Python dict question. How to group similar strings?
for i in names:
dict[i] = {'firstname': name[i]['firstname'],
'lastname': name[i]['lastname']}
print dict[0]['firstname'] # John
print dict[0]['lastname'] # Doe
# group similar lastnames, along with their firstnames
# ...
return render_to_response('index.html', dict)
I want to group names that end with similar last-names. For example, the output should be:
<html>
<body>
<h1> Doe </h1>
<p> John, Jason, Peter </p>
开发者_如何学Go<h1> Avery </h1>
<p> Kelly, Brittany </p>
</body>
</html>
The 'h1' tags are supposed to contain the last-names and the 'p' tags the first-names.
How should I do this?
You mean something like this:
import collections
data = [
{'firstname': 'John', 'lastname': 'Smith'},
{'firstname': 'Samantha', 'lastname': 'Smith'},
{'firstname': 'shawn', 'lastname': 'Spencer'},
]
new_data = collections.defaultdict(list)
for d in data:
new_data[d['lastname']].append(d['firstname'])
print new_data
Output :
defaultdict(<type 'list'>, {'Smith': ['John', 'Samantha'], 'Spencer': ['shawn']})
in your template do:
{% for lastname, firstname in data.items %}
<h1> {{ lastname }} </h1>
<p> {{ firstname|join:", " }} </p>
{% endfor %}
output:
<h1> Smith </h1>
<p> John, Samantha </p>
<h1> Spencer </h1>
<p> shawn </p>
You may also use groupby after you have sorted the names. You can see it here: http://docs.python.org/library/itertools.html#itertools.groupby
加载中,请稍侯......
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