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How to escape special characters in building a JSON string?

...nonsense; strings in JSON can only ever be double-quoted. Try JSON.parse("'foo'") in your browser console, for example, and observe the SyntaxError: Unexpected token '. The JSON spec is really simple and clear about this. There is no escape sequence in JSON for single quotes, and a JSON string canno...
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Creating a singleton in Python

... class Foo(object): pass some_global_variable = Foo() Modules are imported only once, everything else is overthinking. Don't use singletons and try not to use globals. ...
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How to remove leading and trailing whitespace in a MySQL field?

... You're looking for TRIM. UPDATE FOO set FIELD2 = TRIM(FIELD2); share | improve this answer | follow | ...
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In-place edits with sed on OS X

...native way is to use built-in substitution in Vim Ex mode, like: $ ex +%s/foo/bar/g -scwq file.txt and for multiple-files: $ ex +'bufdo!%s/foo/bar/g' -scxa *.* To edit all files recursively you can use **/*.* if shell supports that (enable by shopt -s globstar). Another way is to use gawk a...
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MySQL/SQL: Group by date only on a Datetime column

... Cast the datetime to a date, then GROUP BY using this syntax: SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate); Or you can GROUP BY the alias as @orlandu63 suggested: SELECT SUM(foo), DATE(mydate) DateOnly FROM a_table GROUP BY DateOnly; Though I don't think it'll make...
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Reference: Comparing PHP's print and echo

...equence: <?php function bar( $baz ) { // other code } function foo() { return print("In and out ...\n"); } if ( foo() ) { bar(); } You might find print of particular value when it comes to debugging on the fly, as the next example illustrates: <?php $haystack = 'abcde'; $n...
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How to get the concrete class name as a string? [duplicate]

... Is there a way to get it with the import path? For example, str(type(foo)) == "<class 'never.gonna.give.youup'>" but type(foo).__name__ == "youup". How do I get never.gonna.give.youup? – Martin Thoma Apr 29 '19 at 8:00 ...
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C# generics syntax for multiple type parameter constraints [duplicate]

... void foo<TOne, TTwo>() where TOne : BaseOne where TTwo : BaseTwo More info here: http://msdn.microsoft.com/en-us/library/d5x73970.aspx shar...
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Python-equivalent of short-form “if” in C++ [duplicate]

... While a = 'foo' if True else 'bar' is the more modern way of doing the ternary if statement (python 2.5+), a 1-to-1 equivalent of your version might be: a = (b == True and "123" or "456" ) ... which in python should be shortened to: ...
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“Parameter” vs “Argument” [duplicate]

...pression used when calling the method. Consider the following code: void Foo(int i, float f) { // Do things } void Bar() { int anInt = 1; Foo(anInt, 2.0); } Here i and f are the parameters, and anInt and 2.0 are the arguments. ...