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if found:print 'at index', ielse:print X, 'not found'C:\book\tests> python power.pyat index 5As is, the example doesn’t follow normal Python coding techniques. Follow thesteps outlined here to improve it (for all the transformations, you may type yourcode interactively, or store it in a script file run from the system command line—using a file makes this exercise much easier):a. First, rewrite this code with a while loop else clause to eliminate the foundflag and final if statement.b. Next, rewrite the example to use a for loop with an else clause, to eliminatethe explicit list-indexing logic. Hint: to get the index of an item, use thelist index method (L.index(X) returns the offset of the first X in list L).c. Next, remove the loop completely by rewriting the example with a simple inoperator membership expression. (See Chapter 8 for more details, or typethis to test: 2 in [1,2,3].)d. Finally, use a for loop and the list append method to generate the powers-of-2 list (L) instead of hardcoding a list literal.Deeper thoughts:e. Do you think it would improve performance to move the 2**Xexpressionoutside the loops? How would you code that?f. As we saw in exercise 1, Python includes a map(function, list) tool that cangenerate the powers-of-2 list, too: map(lambda x: 2 ** x, range(7)). Try typingthis code interactively; we’ll meet lambda more formally in Chapter 17.296 | Chapter 14: The Documentation Interlude