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Python base64 data decode
...g piece of base64 encoded data, and I want to use python base64 module to extract information from it. It seems that module does not work. Can anyone tell me how?
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Fill remaining vertical space with CSS using display:flex
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Make it simple : DEMO
section {
display: flex;
flex-flow: column;
height: 300px;
}
header {
background: tomato;
/* no flex rules, it will grow */
}
div {
flex: 1; /* 1 and it will fill whole space left if no flex value are set to other children*...
How to access the last value in a vector?
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The nice thing with tail is that it works on dataframes too, unlike the x[length(x)] idiom.
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Looping in a spiral
...n need of an algorithm that would let him loop through the elements of an NxM matrix (N and M are odd). I came up with a solution, but I wanted to see if my fellow SO'ers could come up with a better solution.
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List comprehension: Returning two (or more) items for each item
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>>> from itertools import chain
>>> f = lambda x: x + 2
>>> g = lambda x: x ** 2
>>> list(chain.from_iterable((f(x), g(x)) for x in range(3)))
[2, 0, 3, 1, 4, 4]
Timings:
from timeit import timeit
f = lambda x: x + 2
g = lambda x: x ** 2
def fg(x):
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~x + ~y == ~(x + y) is always false?
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Assume for the sake of contradiction that there exists some x and some y (mod 2n) such that
~(x+y) == ~x + ~y
By two's complement*, we know that,
-x == ~x + 1
<==> -1 == ~x + x
Noting this result, we have,
~(x+y) == ~x + ~y
<==> ~(x+y) + (x+...
Real life example, when to use OUTER / CROSS APPLY in SQL
...SS / OUTER APPLY with a colleague and we're struggling to find real life examples of where to use them.
4 Answers
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Get MIME type from filename extension
How can I get the MIME type from a file extension?
24 Answers
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Renaming columns in pandas
...can do something like: new_columns = df.columns.values; new_columns[0] = 'XX'; df.columns = new_columns
– cd98
Nov 20 '13 at 14:18
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What is x after “x = x++”?
What happens (behind the curtains) when this is executed?
17 Answers
17
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