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PyQt: removing QTreeView columns

I am using QTreeView with QFileSystemModel. It displays columns like Size, Type, Modification Date, which I don’t need. How can I remove them from the view? I can’t find any removeColumn in model or …

Sum array by number in numpy

Assuming I have a numpy array like: [1,2,3,4,5,6] and another array: [0,0,1,2,2,1] I want to sum the items in the first array by group (the second array) and obtain n-groups results in group number …

How do I disable a Pylint warning?

I’m trying to disable warning C0321 (“more than one statement on a single line” — I often put if statements with short single-line results on the same line), in Pylint 0.21.1 (if it matters: astng 0.20.1, common 0.50.3, and Python 2.6.6 (r266:84292, Sep 15 2010, 16:22:56)). I’ve tried adding disable=C0321 in the Pylint configuration file, but Pylint insists on reporting

Python unittest – opposite of assertRaises?

I want to write a test to establish that an Exception is not raised in a given circumstance. It’s straightforward to test if an Exception is raised … sInvalidPath=AlwaysSuppliesAnInvalidPath() …

Reversible hash function?

I need a reversible hash function (obviously the input will be much smaller in size than the output) that maps the input to the output in a random-looking way. Basically, I want a way to transform a number like “123” to a larger number like “9874362483910978”, but not in a way that will preserve comparisons, so it must not be