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    <p>To solve use cases like this one, I wrote a small environment filter that counts occurences of a key.</p> <p>Here's de code (with doc test) of myfilters.py:</p> <pre><code>#coding: utf-8 from collections import defaultdict from jinja2 import environmentfilter from jinja2.utils import soft_unicode @environmentfilter def inc_filter(env, key, value=1, result='value', reset=False): """ Count ocurrences of key. Stores the counter on Jinja's environment. &gt;&gt;&gt; class Env: pass &gt;&gt;&gt; env = Env() &gt;&gt;&gt; inc_filter(env, 'x') 1 &gt;&gt;&gt; inc_filter(env, 'x') 2 &gt;&gt;&gt; inc_filter(env, 'y') 1 &gt;&gt;&gt; inc_filter(env, 'x') 3 &gt;&gt;&gt; inc_filter(env, 'x', reset=True) 1 &gt;&gt;&gt; inc_filter(env, 'x') 2 &gt;&gt;&gt; inc_filter(env, 'x', value=0, reset=True) 0 &gt;&gt;&gt; inc_filter(env, 'x', result=None) &gt;&gt;&gt; inc_filter(env, 'x', result=False) u'' &gt;&gt;&gt; inc_filter(env, 'x', result='key') 'x' &gt;&gt;&gt; inc_filter(env, 'x') 4 """ if not hasattr(env, 'counters'): env.counters = defaultdict(int) if reset: env.counters[key] = 0 env.counters[key] += value if result == 'key': return key elif result == 'value': return env.counters[key] elif result == None: return None else: return soft_unicode('') ## Module doctest if __name__ == '__main__': import doctest doctest.testmod() </code></pre> <p>Setup your environment registering our custom filter:</p> <pre><code>#coding: utf-8 from jinja2 import Environment, FileSystemLoader from myfilters import inc_filter env = Environment(loader=loader=FileSystemLoader('path')) env.filters['inc'] = inc_filter t = env.get_template('yourtemplate.txt') items = [ ['foo', 'bar'], ['bax', 'quux', 'ketchup', 'mustard'], ['bacon', 'eggs'], ] res = t.render(items=items) </code></pre> <p>And on your template, use it like this:</p> <pre><code>{% for group in items -%} {% for item in group -%} item={{ item }}, count={{ 'an_identifier'|inc }} {% endfor -%} {% endfor -%} </code></pre> <p>...which prints:</p> <pre><code>item=foo, count=0 item=bar, count=1 item=bax, count=2 item=quux, count=3 item=ketchup, count=4 item=mustard, count=5 item=bacon, count=6 item=eggs, count=7 </code></pre>
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    1. POHow can I make a simple counter with Jinja2 templates?
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    1. USFernando Macedo
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    1. COThat's really cool, thanks!
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