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Matrix Transpose in Python
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if you're going to iterate through the results, izip from itertools can save memory for large arrays.
– Antony Hatchkins
Mar 28 '13 at 8:38
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Writing a dict to txt file and reading it back?
...ternative to it that is safer. This is called literal_eval and you get it from a Python module called ast.
import ast
def reading(self):
s = open('deed.txt', 'r').read()
self.whip = ast.literal_eval(s)
ast.literal_eval() will only evaluate strings that turn into the basic Python types, ...
How to define a two-dimensional array?
...e as well, but it is no longer recommended for any use, and may be removed from numpy in the future.
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Test whether string is a valid integer
...e The linked document describes the construct for removing a string prefix from a variable used in the case line. It is just at the bottom of the page, but there are no anchors, so I could not directly link to it, see section "Substring Removal"
– Niklas Peter
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Constructors in Go
...struct a sensible default. (While this looks strange to most people coming from "traditional" oop it often works and is really convenient).
Provide a function func New() YourTyp or if you have several such types in your package functions func NewYourType1() YourType1 and so on.
Document if a zero ...
How to insert an element after another element in JavaScript without using a library?
...the following prototypes, you will be able to call these function directly from newly created elements.
newElement.appendBefore(element);
newElement.appendAfter(element);
.appendBefore(element) Prototype
Element.prototype.appendBefore = function (element) {
element.parentNode.insertBefore(t...
How to run crontab job every week on Sunday
...e of sun, mon, tue, wed, thu, fri, or sat for the day. This also saves you from having to choose between using 0 or 7 for sunday.
– flu
May 15 '14 at 13:15
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How to convert a table to a data frame
...rs, another way I've used is data.frame(rbind(mytable)). Using the example from @X.X:
> freq_t = table(cyl = mtcars$cyl, gear = mtcars$gear)
> freq_t
gear
cyl 3 4 5
4 1 8 2
6 2 4 1
8 12 0 2
> data.frame(rbind(freq_t))
X3 X4 X5
4 1 8 2
6 2 4 1
8 12 0 2
If t...
How can I calculate an md5 checksum of a directory?
...m with the name of the file (or even better, the relative path of the file from /path/to/dir/) so it is taken into account in the final checksum.
– Michael Zilbermann
May 16 '13 at 8:02
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How to return a part of an array in Ruby?
...turns a subarray specified by range. Negative indices count
backward from the end of the array (-1 is the last element).
Returns nil if the index (or starting index) are out of range.
a = [ "a", "b", "c", "d", "e" ]
a[2] + a[0] + a[1] #=> "cab"
a[6] ...