Not understanding how to do itExercise -- Open Lab 10 The Grading Problem Part 2 w/Lists Due: June...

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Not understanding how to do itExercise -- Open Lab 10  The Grading Problem Part 2 w/Lists  Due: June 24, 2021 11:59pm (midnight)  Note: This is due by midnight (11:59pm). Submissions after the deadline CANNOT BE accepted! Learning Objectives  This assignment is meant to test your understanding of lists. If you have done your reading, you  already know almost everything there is to know about lists. The following problem is like what you  might be asked on the final exam. Working completely alone (although you can ask the instructor  questions, as always), test your knowledge. Background  Write a complete Python program that reads an unknown number of floating-point numbers  from the file grades.dat. This does mean that you need to open the file. Do NOT ask the user to enter a  filename. Open the file explicitly. First, read all the grades into a list structure. Then calculate   1. the number of total grades in the list,   2. the sum of the grades,   3. the average of the grades  4. the percentage for each letter grade of the whole.  Next output, the total number of grades. The output the percentage of each letter grade followed by all  grades that are within that letter grade. (See the sample output below for reference). All values aside  from the total count should be formatted as floating-point values with one decimal place precision and  the rightmost digit of all numeric values should line up in the output.  IMPLEMENTATION NOTES  1. Use as your source file name “newgrader.py”.  2. This will be a short program.   3. You do not need to define any functions other than main().   4. You may assume the input data will have no errors and will not need to be checked for them.   5. The input data file should be read only once into a LIST!   6. You are NOT allowed to open the input file a second time NOR rewind the file in some way.   7. Output is to standard output (stdout i.e. use print()).  8. The file you open must be called grades.dat (see the Submission information below for how to  run/test your program)  9. Your output MUST match EXACTLY.  Your program should not crash if the file is empty. SAMPLE INPUT  Three sample input data files are provided for you to test your program: grades1.txt, grades2.txt, and  grades3.txt. These can be copied from $PUB in the same manner you have been (use past assignments  for reference). Note: grades3.txt is an empty file. The summary information should be printed with all  0’s as values and the average would be 0.0%  The file grades2.txt looks like:  81  95  74  61  59  There are only 5 grades in the file with one grade per line. Before running your program, you should  copy the sample datafile and rename it to grades.dat. For example:  $cp $PUB/grades2.txt grades.dat  EXAMPLE OUTPUT  The sample output below is what your output should look like given the sample input file above  (grades2.txt copied as grades.dat). Your output must be spaced, labeled, punctuated, and formatted  EXACTLY as shown. Double check that your numeric values line up as shown in the sample output and everything is spelled  correctly!  Submission  You are to electronically submit the source program, a source program listing, and the execution  results obtained from running your program against provided percentage.dat file (see above). Once you  have a working program, the following UNIX commands will do what is required:   $ script ola10.log  $ cat -n newgrader.py  $ cp $PUB/grades1.txt grades.dat  $ python3 newgrader.py  $ cp $PUB/grades2.txt grades.dat  $ python3 newgrader.py  $ cp $PUB/grades3.txt grades.dat  $ python3 newgrader.py  $ exit  $ handin ola10 newgrader.py ola10.log  Reminder  You should work alone on this assignment; neither offer nor accept any additional help,  except on a one-to-one basis with the instructor or TA.  Grading  In addition to examining your source code and the execution results obtained by running your  program against the test file(s) provided above, the grader may run your program against some  additional (and unknown to you) data sets. Your program MUST work properly for ANY valid input to be  considered correct.

Pratap · Accepted Answer

"""
Grader Program
"""
def main():
    """
    Main function
    :return: None
    """
    try:
        file = open('grades.dat', 'r')     # open the file
        data = []                           # create empty list
        file_data = file.readlines()        # store all lines as list
        if len(file_data) == 0:             # if file is empty
            empty_flag = True               # set empty flag as True
            data = [0] * 5                  # create list of zeroes
            total_grades = 0                # set total number of grades to zero
        else:                               # if file is not empty
            empty_flag = False              # set empty flag to False
            for line in file_data:          # iterate through each line
                # convert the line content to floating number
                data.append(float(line.strip()))
            total_grades = len(data)        # set total grades
        data.sort(reverse=True)             # sort the data in descending
        file.close()                        # close the file
        # get the sum of all grades
        sum_grades = round(float(sum(data)), 2)
        try:
            # get the average of grades
            avg_grades = sum_grades / total_grades
        except ZeroDivisionError:
            # set average to 0 while the grades are zero
            avg_grades = 0.0
        letter_count = [0] * 5              # initialize the letter count A,B,C,D,F
        for i in data:                      # iterate through all grades
            if i >= 90:

Exercise -- Open Lab 10 The Grading Problem Part 2 w/Lists Due: June 24, XXXXXXXXXX:59pm (midnight) Note: This is due by midnight (11:59pm). Submissions after the deadline CANNOT BE accepted! Learning...

Answer To: Exercise -- Open Lab 10 The Grading Problem Part 2 w/Lists Due: June 24, XXXXXXXXXX:59pm (midnight)...

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