大约有 32,000 项符合查询结果（耗时：0.0357秒） [XML]
Is there a better alternative than this to 'switch on type'?
...ottom anyway. A couple of fail safe options for this could be to order the array to ensure default is last (bit wasteful) or pop the default in a variable to be processed after the foreach (which would only ever happen if a match wasn't found)
– musefan
Aug 14 ...
Random row selection in Pandas dataframe
...m import sample
# given data frame df
# create random index
rindex = np.array(sample(xrange(len(df)), 10))
# get 10 random rows from df
dfr = df.ix[rindex]
share
|
improve this answer
...
How to find difference between two Joda-Time DateTimes in minutes
...ce just isn't cool. Imagine having to perform a time difference on a large array of date/time objects.
– AndroidDev
Jun 16 '18 at 7:20
|
sho...
Mongoose's find method with $or condition does not work properly
...'},
{ nickname: 'somethang'}
]).exec();
console.log(body);
}
/* Gives an array of the searched query!
returns [] if not found */
share
|
improve this answer
|
follow
...
Optimise PostgreSQL for fast testing
... then you can turn then off
random_page_cost: if you have SSD or fast RAID array you can lower this to 2.0 (RAID) or even lower (1.1) for SSD
checkpoint_segments: you can go higher 32 or 64 and change checkpoint_completion_target to 0.9. Lower value allows faster after-crash recovery
...
How to write a Ruby switch statement (case…when) with regex and backreferences?
...result but doesn't use a switch. If you put your regular expressions in an array, you could do something like this:
res = [ /pat1/, /pat2/, ... ]
m = nil
res.find { |re| m = foo.match(re) }
# Do what you will with `m` now.
Declaring m outside the block allows it to still be available after find...
Is there a zip-like function that pads to longest length in Python?
...
Im using a 2d array but the concept is the similar using python 2.x:
if len(set([len(p) for p in printer])) > 1:
printer = [column+['']*(max([len(p) for p in printer])-len(column)) for column in printer]
...
Failed binder transaction when putting an bitmap dynamically in a widget
...
You can compress the bitmap as an byte's array and then uncompress it in another activity, like this.
Compress!!
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] bytes ...
Convert DataFrame column type from string to datetime, dd/mm/yyyy format
...
@shootingstars passing the array DatetimeIndex(df['col']).to_pydatetime() should work.
– Andy Hayden
Mar 29 '14 at 18:32
1
...
When to use volatile with multi threading?
...munication that doesn't need any synchronization: it's not publishing that array contents are ready or anything like that. Just a store that's noticed promptly by a not-optimized-away load in another thread.
// global
bool exit_now = false;
// in one thread
while (!exit_now) { do...