Simon Willison’s Weblog

Entries tagged python in Feb

Filters: Type: entry × Month: Feb × python ×


How to cheat at unit tests with pytest and Black

I’ve been making a lot of progress on Datasette Cloud this week. As an application that provides private hosted Datasette instances (initially targeted at data journalists and newsrooms) the majority of the code I’ve written deals with permissions: allowing people to form teams, invite team members, promote and demote team administrators and suchlike.

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What’s the best way to communicate with go libraries from within Python programs?

Go speaks HTTP extremely well, so one simple but powerful approach is to hook your Go libraries up as simple HTTP+JSON APIs and have Python call them over HTTP (the Requests: HTTP for Humans library is awesome for this).

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What are the best resources for learning regular expressions?

The O’Reilly book on Regular Expressions is absolutely superb. It will help you build a much deeper understanding if how they actually work than any online tutorial I’ve seen.

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What web programming framework best supports ’drag and drop’ actions?  Please give examples of sites and/or plug-ins that support the interaction.

Drag and drop is a client-side thing—it has nothing to do with the server-side technology being used.

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Python Django load MySQL database from csv files performance issue?

Don’t use the Django ORM for bulk imports—the performance overhead is pretty small for regular web page stuff, but it adds up if you are running millions of inserts.

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How can I look up Django functions?

You can use the ./manage.py shell command to get a shell which will import any Django modules (or any of your own code) without complaining about the location of the settings.py module. Install IPython first to get a much more useful interactive shell when you run that command.

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If python dictionaries are inherently orderless, why were they given the name if a real dictionary is sorted by letter?

The metaphor here is that paper dictionaries make it easy to look stuff up by letter or word—just like Python dictionaries make looking something up by key an instant operation.

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How can I install Django in a server without shell access?

I don’t think you can.

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Is South the best tool to use when doing database migrations in Django?

Yes. And I say that as an author of another Django migrations tool (dmigrations) which offered a small subset of South’s current functionality.

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