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What should main() return in C and C++?
...tes how the program exited. Normal exit is represented by a 0 return value from main. Abnormal exit is signaled by a non-zero return, but there is no standard for how non-zero codes are interpreted. As noted by others, void main() is prohibited by the C++ standard and should not be used. The valid C...
What is the difference between an interface and abstract class?
...e more expensive to use, because there is a look-up to do when you inherit from them.
Abstract classes look a lot like interfaces, but they have something more: You can define a behavior for them. It's more about a person saying, "these classes should look like that, and they have that in common, s...
RuntimeWarning: DateTimeField received a naive datetime
...to the model. Here's how a timezone-aware object looks like:
>>> from django.utils import timezone
>>> import pytz
>>> timezone.now()
datetime.datetime(2013, 11, 20, 20, 8, 7, 127325, tzinfo=pytz.UTC)
And here's a naive object:
>>> from datetime import datetim...
How can I connect to Android with ADB over TCP? [closed]
...ing in Hyper-V , and so I cannot connect directly via USB in the guest or from the host.
37 Answers
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How to read from a file or STDIN in Bash?
The following Perl script ( my.pl ) can read from either the file on the command line args or from STDIN:
15 Answers
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How to install pip with Python 3?
...nd Ubuntu (Trusty Tahr and newer) for Python 2.x
Run the following command from a terminal:
sudo apt-get install python-pip
Installing on Debian (Wheezy and newer) and Ubuntu (Trusty Tahr and newer) for Python 3.x
Run the following command from a terminal:
sudo apt-get install python3-pip
Note:
O...
Running single test from unittest.TestCase via command line
...lls you about several combinations that allow you to run test case classes from a module and test methods from a test case class.
python3 -m unittest -h
[...]
Examples:
python3 -m unittest test_module - run tests from test_module
python3 -m unittest module.TestClass - r...
Git cherry pick vs rebase
...f less obvious use.)
git cherry-pick is for bringing an interesting commit from one line of development to another. A classic example is backporting a security fix made on an unstable development branch to a stable (maintenance) branch, where a merge makes no sense, as it would bring a whole lot of...
What is the difference between pip and conda?
...
Quoting from the Conda blog:
Having been involved in the python world for so long, we are all aware of pip, easy_install, and virtualenv, but these tools did not meet all of our specific requirements. The main problem is that the...
What's the right OAuth 2.0 flow for a mobile app
...52
Consider the following options
Implicit
Should I use implicit?
To quote from Section 8.2 https://tools.ietf.org/html/rfc8252#section-8.2
The OAuth 2.0 implicit grant authorization flow (defined in Section 4.2 of OAuth 2.0 [RFC6749]) generally works with the practice of performing the authorizati...