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Get the key corresponding to the minimum value within a dictionary
... It's easy to get the lowest/highest values but how can we get two or more lowest/highest values?
– astroluv
Oct 15 '18 at 16:38
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How to split a string, but also keep the delimiters?
...s as there was for the StringTokenizer - split(";", true) would be so much more readable than split("((?<=;)|(?=;))").
– Fabian Steeg
Feb 5 '10 at 11:17
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How do I compare version numbers in Python?
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django models selecting single field
...name', flat=True)
That creates a flat list of all eng_names. If you want more than one field per row, you can't do a flat list: this will create a list of tuples:
Employees.objects.values_list('eng_name', 'rank')
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Replace all non-alphanumeric characters in a string
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If doing more than one replace, this will perform slightly quicker if you pre-compile the regex, e.g., import re; regex = re.compile('[^0-9a-zA-Z]+'); regex.sub('*', 'h^&ell.,|o w]{+orld')
– Chris
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John Carmack's Unusual Fast Inverse Square Root (Quake III)
...figure out how and why
this works, and I can't remember the
details anymore.
A slightly better constant, developed by an expert mathematician (Chris Lomont) trying to work out how the original algorithm worked is:
float InvSqrt(float x)
{
float xhalf = 0.5f * x;
int i = *(int*)&x;...
When to use PNG or JPG in iPhone development?
...to display. However, large PNGs may take longer to read from storage than more compressed image formats, and thus be slower to display.
JPG's are smaller to store, but lossy (amount depends on compression level), and to display them requires a much more complicated decoding algorithm. But the typ...
What do the terms “CPU bound” and “I/O bound” mean?
...the amount and speed of the cache available. A task that simply processes more data than fits in the cache will be cache bound.
I/O Bound would be slower than Memory Bound would be slower than Cache Bound would be slower than CPU Bound.
The solution to being I/O bound isn't necessarily to get mor...