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 census_data.txt:

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.txt and 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.txt you 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.