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In Perl, foreach (which is equivalent to the shorter for) can be used to traverse elements of a list. The expression which denotes the collection to loop over is evaluated in list-context and each item of the resulting list is, in turn, aliased to the loop variable.
Python uses the following syntax to express list comprehensions over finite lists: S = [ 2 * x for x in range ( 100 ) if x ** 2 > 3 ] A generator expression may be used in Python versions >= 2.4 which gives lazy evaluation over its input, and can be used with generators to iterate over 'infinite' input such as the count generator function which ...
Ignoring the need for declaring and initializing variables, the COBOL equivalent of a for-loop would be. PERFORM SQ-ROUTINE VARYING I FROM 1 BY 1 UNTIL I > 1000 SQ-ROUTINE ADD I ** 2 TO SUM-SQ . In the 1980s, the addition of in-line loops and structured programming statements such as END-PERFORM resulted in a for -loop with a more familiar ...
The user can search for elements in an associative array, and delete elements from the array. The following shows how multi-dimensional associative arrays can be simulated in standard AWK using concatenation and the built-in string-separator variable SUBSEP:
Python. The use of the triple-quotes to comment-out lines of source, does not actually form a comment. [19] The enclosed text becomes a string literal, which Python usually ignores (except when it is the first statement in the body of a module, class or function; see docstring). Elixir
This comparison of programming languages compares how object-oriented programming languages such as C++, Java, Smalltalk, Object Pascal, Perl, Python, and others manipulate data structures. Object construction and destruction
(The previous statement applies to Python 3.x. In Python 2.x, the next() method is equivalent.) A StopIteration exception will be raised when no more elements are left. The following example shows an equivalent iteration over a sequence using explicit iterators:
Python: strong implicit (with optional explicit typing as of 3.5) nominal dynamic R: implicit dynamic Raku: partially implicit [TS 7] dynamic with optional static typing REBOL: strong implicit dynamic Rexx: typeless —, implicit wrt numbers — static+dynamic wrt numbers RPG: weak static Ruby: strong implicit — dynamic Rust: strong