大约有 1,400 项符合查询结果（耗时：0.0185秒） [XML]
Preserving signatures of decorated functions
... Computes x*y + 2*z
functools.wraps() is available at least since Python 2.5 but it does not preserve the signature there:
help(funny_function)
# Help on function funny_function in module __main__:
#
# funny_function(*args, **kwargs)
# Computes x*y + 2*z
Notice: *args, **kwargs instead of x,...
jQuery UI Sortable Position
... answered Oct 18 '12 at 19:37
i_ai_a
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...
GroupBy pandas DataFrame and select most common value
... Definitely the way to go for large DataFrames. I had 83M rows and 2.5M unique groups. This took 28 seconds per column, while the agg took over 11 minutes per column.
– ALollz
Apr 10 '18 at 4:15
...
Why isn't Python very good for functional programming? [closed]
... have a lambda with an If inside it. (This is fixed by ternaries in Python 2.5, but it looks ugly.)
Guido threatens to remove map, filter, and reduce every once in a while
On the other hand, python has lexical closures, Lambdas, and list comprehensions (which are really a "functional" concept whet...
Why use @PostConstruct?
...ed on all classes that
support dependency injection.
JSR-250 Chap. 2.5 javax.annotation.PostConstruct
The @PostConstruct annotation allows for the definition of methods to be executed after the instance has been instantiated and all injects have been performed.
public class Car {
@Injec...
NTFS performance and large volumes of files and directories
...mbers above 250 cost a Factor of 2
Directories above 120 cost a Factor of 2.5
The File-Explorer in Windows 7 can handle large #Files or #Dirs, but Usability is still bad.
Introducing Sub-Directories is not expensive
This is the Data (2 Measurements for each File and Directory):
(FOPS = File Ope...
Forward declaring an enum in C++
...hosen - it could be a char or an int, or something else.
From Section 7.2.5 of the ISO C++ Standard:
The underlying type of an enumeration is an integral type that can represent all the enumerator values defined in the enumeration. It is implementation-defined which integral type is used as t...
How to write header row with csv.DictWriter?
...header and data to a file.
Note: with statement was added in 2.6. If using 2.5: from __future__ import with_statement
with open(infile,'rb') as fin:
dr = csv.DictReader(fin, delimiter='\t')
# dr.fieldnames contains values from first row of `f`.
with open(outfile,'wb') as fou:
dw = csv.Dict...
How do I represent a hextile/hex grid in memory?
... answered Jun 1 '13 at 15:59
a paid nerda paid nerd
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...
What is the recommended batch size for SqlBulkCopy?
...ption. I started with 500 and experimented with larger. I found 5000 to be 2.5x faster, on average, than 500. Inserting the 6 million rows takes about 30 seconds with a batch size of 5,000 and about 80 seconds with batch size of 500.
10,000 was not measurably faster. Moving up to 50,000 improved t...