大约有 42,000 项符合查询结果（耗时：0.0373秒） [XML]
UnboundLocalError on local variable when reassigned after first use
The following code works as expected in both Python 2.5 and 3.0:
12 Answers
12
...
count the frequency that a value occurs in a dataframe column
I have a dataset
13 Answers
13
...
Pimpl idiom vs Pure virtual class interface
I was wondering what would make a programmer to choose either Pimpl idiom or pure virtual class and inheritance.
10 Answers...
Stopping scripters from slamming your website
This is about the bag o' crap sales on woot.com. I'm the president of Woot Workshop, the subsidiary of Woot that does the design, writes the product descriptions, podcasts, blog posts, and moderates the forums. I work with CSS/HTML and am only barely familiar with other technologies. I work closely ...
What are good examples of genetic algorithms/genetic programming solutions? [closed]
Genetic algorithms (GA) and genetic programming (GP) are interesting areas of research.
34 Answers
...
Java “Virtual Machine” vs. Python “Interpreter” parlance?
It seems rare to read of a Python "virtual machine" while in Java "virtual machine" is used all the time.
13 Answers
...
.war vs .ear file
What is the difference between a .war and .ear file?
9 Answers
9
...
What is an example of the Liskov Substitution Principle?
I have heard that the Liskov Substitution Principle (LSP) is a fundamental principle of object oriented design. What is it and what are some examples of its use?
...
What is a loop invariant?
I'm reading "Introduction to Algorithm" by CLRS. In chapter 2, the authors mention "loop invariants". What is a loop invariant?
...
How to get element by innerText
How to get tag in html page, if I know what text tag contains.
E.g.:
14 Answers
14
...