大约有 16,000 项符合查询结果（耗时：0.0304秒） [XML]
Apache Spark: map vs mapPartitions?
...difference between an RDD's map and mapPartitions method?
The method map converts each element of the source RDD into a single element of the result RDD by applying a function. mapPartitions converts each partition of the source RDD into multiple elements of the result (possibly none).
And doe...
Why do std::shared_ptr work
...t>, given the way you constructed it, is the normal one for Test, which converts the pointer to Test* and deletes it.
When you push your shared_ptr<Test> into the vector of shared_ptr<void>, both of those are copied, although the first one is converted to void*.
So, when the vector ...
Exif manipulation library for python [closed]
...
Use PIL :)
import os,sys
from PIL import Image
from PIL.ExifTags import TAGS
if __name__ == '__main__':
for (k,v) in Image.open(sys.argv[1])._getexif().iteritems():
print '%s = %s' % (TAGS.get(k), v)
os.system('pause')
...
Truncate Two decimal places without rounding
...function for real-world usage of truncating a decimal in C#. This could be converted to a Decimal extension method pretty easy if you wanted:
public decimal TruncateDecimal(decimal value, int precision)
{
decimal step = (decimal)Math.Pow(10, precision);
decimal tmp = Math.Truncate(step * va...
constant pointer vs pointer on a constant value [duplicate]
...arse these type of declarations. I also recommend cdecl.org as a site that converts declarations, for example int (*(*foo)(void))[3], into meaningful English text ("declare foo as pointer to function (void) returning pointer to array 3 of int").
– jarmod
Jul 5 ...
What is the best collation to use for MySQL with PHP? [closed]
...Ø Å are the last 3 of the alphabet. With utf8_general_ci, Ø and Å gets converted to O and A, which puts them in the completely wrong position when sorted (I am not sure how Æ is handled, as it is a ligature, not an accented character). This sort order is different in almost any language, e.g. N...
std::string formatting like sprintf
... line explanation:
Aim: Write to a char* by using std::snprintf and then convert that to a std::string.
First, we determine the desired length of the char array using a special condition in snprintf. From cppreference.com:
Return value
[...] If the resulting string gets truncated due to ...
Can't import my own modules in Python
...would have to mess with your path. This can be done within Python:
import sys
sys.path.append("..")
from myapp import SomeObject
though that is generally not recommended.
In general, if you want other people to use your Python package, you should use distutils to create a setup script. That way,...
Why can Java Collections not directly store Primitives types?
...store an int in a List<Integer> the Java compiler will automatically convert it to an Integer.
share
|
improve this answer
|
follow
|
...
How do I remove repeated elements from ArrayList?
...
Although converting the ArrayList to a HashSet effectively removes duplicates, if you need to preserve insertion order, I'd rather suggest you to use this variant
// list is some List of Strings
Set<String> s = new LinkedHashSe...