Which of the languages described in Section XXXXXXXXXXuses indentation to control syntactic grouping? List several distinctive features of Python. Describe, briefly, how Ruby uses blocks and...

Which of the languages described in Section 14.2.4 uses indentation to control syntactic grouping? List several distinctive features of Python. Describe, briefly, how Ruby uses blocks and iterators. What capabilities must a scripting language provide in order to be used for extension? Name several commercial tools that use extension languages.