Question

Write a program that computes and prints the average of numbers in a text file. I created a text file integers.txt that has the numbers 5,4,3,2,1.

I need to define the average function

Define the main function which will include the following things

1. prompt user for input of text file name

2. open and read input file, can be done before or inside high order functions

3. use two high order functions

4.calculate and display averages and original ist

5. call the main

6. exit the program

Here is what i have so far:

#Write a program that computes and prints the average of numbers in a text file."

import functools
#define average functions
def average(numbers):
"""returns the average of the numbers in list"""
if len(numbers) == 0:
return 0
#Find the total sum and return the average
theSum = 0
for number in numbers:
theSum += number
return theSum/ len(numbers)

#define main
def main():
#prompt user input of text file name
filename = input("Enter a file name: ")

#open and read input file
file = open(filename, "r")
filename = file.read().split()
  
#convert list into integers
file = list(map(int,file))
  
  
#calculate and display average(s) and display original list
print(average(numbers))
  
#call main
if __name__ == "__main__" :
main()

Am i on the right path? I always get hung up on calling the function in the main. Please help me understand this process better. Thanks

Answer 1

from functools import reduce

def getNumberList(filename):

f = open(filename,'r')

line = f.readline()

numbers = line.split(',')#split the numbers separated by comma

#higher order function to convers string data into integer

numberList = list(map(lambda x : int(x),numbers))

return numberList

def getAverage(numbers):

#higher order function reduce to find the sum of elements

sum = reduce(lambda x, y: x + y, numbers)

average = sum/len(numbers)

return average

def main():

#take input from the user

filename = input("Enter filename : ")

#get the numbers from the file

numbers = getNumberList(filename)

#get the average from the numbers list

average = getAverage(numbers)

#display the average

print(average)

if __name__ == "__main__":

main()

(Pratyushs-MacBook-Pro:python pthapli$ python3 test.py Enter filename : integers.txt 3.0 Pratyushs-MacBook-Pro:python pthaplis | integers.txt 1,2,3,4,5

1 2 3 4 5 6 def getNumberList(filename): f = open(filename, 'r') line = f.readline() numbers line.split(',')#split the numbers separated by comma numberlist []#holds the integer value for i in numbers: numberList.append(int(i)) 7 8 9 return numberlist 10 11 12 13 14 15 16 17 def getAverage (numbers): sum = 0#stores the sum of the numbers in the list count = O#keeps the count of numbers in the list for i in numbers: sum = sum + i count = count + 1 18 average = sum/count#calculate the average return average 19 20 21 22 23 24 25 26 27 28 29 30 def main(): #take input from the user filename input("Enter filename: ") #get the numbers from the file numbers = getNumberList(filename) #get the average from the numbers list average = getAverage(numbers) #display the average print(average) 31 IL if _main_": 32 33 34 _name main()