write a python program

Question

Consider the following formula and evaluate the y value for the range of t values found in a file with format 𝑦(𝑡) = 𝑣0𝑡 − 0.5𝑔𝑡

File Format:

v0 3.0

t:

0.15592 0.28075 0.36807889 0.35 0.57681501876 0.21342619 0.0519085 0.042 0.27 0.50620017 0.528 0.2094294 0.1117 0.53012 0.3729850 0.39325246 0.21385894 0.3464815 0.57982969 0.10262264 0.29584013 0.17383923

i. Write a function that reads the input file and returns v0 and a list with the t values.

ii. Write a function that creates a file with two nicely formatted columns containing the t values to the left and the corresponding y values to the right. Let the t values appear in increasing order (note that the input file does not necessarily have the t values sorted).

iii. Make a test function that generates an input file, calls the function for reading the file, and checks that the returned data objects are correct.

iv. Write a function which handle the exception handling for the availability of file or not.

Answer 1

# Solution

#i. Writing a function to read the input file

def read_input_file():

   try:

       file = open('input.txt', 'r')

       line = file.readlines()

       v0 = float(line[0].split(' ')[1])

       t_list = []

       for i in range(2, len(line)):

           t_list.append(float(line[i]))

       file.close()

       return v0, t_list

   except FileNotFoundError:

       print('File not found!')

# ii. Writing a function to create a file with two nicely formatted columns

def create_file(v0, t_list):

   try:

       file = open('output.txt', 'w')

       t_list.sort()

       for t in t_list:

           y = v0*t - 0.5*9.81*t*t

           file.write(str(t) + "\t\t" + str(y) + "\n")

       file.close()

       return

   except FileNotFoundError:

       print('File not found!')

# iii. Writing a test function

def test_function():

   v0 = 3.0

   t_list = [0.15592, 0.28075, 0.36807889, 0.35, 0.57681501876, 0.21342619, 0.0519085, 0.042, 0.27, 0.50620017, 0.528, 0.2094294, 0.1117, 0.53012, 0.3729850, 0.39325246, 0.21385894, 0.3464815, 0.57982969, 0.10262264, 0.29584013, 0.17383923]

   v0_read, t_list_read = read_input_file()

   if (v0 == v0_read) and (t_list == t_list_read):

       print('Test Passed!')

   else:

       print('Test Failed!')

# iv. Writing a function for handling exceptions

def exception_handling():

   try:

       file = open('input.txt', 'r')

   except FileNotFoundError:

       print('File not found!')

# Calling the test function

test_function()