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Python - Create a list with initial capacity
...d avoid the list by using a generator instead:
def my_things():
while foo:
#baz
yield bar
#qux
for thing in my_things():
# do something with thing
This way, the list isn't every stored all in memory at all, merely generated as needed.
...
What's wrong with nullable columns in composite primary keys?
...kages have a customized extension that is usually not an integer (like "rc-foo" or "vanilla" or "beta" or whatever else someone for whom four fields is insufficient might dream up). If a package does not have an extension, then it is NULL in the above model, and no harm would be done by leaving thin...
How to get a reference to current module's attributes in Python
...e added for example, via hooking or by the 3dparty tools like pytest:
*** foo ... ..
*** boo ... ..
*** runtest c:\python\x86\37\lib\site-packages\xonsh\pytest_plugin.py 58
*** pytest_runtest_call c:\python\x86\37\lib\site-packages\_pytest\runner.py 125
*** _multicall c:\python\x86\37\lib\site-pack...
What are the differences between a pointer variable and a reference variable in C++?
...lass
{
...
virtual void DoSomething(int,int,int,int,int);
};
void Foo(const My
How can bcrypt have built-in salts?
...
OK, so I sign up for a site and choose a the password "foo". Bcrypt adds a random salt of "akd2!*", resulting in "fooakd2!*", which is hashed and stored. Later, I try to sign in with password "bar". To see if I'm correct, it needs to hash "barakd2!*". If the salt was generated ra...
Checkout subdirectories in Git?
... And is there a way to rename those folders? If I sparse checkout /foo/bar/foobar, is it possible to see it only as /foobar in my local repository?
– graywolf
Aug 5 '18 at 11:11
...
SPAN vs DIV (inline-block)
...an't put block elements inside inline elements so:
<p>...<div>foo</div>...</p>
is not strictly valid even if you change the <div> to inline or inline-block.
So, if your element is inline or inline-block use a <span>. If it's a block level element, use a <di...
How to use Elasticsearch with MongoDB?
... "mongodb": {
"db": "mydb",
"collection": "foo"
},
"index": {
"name": "name",
"type": "random"
}
}'
Test on browser:
http://localhost:9200/_search?q=home
...
How do I pass a variable by reference?
...will reassign the name to a new object whether it is immutable or not? def Foo(alist): alist = [1,2,3] will not modify the contents of the list from the callers perspective.
– Mark Ransom
Nov 15 '11 at 16:46
...
How can I repeat a character in Bash?
...om the question is by far the fastest.
Bash's global string-replacement (${foo// /=}) is inexplicably excruciatingly slow with large strings, and has been taken out of the running (took around 50 minutes(!) in Bash 4.3.30, and even longer in Bash 3.2.57 - I never waited for it to finish).
Bash loops...