Question

Python Programming

Topics: list, file input/output

You will write a program that allows the user to read grade data from a text file, view computed statistical values based on the data, and to save the computed statistics to a text file. You will use a list to store the data read in, and for computing the statistics. You must use functions.

The data:

The user has the option to load a data file. The data consists of integer values representing student grades in a class. The value ranges from 0 to 100. The data is stored in a text file with each value separated by a white space. You may assume that that number of data points in the file will never exceed 1,000.

Descriptive Statistics:

The user has the option to compute statistics on the grade data. Your program will compute the following values:

• Min - the lowest value in the data
• Max     -the highest value in the data
• Mean   - the average value
• Median – the middle value of the sorted values

To compute the median, you must first sort the data. When the data size is odd, there’s only one middle value to pick from as the median. When the data size is even, there are two middle values and you can pick either one as the median.

Saving result:

The user has the option to save the statistics to a file. Your program will save the descriptive statistics result to a text file, each value per line. The format as in the sample below:

Min      = 35

Max      = 100

Mean = 79

Median     = 73

Grading:

Points are assigned to different part of the program.

Reading the input file              2 points

Sorting the data                        1 point

Min, Max, Mean, Median     4 point

Saving output file                     2 points

Comments/Style                       1 point

Submission:

You must zip your program and upload in the usual way.If you submit an unzipped file, you will lose 1 point.

Sample run:

Choose an option:

1. Load data

2. Display computed statistics

3. Save computed statistics

4. Exit

Choice: 1

Enter the name of the file: data.txt

Data read successfully.

Choose an option:

1. Load data

2. Display computed statistics

3. Save computed statistics

4. Exit

Choice: 2

Below are the compute values:

Min       = 35

Max       = 100

Mean = 79.3

Median      = 73

Choose an option:

1. Load data

2. Display computed statistics

3. Save computed statistics

4. Exit

Choice: 3

Enter the name of the file: data-stats.txt

Result saved successful.

Choose an option:

1. Load data

2. Display computed statistics

3. Save computed statistics

4. Exit

Choice: 4

Goodbye!

Answer 1

print("\nChoose an option:\n1.Load data\n2.Display computed statistics\n3.save computed statistics\n4.Exit")
op=int(input("Choice: ")) #option
count=0
l=[] #list to store data
while (op!=4): #if option is not 4
   if op==1: #if option is 1
       file_name=input("\nEnter the name of the file: ")
       fp1=open(file_name,"r") #opening file in read mode
       for line in fp1: #iterates throgh each line in file
           for i in line.split(" "): #iterates through each number by splitting the line
               l.append(int(i)) #adding number to list
       print("Data read successfully\n\n")
   elif op==2: #if option is 2
       if (len(l)>0): #if length of the list is greater than 0
           mn=101
           mx=-1
           sm=0
           count=0
           for i in l: #iterates through each number in list
               if i<mn: #if the number is less than mn(minimum)
                   mn=i
               if i>mx: #if the number is greater than mx(maximum)
                   mx=i
               sm+=i #sum
               count+=1 #count
           mean=sm/count
           for i in range(0,len(l)): #sorting
               for j in range(i,len(l)):
                   if l[i]>l[j]:
                       t=l[i]
                       l[i]=l[j]
                       l[j]=t
           median=l[int(len(l)/2)+1] #median
           print("Min=",mn,"\nMax=",mx,"\nMean=",mean,"\nMedian=",median,"\n")
       else:
           print("\nchoose 1 to load file\n")
   elif op==3:
       if (len(l)>0 and count!=0):
           file_name=input("Enter the name of the file: ")
           string="Min = "+str(mn)+"\nMax = "+str(mx)+"\nMean = "+str(mean)+"\nMedian = "+str(median) #making a string from statistics
           fp2=open(file_name,"a") #opening file in append mode
           fp2.write(str(string)) #writing into file
       else:
           print("\n\nChoose 1 and 2 to load file and compute statistics")
   print("Choose an option:\n1.Load data\n2.Display computed statistics\n3.save computed statistics\n4.Exit")
   op=int(input("Choice: ")) #taking choice
print("Goodbye!")