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Notes7

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  • 1. Page 1 6.189 –Homework ONLY Session 7 Administrivia Name: Instructions: 1. Err..complete the questions :). 2. When we ask for output, you DON'T have to write the spaces/newlines in. Program Text: print “X”, print “X”, Output: XX Day 4: More Loop Practice Problem 20: Each of the following function definitions takes a list as a parameter and solves a specific problem. Correctly fill the blanks in the following code to solve the problems. There is a way to solve each problem by only filling in the blanks. Don’t just add extra lines to force a solution. Also, there may even be more elegant solutions that don’t use all the blanks – feel free to use those too. Program Text: def swap_first_last(my_list): """This function swaps the first and last elements in a list. It has no return value.""" temp = _____________ _____________ = _____________ _____________ = _____________
  • 2. Page 2 Program Text: def second_biggest(my_list): """This function returns the second biggest element in my_list. It assumes that my_list contains distinct, positive integers.""" second_biggest = -5 biggest = -1 for i in my_list: if i > _____________: second_biggest = ______________ biggest = _____________________ elif i > second_biggest: second_biggest = ______________ return second_biggest Problem 13: You may recall the notion of a power series from Calculus. A power series is an infinite polynomial series that approximation a continuous function. For example, the power series of sin(x) is 3! 5! 7! The more terms you calculate, the closer your expression will be to sin(x) – hence the reason we call it an approximation. Write a function to calculate sin(x) using the above power series (well, fill in the blanks, at least.) Note: You've already seen the code for a function that can calculate the factorial of a number (Problem 11.) Assume the existance of a factorial(x) function that calculates the factorial of x.
  • 3. Page 3 Program Text: def calculate_sin(x, number_of_terms): "Calculates the value of sin(x) using the power series." number_of_terms = min(20, number_of_terms) #do at most 20 terms sin_value = 0 for i in range(number_of_terms): new_term = x ** _____________ new_term /= factorial(___________________) new_term *= (-1) ** ___________________ sin_value += new_term return sin_value