Lecture 13 — Exercises¶
Solutions to the problems below must be sent to Submitty for grading. A separate file must submitted for each problem. Solutions must be submitted by 4 pm on Tuesday, October 18.
Given the file
Location 2000 2011 New York State 18,976,811 19,378,102 New York City 8,008,686 8,175,133
What is the output of the following code? (Note: there is no blank line after the New York City line.)
f = open("census_data.txt") line1 = f.readline() line1 = line1.strip() line2 = f.read() line3 = f.readline() print(line1) print(line2) print(line3) f.close() f = open("census_data.txt") s = f.read() line_list = s.split('\n') print(len(line_list)) line_list = s.strip().split('\n') print(len(line_list))
Submit your output as a text file.
Given a file containing test scores, one per line, we want to have a new file that contains the scores in increasing order. To do this, write a Python program that asks the user for two file name strings, one for the input scores and the second for the output, scored scores. The program should open the first file (to read), read the scores, sort them, open the second file (to write), and output to this file the score in increasing order. There should be one score per line, with the index on each line.
As an example, support the input file is
scores.txtand it contains
75 98 75 100 21 66 83 15
then running your program should look like (in Wing IDE):
Enter the scores file: scores.txt scores.txt Enter the output file: scores_sorted.txt scores_sorted.txt
When you look at the contents of
scores_sorted.txtyou should see
0: 15 1: 21 2: 66 3: 75 4: 75 5: 83 6: 98 7: 100
(Output the indices using two integer spaces and the scores using three.) You only need to submit the Python file. We will test with the example above and with a new file you have not seen.