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List comprehension: Returning two (or more) items for each item
...ch is marginally faster than using double list comprehension.
nums = range(100000)
def double_comprehension():
return [func(x) for x in nums for func in (f,g)]
def list_extend():
result = []
extend = result.extend
for x in nums:
extend((f(x),g(x)))
return result
%timei...
Bash tool to get nth line from a file
...y preference using redirects, because me often used redirects like sed -n '100p' < <(some_command) - so, universal syntax :). It is NOT less effective, because redirection are done with shell when forking itself, so... it is only a preference... (and yes, it is one character longer) :)
...
Why would $_FILES be empty when uploading files to PHP?
...e uploading in PHP:
Check php.ini for:
file_uploads = On
post_max_size = 100M
upload_max_filesize = 100M
You might need to use .htaccess or .user.ini if you are on shared hosting and don't have access to php.ini.
Make sure
you’re editing the correct ini file –
use the phpinfo() function to v...
How can I divide two integers to get a double?
...D's answer
To have a greater precision you can cast to decimal:
(decimal)100/863
//0.1158748551564310544611819235
Or:
Decimal.Divide(100, 863)
//0.1158748551564310544611819235
Double are represented allocating 64 bits while decimal uses 128
(double)100/863
//0.11587485515643106
In depth ex...
Auto Scale TextView Text to Fit within Bounds
...m"
android:autoSizeMinTextSize="12sp"
android:autoSizeMaxTextSize="100sp"
android:autoSizeStepGranularity="2sp" />
Programmatically:
setAutoSizeTextTypeUniformWithConfiguration(int autoSizeMinTextSize, int autoSizeMaxTextSize,
int autoSizeStepGranularity, int unit)
textV...
Is it better to call ToList() or ToArray() in LINQ queries?
...g to .ToList()
foreach (var x in source)
{
if (x == 5)
source[8] *= 100;
Console.WriteLine(x);
}
The above code will run with no exception and produces the output:
1
2
3
4
5
6
7
8
900
10
This shows that the IEnumarator<int> returned by an int[] does not keep track on whether the a...
How do you know what to test when writing unit tests? [closed]
... it, as there were so many different payment options.
An invoice could be $100 but the customer only transferred $99.
Maybe you have sent sales invoices to a customer but you have also purchased from that customer.
So you sold him for $300 but you bought for $100. You can expect your customer to pay...
T-SQL split string
...o the outer query in order to avoid errors with recursion for strings > 100 characters. If that is also not a good alternative then see this answer as pointed out in the comments.
(Also, the delimiter will have to be NCHAR(<=1228). Still researching why.)
More on split functions, why (and pr...
What are the rules for evaluation order in Java?
...nceton.edu/java/11precedence/
Here is a good example:
System.out.println(3+100/10*2-13);
Question: What's the Output of the above Line?
Answer: Apply the Rules of Precedence and Associativity
Step 1: According to rules of precedence: / and * operators take priority over + - operators. Therefore th...
How to select rows from a DataFrame based on column values?
...f['A'] == 'foo'
5.84 µs ± 195 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
166 µs ± 4.45 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
Evaluating the mask with the numpy array is ~ 30 times faster. This is partly due to numpy evaluation often being faster. It ...