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Determine if variable is defined in Python [duplicate]
...re-read Joel's 9-years-old essay joelonsoftware.com/articles/fog0000000069.html .
– Alex Martelli
Oct 20 '09 at 14:51
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Error installing mysql2: Failed to build gem native extension
...w rails app
rails new world
Delete the file c:\Sites\world\public\index.html
Edit the file c:\Sites\world\config\routes.rb
add this line -> root :to => 'cities#index'
Open command prompt (generate views and controllers)
rails generate scaffold city ID:integer Name:string CountryCode:strin...
How to Sign an Already Compiled Apk
... on the details: http://developer.android.com/guide/publishing/app-signing.html
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Undoing a 'git push'
...ert' instead:
http://www.kernel.org/pub/software/scm/git/docs/user-manual.html#fixing-mistakes
https://git-scm.com/book/be/v2/Git-Basics-Undoing-Things
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partial string formatting
...field names to whatever you wanted:
http://docs.python.org/library/string.html#string.Formatter.get_value
For instance, you could map bar to "{bar}" if bar isn't in the kwargs.
However, that requires using the format() method of your Formatter object, not the string's format() method.
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How to append to a file in Node?
...ase, use fs.createWriteStream instead. Read nodejs.org/docs/v0.4.8/api/all.html#fs.write
– angry kiwi
Jun 27 '11 at 9:33
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Regex to validate password strength
...urself to catastrophic backtracking (regular-expressions.info/catastrophic.html). This can go unnoticed until one day your server hangs with 100% CPU because a user used a "strange" password. Example: ^([a-z0-9]+){8,}$ (can you see the error?)
– aKzenT
Sep 22 '...
Cross-Origin Request Headers(CORS) with PHP headers
...d.php or where you would send your request (for example if you have upload.html and you need to attach the files to upload.php, then copy and paste these 4 lines).
Also if you're using CORS plugins/addons in chrome/mozilla be sure to toggle them more than one time,in order for CORS to be enabled
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Espresso: Thread.sleep( );
... as unnecessary. More info here: developer.android.com/tools/help/proguard.html#keep-code
– MattMatt
Apr 26 '16 at 9:24
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What's the fastest way to delete a large folder in Windows?
...chlemeil the Painter' algorithm (joelonsoftware.com/articles/fog0000000319.html) anytime a dir or del is done
– warren
Oct 9 '08 at 11:36
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