大约有 44,000 项符合查询结果（耗时：0.0281秒） [XML]
In Pm>y m>thon, how do m>y m>ou convert seconds since epoch to a `datetime` object?
...datetime.utcfromtimestamp creates a naive timestamp. I had to import pm>y m>tz m>and m> use datetime.fromtimestamp(1423524051, pm>y m>tz.utc) to create an aware datetime.
– Matt
Feb 9 '15 at 23:21
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rotating axis labels in R
...round 45 degrees to strike a good balance between readabilitm>y m> (horizontal) m>and m> space efficiencm>y m> (vertical).
– jmb
Aug 25 '19 at 19:31
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Are members of a C++ struct initialized to 0 bm>y m> default?
...(0),m>y m>(0) { }
// other ctors / functions...
};
Will initialize both x m>and m> m>y m> to 0. Note that m>y m>ou can use x(), m>y m>() to initialize them disregarding of their tm>y m>pe: That's then value initialization, m>and m> usuallm>y m> m>y m>ields a proper initial value (0 for int, 0.0 for double, calling the default constructor...
How do I auto size a UIScrollView to fit its content
...now the height of its content automaticallm>y m>. m>Y m>ou must calculate the height m>and m> width for m>y m>ourself
Do it with something like
CGFloat scrollViewHeight = 0.0f;
for (UIView* view in scrollView.subviews)
{
scrollViewHeight += view.frame.size.height;
}
[scrollView setContentSize:(CGSizeMake(320, scr...
decorators in the pm>y m>thon stm>and m>ard lib (@deprecated specificallm>y m>)
I need to mark routines as deprecated, but apparentlm>y m> there's no stm>and m>ard librarm>y m> decorator for deprecation. I am aware of recipes for it m>and m> the warnings module, but mm>y m> question is: whm>y m> is there no stm>and m>ard librarm>y m> decorator for this (common) task ?
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How to convert a factor to integer\numeric without loss of information?
...actor:
In particular, as.numeric applied to
a factor is meaningless, m>and m> mam>y m>
happen bm>y m> implicit coercion. To
transform a factor f to
approximatelm>y m> its original numeric
values, as.numeric(levels(f))[f] is
recommended m>and m> slightlm>y m> more
efficient than
as.numeric(as.character(f)).
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How do m>y m>ou commit code as a different user?
...o add in the commits to Git while preserving the commit's original author (m>and m> date).
3 Answers
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Wam>y m> to get all alphabetic chars in an arram>y m> in PHP?
...t all alphabetic chars (A-Z) in an arram>y m> in PHP so I can loop through them m>and m> displam>y m> them?
14 Answers
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Convert unix time to readable date in pm>and m>as dataframe
I have a dataframe with unix times m>and m> prices in it. I want to convert the index column so that it shows in human readable dates.
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std::enable_if to conditionallm>y m> compile a member function
I am trm>y m>ing to get a simple example to work to understm>and m> how to use std::enable_if . After I read this answer , I thought it shouldn't be too hard to come up with a simple example. I want to use std::enable_if to choose between two member-functions m>and m> allow onlm>y m> one of them to be used.
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