Tag Archives: utils

How to restrict the length of a unicode string

Ha, not with me! It’s a pretty common tripwire: Imagine you have a unicode string and for whatever reason (which should be a good reason, so make sure you really need this) you need to make sure that its UTF-8 … Continue reading

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How to convert hex strings to binary ascii strings in python (incl. 8bit space)

As this comes across may way again and again: How do you turn a hex string like "c3a4c3b6c3bc" into a nice binary string like this: "11000011 10100100 11000011 10110110 11000011 10111100"? The solution is based on the Python 2.6 new … Continue reading

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Bash prompt indicating return value

Lately I’ve fiddled a lot with installing virtuoso on some virtual machines and found myself repeatedly asking bash for the return value of the last command echo $?. I remembered this blog post by Gecko quite a while ago and … Continue reading

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(URL)Encoding in python

Well, encodings are a never ending story and whenever you don’t want to waste time on them, it’s for sure that you’ll stumble over yet another tripwire. This time it is the encoding of URLs (note: even though related I’m … Continue reading

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Itertools

Just recently came across the python itertools “tools for efficient looping” again. Generators have the advantage of not creating the whole list on definition, but on demand (in contrast to e.g., list comprehensions). Really worth a look: import itertools as … Continue reading

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Precision-Recall diagrams including the F-Measure

Today I was asked how to generate Recall-Precision diagrams including the f-measure values as height-lines from within python. Actually Gunnar was the one who had this idea quite a while ago, but constantly writing things into files, then loading them … Continue reading

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Sort python dictionaries by values

Perhaps you already encountered a problem like the following one yourself: You have a large list of items (let’s say URIs for this example) and want to sum up how often they were viewed (or edited or… whatever). A small … Continue reading

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Min-Heap in Python

I recently wanted to implement a small event system where events can have different priorities. So for example the event with highest priority (lowest value) should be handled first. Python comes with a heapq module which can transform a list … Continue reading

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