author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 07 Apr 2009 22:22:43 +0000 | |
changeset 2126 | df06ceda7dcc |
parent 109 | 620f9b141567 |
permissions | -rw-r--r-- |
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Outputting CSV with Django |
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========================== |
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This document explains how to output CSV (Comma Separated Values) dynamically |
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using Django views. |
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To do this, you can either use the `Python CSV library`_ or the Django template |
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system. |
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.. _Python CSV library: http://www.python.org/doc/current/lib/module-csv.html |
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Using the Python CSV library |
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============================ |
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Python comes with a CSV library, ``csv``. The key to using it with Django is |
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that the ``csv`` module's CSV-creation capability acts on file-like objects, |
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and Django's ``HttpResponse`` objects are file-like objects. |
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.. admonition:: Note |
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For more information on ``HttpResponse`` objects, see |
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`Request and response objects`_. |
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For more information on the CSV library, see the `CSV library docs`_. |
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.. _Request and response objects: ../request_response/ |
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.. _CSV library docs: http://www.python.org/doc/current/lib/module-csv.html |
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Here's an example:: |
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import csv |
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from django.http import HttpResponse |
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def some_view(request): |
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# Create the HttpResponse object with the appropriate CSV header. |
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response = HttpResponse(mimetype='text/csv') |
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response['Content-Disposition'] = 'attachment; filename=somefilename.csv' |
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writer = csv.writer(response) |
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writer.writerow(['First row', 'Foo', 'Bar', 'Baz']) |
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writer.writerow(['Second row', 'A', 'B', 'C', '"Testing"', "Here's a quote"]) |
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return response |
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The code and comments should be self-explanatory, but a few things deserve a |
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mention: |
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* The response gets a special mimetype, ``text/csv``. This tells |
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browsers that the document is a CSV file, rather than an HTML file. If |
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you leave this off, browsers will probably interpret the output as HTML, |
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which will result in ugly, scary gobbledygook in the browser window. |
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* The response gets an additional ``Content-Disposition`` header, which |
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contains the name of the CSV file. This filename is arbitrary; call it |
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whatever you want. It'll be used by browsers in the "Save as..." |
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dialogue, etc. |
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* Hooking into the CSV-generation API is easy: Just pass ``response`` as |
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the first argument to ``csv.writer``. The ``csv.writer`` function expects |
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a file-like object, and ``HttpResponse`` objects fit the bill. |
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* For each row in your CSV file, call ``writer.writerow``, passing it an |
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iterable object such as a list or tuple. |
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* The CSV module takes care of quoting for you, so you don't have to worry |
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about escaping strings with quotes or commas in them. Just pass |
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``writerow()`` your raw strings, and it'll do the right thing. |
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Using the template system |
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========================= |
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Alternatively, you can use the `Django template system`_ to generate CSV. This |
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is lower-level than using the convenient CSV, but the solution is presented |
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here for completeness. |
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The idea here is to pass a list of items to your template, and have the |
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template output the commas in a ``{% for %}`` loop. |
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Here's an example, which generates the same CSV file as above:: |
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from django.http import HttpResponse |
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from django.template import loader, Context |
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def some_view(request): |
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# Create the HttpResponse object with the appropriate CSV header. |
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response = HttpResponse(mimetype='text/csv') |
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response['Content-Disposition'] = 'attachment; filename=somefilename.csv' |
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# The data is hard-coded here, but you could load it from a database or |
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# some other source. |
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csv_data = ( |
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('First row', 'Foo', 'Bar', 'Baz'), |
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('Second row', 'A', 'B', 'C', '"Testing"', "Here's a quote"), |
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) |
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t = loader.get_template('my_template_name.txt') |
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c = Context({ |
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'data': csv_data, |
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}) |
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response.write(t.render(c)) |
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return response |
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The only difference between this example and the previous example is that this |
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one uses template loading instead of the CSV module. The rest of the code -- |
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such as the ``mimetype='text/csv'`` -- is the same. |
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Then, create the template ``my_template_name.txt``, with this template code:: |
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{% for row in data %}"{{ row.0|addslashes }}", "{{ row.1|addslashes }}", "{{ row.2|addslashes }}", "{{ row.3|addslashes }}", "{{ row.4|addslashes }}" |
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{% endfor %} |
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Todd Larsen <tlarsen@google.com>
parents:
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changeset
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112 |
|
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Todd Larsen <tlarsen@google.com>
parents:
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changeset
|
113 |
This template is quite basic. It just iterates over the given data and displays |
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parents:
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changeset
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114 |
a line of CSV for each row. It uses the `addslashes template filter`_ to ensure |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
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changeset
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115 |
there aren't any problems with quotes. If you can be certain your data doesn't |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
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changeset
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116 |
have single or double quotes in it, you can remove the ``addslashes`` filters. |
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parents:
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changeset
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117 |
|
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parents:
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118 |
.. _Django template system: ../templates/ |
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parents:
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119 |
.. _addslashes template filter: ../templates/#addslashes |