pyparsing` still would be a better bet.
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    3. CONice work, this is a more rigorous parser than just using nestedExpr, you retain the key+value relationships. Welcome to pyparsing, Sylvain!
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