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How to study design patterns? [closed]
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96
My two cents for such and old question
Some people already mentioned, practice and refactoring...
When is assembly faster than C?
...les that still need compiler-specific code, see
Getting the high part of 64 bit integer multiplication: A portable version using uint64_t for 32x32 => 64-bit multiplies fails to optimize on a 64-bit CPU, so you need intrinsics or __int128 for efficient code on 64-bit systems.
_umul128 on Windo...
Assign pandas dataframe column dtypes
...-05-01
1 b 2 2018-05-02
df.dtypes
x object
y int64
z datetime64[ns]
dtype: object
and confirm the dtype is updated.
OLD/DEPRECATED ANSWER for pandas 0.12 - 0.16: You can use convert_objects to infer better dtypes:
In [21]: df
Out[21]:
x y
0 a 1
1 b 2
In ...
What is the difference between HAVING and WHERE in SQL?
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96
HAVING specifies a search condition for a
group or an aggregate function used in SELECT st...
How to style CSS role
...void problems with specificity.
[role=main] {
background: rgba(48, 96, 144, 0.2);
}
div,
span {
padding: 5px;
margin: 5px;
display: inline-block;
}
<div id="content" role="main">
<span role="main">Hello</span>
</div>
...
Automatically update version number
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96
With the "Built in" stuff, you can't, as using 1.0.* or 1.0.0.* will replace the revision and b...
htmlentities() vs. htmlspecialchars()
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96
Because:
Sometimes you're writing XML data, and you can't use HTML entities in a XML file.
Be...
How to multiply duration by integer?
... leave implicit numeric conversion out. After looking back on this that int64(...) * Duration makes much more sense than casting to Duration, which is just a basic violation of how units should work. Sadly that doesn't work. You really have to do Duration * Duration which is horrible.
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java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist
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84
I tried all possible options but result is zero. Finally i found correct solution which is help...
javascript i++ vs ++i [duplicate]
...r c = i++ * 2; // equivalent to `var c = i*2; i = i+1;`
console.log(c); // 84
console.log(i); // 43
// Example D
var i = 42;
var d = ++i * 2; // equivalent to `i = i+1; var d = i*2;`
console.log(d); // 86
console.log(i); // 43
Notice that in Example C, the i++ is not evaluated until after multipl...