Refactoring in Python

Questions 1 to 5 of 6

1. 1. Put the steps for one refactoring step in the order you do them.

   Use the arrows to put the steps in order.

   1. 1.Save the output to a file↑↓
   2. 2.Compare the new output with the saved reference using diff↑↓
   3. 3.Run the script, so Python reads the whole file and shows any indentation or name errors↑↓
   4. 4.Make one small change, such as moving one block of lines into a function↑↓
2. 2. Put these steps for pulling the marks loop out of the main part of the program into sum_of in the correct order.

   Use the arrows to put the steps in order.

   1. 1.In the main loop, replace the inner for loop with the call total = sum_of(scores[i])↑↓
   2. 2.Run the program and save its output↑↓
   3. 3.Compare the new output with the saved reference using diff↑↓
   4. 4.Write def sum_of(marks): with the loop, and return total↑↓
3. 3. After the marks loop moves into sum_of, why does the row loop still need total? ``python total = sum_of(scores[i]) average = total / len(scores[i]) # ... later in the same loop ... class_total = class_total + total ``

   Python requires every name to be declared at the top of the functionThe class_total line still uses total later in the row loopsum_of cannot return an int, so total must be set firstThe print line needs total as its argument
4. 4. What does this program print? ``python def letter_grade(average): if average >= 90: return "A" elif average >= 80: return "B" elif average >= 70: return "C" elif average >= 60: return "D" print(letter_grade(95), letter_grade(55)) ``

   A NoneA FAAn error: missing return statement
5. 5. This function should return True when a grade is not F. What is wrong with it? ``python def is_passing(grade): return grade == "F" ``

   It should compare with the lowercase text "f"It should return 1 instead of TrueThe test is inverted: it returns True for F, so it should be grade != "F"Text values must be compared with is instead of ==