Unless there is an overwhelming need to create a mess of variable names, I would just use a dictionary, where you can dynamically create the key names and associate a value to each. a = {} k = 0 while k < 10: # dynamically create key key = … # calculate value value = … Read more
Wrap them in {}: ${“file” . $i} = file($filelist[$i]); Working Example Using ${} is a way to create dynamic variables, simple example: ${‘a’ . ‘b’} = ‘hello there’; echo $ab; // hello there
property_exists( mixed $class , string $property ) if (property_exists($ob, ‘a’)) isset( mixed $var [, mixed $… ] ) NOTE : Mind that isset() will return false if property is null if (isset($ob->a)) Example 1: $ob->a = null var_dump(isset($ob->a)); // false Example 2: class Foo { public $bar = null; } $foo = new Foo(); var_dump(property_exists($foo, … Read more
You can use the typeid operator: #include <typeinfo> … cout << typeid(variable).name() << endl;
As unwind said, this isn’t really something you do in Python – variables are actually name mappings to objects. However, here’s one way to try and do it: >>> a = 1 >>> for k, v in list(locals().iteritems()): if v is a: a_as_str = k >>> a_as_str a >>> type(a_as_str) ‘str’
HTML / HTTP is stateless, in other words, what you did / saw on the previous page, is completely unconnected with the current page. Except if you use something like sessions, cookies or GET / POST variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More … Read more
It used to be generally recommended best practice1 to use pass by const ref for all types, except for builtin types (char, int, double, etc.), for iterators and for function objects (lambdas, classes deriving from std::*_function). This was especially true before the existence of move semantics. The reason is simple: if you passed by value, … Read more
To split a string separated by -, you can use read with IFS: $ IFS=- read -r var1 var2 <<< ABCDE-123456 $ echo “$var1” ABCDE $ echo “$var2” 123456 Edit: Here is how you can read each individual character into array elements: $ read -ra foo <<<“$(echo “ABCDE-123456″ | sed ‘s/./& /g’)” Dump the array: … Read more
It would be neater to capture the error file thus: ERROR=$(</tmp/Error) The shell recognizes this and doesn’t have to run ‘cat‘ to get the data. The bigger question is hard. I don’t think there’s an easy way to do it. You’d have to build the entire pipeline into the sub-shell, eventually sending its final standard … Read more
Table variable declare @listOfIDs table (id int); insert @listOfIDs(id) values(1),(2),(3); select * from TabA where TabA.ID in (select id from @listOfIDs) or declare @listOfIDs varchar(1000); SET @listOfIDs=”,1,2,3,”; –in this solution need put coma on begin and end select * from TabA where charindex(‘,’ + CAST(TabA.ID as nvarchar(20)) + ‘,’, @listOfIDs) > 0