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Does a favicon have to be 32x32 or 16x16?

... Update for 2020: Sticking to the original question of 16x16 versus 32x32 icons: the current recommendation should be to provide a 32x32 icon, skipping 16x16 entirely. All current browsers and devices support 32x32 icons. The icon will routinely be upscaled to as much as 192x192 de...
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E731 do not assign a lambda expression, use a def

I get this pep8 warning whenever I use lambda expressions. Are lambda expressions not recommended? If not why? 4 Answers ...
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How to add a border just on the top side of a UIView

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Bad value X-UA-Compatible for attribute http-equiv on element meta

... Either X-UA-Compatible is not "standard" HTML (FSVO "standard" that involves appearing on a publicly editable wiki page referenced by the specification) or the Validator isn't up to date with the current status of that wiki. At the...
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When is “i += x” different from “i = i + x” in Python?

... depends entirely on the object i. += calls the __iadd__ method (if it exists -- falling back on __add__ if it doesn't exist) whereas + calls the __add__ method1 or the __radd__ method in a few cases2. From an API perspective, __iadd__ is supposed to be used for modifying mutable objects in pl...
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Fast check for NaN in NumPy

...astest way to check for the occurrence of NaN ( np.nan ) in a NumPy array X . np.isnan(X) is out of the question, since it builds a boolean array of shape X.shape , which is potentially gigantic. ...
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Selecting only numeric columns from a data frame

...e is a list we can use the list-apply functions: nums <- unlist(lapply(x, is.numeric)) Then standard subsetting x[ , nums] ## don't use sapply, even though it's less code ## nums <- sapply(x, is.numeric) For a more idiomatic modern R I'd now recommend x[ , purrr::map_lgl(x, is.numer...
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Is there a way to perform “if” in python's lambda

... The syntax you're looking for: lambda x: True if x % 2 == 0 else False But you can't use print or raise in a lambda. share | impr...
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Inline labels in Matplotlib

In Matplotlib, it's not too tough to make a legend ( example_legend() , below), but I think it's better style to put labels right on the curves being plotted (as in example_inline() , below). This can be very fiddly, because I have to specify coordinates by hand, and, if I re-format the plot, I pro...
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Calculate the center point of multiple latitude/longitude coordinate pairs

...ion on SO asked about finding the average of a set of compass angles. An expansion of the approach recommended there for spherical coordinates would be: Convert each lat/long pair into a unit-length 3D vector. Sum each of those vectors Normalise the resulting vector Convert back to spherical coor...