大约有 40,700 项符合查询结果（耗时：0.0553秒） [XML]
What is the difference between an expression and a statement in Python?
In Python, what is the difference between expressions and statements?
14 Answers
14
...
Separation of business logic and data access in django
I am writing a project in Django and I see that 80% of the code is in the file models.py . This code is confusing and, after a certain time, I cease to understand what is really happening.
...
SQL “select where not in subquery” returns no results
Disclaimer: I have figured out the problem (I think), but I wanted to add this issue to Stack Overflow since I couldn't (easily) find it anywhere. Also, someone might have a better answer than I do.
...
Should I use Vagrant or Docker for creating an isolated environment? [closed]
... use Ubuntu for development and deployment and have a need for creating an isolated environment.
10 Answers
...
Understanding Canvas and Surface concepts
...aceView and therefore the whole Surface / Canvas / Bitmap system, which is used in Android.
3 Answers
...
What is the role of the bias in neural networks? [closed]
... the gradient descent and the back-propagation algorithm. What I don't get is: when is using a bias important and how do you use it?
...
Why does Java have transient fields?
...
The transient keyword in Java is used to indicate that a field should not be part of the serialization (which means saved, like to a file) process.
From the Java Language Specification, Java SE 7 Edition, Section 8.3.1.3. transient Fields:
Variables...
Is there a standardized method to swap two variables in Python?
In Python, I've seen two variable values swapped using this syntax:
7 Answers
7
...
Differences in boolean operators: & vs && and | vs ||
...
Those are the bitwise AND and bitwise OR operators.
int a = 6; // 110
int b = 4; // 100
// Bitwise AND
int c = a & b;
// 110
// & 100
// -----
// 100
// Bitwise OR
int d = a | b;
// 110
// | 100
// -----
// 110
System...
Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
A co-worker claimed recently in a code review that the [[ ]] construct is to be preferred over [ ] in constructs like
...