Question

In python

def lambda_1(filename):
# Complete this function to read grades from `filename` and find the minimum
# student test averages. File has student_name, test1_score, test2_score,
# test3_score, test4_score, test5_score. This function must use a lambda
# function and use the min() function to find the student with the minimum
# test average. The input to the min function should be
# a list of lines. Ex. ['student1,33,34,35,36,45', 'student2,33,34,35,36,75']
# input filename
# output: (lambda_func, line_with_min_student) -- example (lambda_func, 'student1,33,34,35,36,45')

# YOUR CODE HERE
raise NotImplementedError()

This is an example of the file

student1,94,88,86,78,94

student2,88,78,80,84,80

student3,84,97,85,73,76

student4,72,99,72,86,82

student5,71,92,71,77,91

Answer 1

The following program does the required tasks. Read the comments to understand.

#Lambda function to be implemented
def lambda_1(filename):
    f1 = open(filename,"r")
    #list of lines
    students = f1.readlines()
    #A lambda function to calculate average for each line
    lambda_func = lambda x : sum(list(map(int,x.split(",")[1:])))/5
    #min function using the lambda function to find the minimum value
    st = min(students, key=lambda_func)
    #The output to be returned
    return (lambda_func, st)

print(lambda_1("inp.txt"))
    

inp.txt:

student1,94,88,86,78,94
student2,88,78,80,84,80
student3,84,97,85,73,76
student4,72,99,72,86,82
student5,71,92,71,77,91

Output:

(<function lambda_1.<locals>.<lambda> at 0x00000254EDD47790>, 'student5,71,92,71,77,91')

The min function returns the minimum element for which the value of lambda(average) is minimum.