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What does “hashable” mean in Python?
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answered Jan 26 '13 at 9:49
NPENPE
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Pandas percentage of total with groupby
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214
Paul H's answer is right that you will have to make a second groupby object, but you can calcu...
Why is there no Tree class in .NET?
...ook at C5? It's super-handy and they have several tree implementations (1, 2, 3).
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How can I get zoom functionality for images?
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208
UPDATE
I've just given TouchImageView a new update. It now includes Double Tap Zoom and Fling...
How can I remove an element from a list?
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227
I don't know R at all, but a bit of creative googling led me here: http://tolstoy.newcastle.ed...
Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
...s in the array, despite h[1] still giving us a value? Here’s a hint:
h[42] #=> ["a", "b"]
The array returned by each [] call is just the default value, which we’ve been mutating all this time so now contains our new values. Since << doesn’t assign to the hash (there can never be a...
What is your favorite C programming trick? [closed]
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Removing duplicate objects with Underscore for Javascript
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233
.uniq/.unique accepts a callback
var list = [{a:1,b:5},{a:1,c:5},{a:2},{a:3},{a:4},{a:3},{a:2...
Is there a Python function to determine which quarter of the year a date is in?
...ore the division, and dividing by 4 instead of 3. Since .month goes 1 to 12, it's easy to check for yourself what formula is right:
for m in range(1, 13):
print m//4 + 1,
print
gives 1 1 1 2 2 2 2 3 3 3 3 4 -- two four-month quarters and a single-month one (eep).
for m in range(1, 13):
prin...
How to get the Power of some Integer in Swift language?
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