大约有 30,000 项符合查询结果（耗时：0.0459秒） [XML]
get NSDate today, yesterday, this Week, last Week, this Month, last Month… variables
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Adapted from the Date and Time Programming Guide:
// Right now, you can remove the seconds into the day if you want
NSDate *today = [NSDate date];
// All intervals taken from Google
NSDate *yesterday = [today dateByAddingTimeInterval: -86400.0];
NSD...
Generate all permutations of a list without adjacent equal elements
... consideration is globally constrained in some way. The asymptotic running time is optimal, since the overhead of generation is on the order of the length of the output. The worst-case delay unfortunately is quadratic; it could be reduced to linear (optimal) with better data structures.
from collec...
Software Design vs. Software Architecture [closed]
...ngeable, but the consesus is that they are distinct. They are at the same time: different (1) stages, (2) areas of responsibility, and (3) levels of decision-making.
Architecture is the bigger picture: the choice of frameworks, languages, scope, goals, and high-level methodologies (Rational, wa...
Programmatically access currency exchange rates [closed]
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Also, forex rates change all the time, and banks may only take into account the rate at midnight, local time. With ~2% daily volatility, there is incertitude.
– Alexandre C.
Sep 29 '10 at 9:02
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Why is JavaScript called JavaScript, since it has nothing to do with Java? [closed]
...bmitted for standarization to the ECMA International Organization. By that time, Netscape didn't allow the use of the "JavaScript" name, so the standarized language is named ECMAScript.
JavaScript isn't actually an open name. Now it's a trademark of Sun (now Oracle).
There still a lot of confusion...
Get loop counter/index using for…of syntax in JavaScript
...with a next() method that will return subsequent entries in the array each time it is called. There's no (visible) data in it; you get the data in the underlying object by calling next(), which for-of does behind the scenes. cc @tonyg
– Shog9
Sep 29 '17 at 16:3...
Total size of the contents of all the files in a directory [closed]
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This is simple and works! Thanks. Sometimes, I like to add the -L option so du follows symlinks.
– conradkleinespel
Nov 20 '14 at 10:37
2
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Import CSV file into SQL Server
...le Source. Then use the Browse button to select the CSV file. Spend some time configuring how you want the data to be imported before clicking on the Next > button.
• For the Destination, select the correct database provider (e.g. for SQL Server 2012, you can use SQL Server Native Client 11....
Are strongly-typed functions as parameters possible in TypeScript?
...f taste, as these are equivalent forms in a language that doesn't have run-time types. Nowadays you can also use type aliases instead of interfaces.
– Drew Noakes
May 16 '17 at 11:18
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
... method to be more readable.
Using the sample data provided:
>>> %timeit df3.reset_index().drop_duplicates(subset='index', keep='first').set_index('index')
1000 loops, best of 3: 1.54 ms per loop
>>> %timeit df3.groupby(df3.index).first()
1000 loops, best of 3: 580 µs per loop
&...