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Display help message with python argparse when script is called without any arguments
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If you have arguments that must be specified for the script to run - use the required parameter for ArgumentParser as shown below:-
parser.add_argument('--foo', required=True)
parse_args() will report an error if the script is run without any arguments.
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Is there a version control system for database structure changes?
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In Ruby on Rails, there's a concept of a migration -- a quick script to change the database.
You generate a migration file, which has rules to increase the db version (such as adding a column) and rules to downgrade the version (such as removing a column). Each migration is numbered, a...
Phone: numeric keyboard for text input
..., or you can customize the error message for a failed validation using the title attribute.
If you need to be able to enter leading zeros, commas, or letters - for example, international postal codes - check out this slight variant.
Credits and further reading:
http://www.smashingmagazine.co...
How to log something in Rails in an independent log file?
... class from within your rails app, i.e. anywhere you could do Post.create(:title => "Hello world", :contents => "Lorum ipsum"); or something similar you can log to your custom file like this
MyLog.debug "Hello world"
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How do I load a file into the python console?
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From the man page:
-i When a script is passed as first argument or the -c option is used, enter interactive mode after executing the script or the command. It does not read the $PYTHONSTARTUP file. This can be useful to inspect global variables or a st...
Redirect all output to file [duplicate]
... convenience extension (it originally comes from csh). In a portable shell script (and if you don't need portability, why are you writing a shell script?), use > file 2>&1 only.
– zwol
Aug 10 '13 at 20:50
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How to check if a string is a valid JSON string in JavaScript without using Try/Catch
...ething that doesn't use try/catch. The question is edited along with a new title. Sorry about that.
– Chi Chan
Sep 14 '10 at 15:26
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How can I make git ignore future revisions to a file?
... think the solution is indeed to do something like this, preferably with a script executed whenever you pull or clone. One idea would be that anything with a particular extension (say .basefile) gets copied to a file with the extension dropped and then the file name gets added to .gitignore in that...
Call Javascript function from URL/address bar
Is it possible to call a javascript function from the URL? I am basically trying to leverage JS methods in a page I don't have access to the source.
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How to retrieve a module's path?
...nswers how to get the path of the module you import, but not of the module/script you are in (for the script you're running, __file__ is not a full path, it is relative). For the file I'm in I had to import another module from the same directory and do as shown here. Does anyone know a more convenie...