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So the body gets executed. The print statement displays the value of i on the screen. The next statement is: i = i + 1 You should read this as: i assigned to i plus 1. The logic is: New value of i is old value of i plus one. So, the value of i becomes 1. Python once again checks the condition - it’s true (because 1 is less than 5). So the body gets executed again. The value of i is printed(this time, the value is 1). The next statement(i = i + 1) changes the value of i to 2. The condition gets checked once more.

The use of the names guess and x makes the code more readable. Note the way we are using one function to build another (improve makes use of average). 001. We use this idea to define a boolean function called good_enough which checks whether its parameter guess is good enough to be the square root of x: >>> from math import * >>> def good_enough(guess, x): ... d = abs(guess*guess - x) ... 001) ... 0, 16) True >>> The import statement is required because we are using a function called abs which is defined in the math library.

The function is next to useless without the return. There is another aspect of return which the following function illustrates: >>> def silly(a): ... m = a + 1 ... return m ... n = a - 1 ... return n ... >>> silly(10) 11 >>> silly(23) 24 >>> We have used two return statements in the body of the function. The result of calling silly(10) is 11 and silly(23) is 24; this means that the two lines written after the return m have no effect at all. So, the big idea here is: Your function effectively stops executing after the first return.

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