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Python argparse mutual exclusive group
...ptions within the group mutually exclusive.
What you're looking for is subcommands. Instead of prog [ -a xxxx | [-b yyy -c zzz]], you'd have:
prog
command 1
-a: ...
command 2
-b: ...
-c: ...
To invoke with the first set of arguments:
prog command_1 -a xxxx
To invoke with the...
How to remove a field from params[:something]
...ration form, which is a form for the Users model, takes a string value for company. However, I have just made a change such that users belongs_to companies. Therefore, I need to pass an object of Company to the Users model.
...
Why does Popen.communicate() return b'hi\n' instead of 'hi'?
...
The echo command by default returns a newline character
Compare with this:
print(subprocess.Popen("echo -n hi", \
shell=True, stdout=subprocess.PIPE).communicate()[0])
As for the b preceding the string it indicates that it is ...
Callback when CSS3 transition finishes
...docs/Web/CSS/CSS_Transitions/Using_CSS_transitions#Detecting_the_start_and_completion_of_a_transition
For animations it's very similar:
$("#someSelector").bind("animationend webkitAnimationEnd oAnimationEnd MSAnimationEnd", function(){ ... });
Note that you can pass all of the browser prefixed e...
HEAD and ORIG_HEAD in Git
...
HEAD is (direct or indirect, i.e. symbolic) reference to the current commit. It is a commit that you have checked in the working directory (unless you made some changes, or equivalent), and it is a commit on top of which "git commit" would make a new one. Usually HEAD is symbolic reference to ...
docker mounting volumes on host
...
The VOLUME command will mount a directory inside your container and store any files created or edited inside that directory on your hosts disk outside the container file structure, bypassing the union file system.
The idea is that your...
Cast Object to Generic Type for returning
...cast an object to return value of a method?
I tried this way but it gave a compile time exception in "instanceof" part:
3 A...
How to serialize Joda DateTime with Jackson JSON processor?
...
This has become very easy with Jackson 2.0 and the Joda module.
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JodaModule());
Maven dependency:
<dependency>
<groupId>com.fasterxml.jackson.datatype...
Consequences of using graft in Mercurial
... like this, it's clear that we can merge D and F.
Merging is a matter of "completing the diamond". So we find a new state M that is a mix of D and F and where the difference from D to M is similar to +f and the difference from F to M is similar to -e. It looks like this:
-e +f'
.---- D -...
Mongoose indexing in production code
...
I've never understood why the Mongoose documentation so broadly recommends disabling autoIndex in production. Once the index has been added, subsequent ensureIndex calls will simply see that the index already exists and then return. So it only has an effect on performance when you're firs...