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When eager evaluation is desirable (primarily when the sequence is finite, as otherwise evaluation will never terminate), one can either convert to a [[List (abstract data type)|list]], or use a parallel construction that creates a list instead of a generator. For example, in Python a generator <code>g</code> can be evaluated to a list <code>l</code> via <code>l = list(g)</code>, while in F# the [[sequence expression]] <code>seq { ... }</code> evaluates lazily (a generator or sequence) but <code>[ ... ]</code> evaluates eagerly (a list).
In the presence of generators, loop constructs of a language – such as for and while – can be reduced into a single loop ... end loop construct; all the usual loop constructs can then be comfortably simulated by using suitable generators in the right way. For example, a ranged loop like <code>for x = 1 to 10</code> can be implemented as iteration through a generator, as in Python's <code>for x in xrange(
==Timeline==
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