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Python module os.chmod(file, 664) does not change the permission to rw-rw-r— but -w--wx----
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130
Found this on a different forum
If you're wondering why that leading zero is important, it...
Is there a way to pass optional parameters to a function?
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115
The Python 2 documentation, 7.6. Function definitions gives you a couple of ways to detect whe...
File content into unix variable with newlines
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188
The assignment does not remove the newline characters, it's actually the echo doing this. You ...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...ulates the inverse square root of a float, 4x faster than regular (float)(1.0/sqrt(x)) , including a strange 0x5f3759df constant. See the code below. Can someone explain line by line what exactly is going on here and why this works so much faster than the regular implementation?
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Wget output document and headers to STDOUT
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169
Try the following, no extra headers
wget -qO- www.google.com
Note the trailing -. This is p...
Difference between numpy.array shape (R, 1) and (R,)
In numpy , some of the operations return in shape (R, 1) but some return (R,) . This will make matrix multiplication more tedious since explicit reshape is required. For example, given a matrix M , if we want to do numpy.dot(M[:,0], numpy.ones((1, R))) where R is the number of rows (of co...
Iterating Through a Dictionary in Swift
...en would stay at 25.
let interestingNumbers = [
"Prime": [2, 3, 5, 7, 11, 13],
"Fibonacci": [1, 1, 2, 3, 5, 8],
"Square": [1, 4, 9, 16, 25]
]
var largest = 0
for (kind, numbers) in interestingNumbers {
println("kind: \(kind)")
for number in numbers {
if number > large...
Import pandas dataframe column as string not int
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154
Just want to reiterate this will work in pandas >= 0.9.1:
In [2]: read_csv('sample.csv', d...
Evaluate expression given as a string
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431
The eval() function evaluates an expression, but "5+5" is a string, not an expression. Use parse...
What is the difference between '/' and '//' when used for division?
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