Initializing nested lists correctly

If you want to initialize a list with a certain size in Python, you can use the following clean syntax: >>> arr = [None]*3 >>> arr [None, None, None] We can then fill the list with elements: >>> arr[1] = 1 >>> arr [None, 1, None] But watch what happens when we try to use the same syntax for declaring a 2D dynamic …

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Regular expressions with optional starting or ending groups

Stemming and lemmatizing with sklearn vectorizers

Applying operations on grouped dataframes in Pandas

Zip is its own inverse

Flatten nested lists with a list comprehension

Wrong feature preprocessing is a source of train-test leakage

Masking with Boolean arrays in Numpy

Site update: Breadcrumbs, taxonomies, paginators

Secondary sorting in Python

Hugo template snippets of new website features

Vacancy Recommender Hackaton with Spark

Getting a grip on programmer jargon (by Joran Welling)

Selecting user commands in style (Python)

Object Orientation: Observer Pattern


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