大约有 47,000 项符合查询结果（耗时：0.0429秒） [XML]
Why is the order in dictionaries and sets arbitrary?
I don't understand how looping over a dictionary or set in python is done by 'arbitrary' order.
6 Answers
...
Get list of passed arguments in Windows batch script (.bat)
...
dancavallaro has it right, %* for all command line parameters (excluding the script name itself). You might also find these useful:
%0 - the command used to call the batch file (could be foo, ..\foo, c:\bats\foo.bat, etc.)
%1 is the first command line parameter,
%2 ...
Extracting bits with a single multiplication
I saw an interesting technique used in an answer to another question , and would like to understand it a little better.
...
“Connection for controluser as defined in your configuration failed” with phpMyAdmin in XAMPP
I have just installed XAMPP on my Windows XP machine, and I get an error saying:
12 Answers
...
Can someone give an example of cosine similarity, in a very simple, graphical way?
... want to know how similar these texts are, purely in terms of word counts (and ignoring word order). We begin by making a list of the words from both texts:
me Julie loves Linda than more likes Jane
Now we count the number of times each of these words appears in each text:
me 2 2
Jane ...
What is “entropy and information gain”?
I am reading this book ( NLTK ) and it is confusing. Entropy is defined as :
7 Answers
...
Undefined behavior and sequence points
...
C++98 and C++03
This answer is for the older versions of the C++ standard. The C++11 and C++14 versions of the standard do not formally contain 'sequence points'; operations are 'sequenced before' or 'unsequenced' or 'indetermina...
Speed up the loop operation in R
... over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the runtime.
...
How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators dif
What is the difference between == and === in PHP?
11 Answers
11
...
What does the “yield” keyword do?
What is the use of the yield keyword in Python, and what does it do?
42 Answers
42
...