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How to len(generator()) [duplicate]
...
Suppose we have a generator:
def gen():
for i in range(10):
yield i
We can wrap the generator, along with the known length, in an object:
import itertools
class LenGen(object):
def __init__(self,gen,length):
self.gen=gen
self.length=length
...
What is the difference between HAVING and WHERE in SQL?
..._name < 3
GROUP
BY column_name
) pointless_range_variable_required_here
WHERE column_name_tally >= 3;
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follo...
Why does i = i + i give me 0?
...1073741824 changes to
-2147483648 and one more further addition is out of range of int and turns to Zero .
#include<stdio.h>
#include<conio.h>
int main()
{
static int i = 1;
while (true){
i = i + i;
printf("\n%d",i);
_getch();
}
return 0;
}
...
How can I make a Python script standalone executable to run without ANY dependency?
...(ELF on Linux). It has been around for a few years now and supports a wide range of Python versions.
You will probably also get a performance improvement if you use it. It is recommended.
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Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip)
...hortestLength = Math.min(lista.size(),listb.size());
return IntStream.range(0,shortestLength).mapToObj( i -> {
return zipper.apply(lista.get(i), listb.get(i));
});
}
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Two-way encryption: I need to store passwords that can be retrieved
...attack will also give them full access to the keys involved. Sniffing the raw HTTP traffic will also give them the keys.
Use SSL for all traffic. And make sure nothing on the server has any kind of vulnerabilities (CSRF, XSS, SQL Injection, Privilege Escalation, Remote Code Execution, etc).
Edi...
C library function to perform sort
...son/sort has just two header files you can include to get access to a wide range of incredibly fast sorting routings, like so:
#define SORT_NAME int64
#define SORT_TYPE int64_t
#define SORT_CMP(x, y) ((x) - (y))
#include "sort.h"
/* You now have access to int64_quick_sort, int64_tim_sort, etc., e....
How do I declare and initialize an array in Java?
.../8/docs/api/java/util/stream/IntStream.html
int [] myIntArray = IntStream.range(0, 100).toArray(); // From 0 to 99
int [] myIntArray = IntStream.rangeClosed(0, 100).toArray(); // From 0 to 100
int [] myIntArray = IntStream.of(12,25,36,85,28,96,47).toArray(); // The order is preserved.
int [] myIntA...
How do shift operators work in Java? [duplicate]
... Java defines shift to mask (wrap around) the count down to the 0-31 range, rather than saturate to 32 (if shift by 32 left only zeroes). (using 32bit types for example, obviously.) I assume this decision was made to match the behaviour of the x86 shift & rotate instructions. By compari...
How can I calculate the number of lines changed between two commits in git?
... might be interested in things like --since (rather than specifying commit ranges, just select commits since last week) and --no-merges (merge commits don't actually introduce changes), as well as the pretty output options (--pretty=oneline, short, medium, full...).
Here's a one-liner to get total ...