Question

Write a function called backwards which takes two parameters. The first is a file object that has already been opened in read mode called essayfile. The second is called filename, which contains the filename for the output file that will need to be properly opened and closed in your function. The function should read from already opened file object line by line. Each line in the file should have the words on the line reversed. For example, "This is a Test!" becomes "Test! a is This". Each new line that has been altered should be written out to an output file that has been properly opened using the filename parameter within your function.

python program please

Answer 1

1. As asked in the question that to implement a Python function named as backwards where it is required to read a file line by line and write each line in a file should have the words in reversed order.

2. As per requirement, a complete program has been written with the function and few lines are written for testing in a file named as backwards_demo.py and the file is saved at D:/.

3. Please find below backwards_demo.py file screenshot including comments:-

B backwards.py #Defining function backwards which is taking essayfile object of File type and the filename in which data need to be written 2 def backwards (essayfile, filename) : #Creating a writeFile object with the filename writeFile = open(filename, "w") #Iterating over each line of the essayfile for line in essayfile: WNHO COUAWN H HHHH #Splitting each word of the line and storing it into the wordsList wordsList=line.split() #Then iterating over each word of the wordsList from the end #as the index is given -1 i.e. read from the end of the file for word in wordsList[::-1]: writeFile.write (word+' ') #writing word to the file #Write a new line into the file after reading each word of the line writeFile.write("\n') #closing writeFile object writeFile.close() N N N N N N N H JUAWNO #End of the backwards function #Below three lines are written to test the functionality of the backwards function #Below line is creating a essayfile object to read the data from the file named as essay.txt

essayfile = open('essay.txt',"r") 000 ON #calling backwards function with the essayfile file type object and the file name output.txt in which #the output should be written backwards (essayfile, "output.txt') w w #closing the essayFile object essayfile.close() in w

4. Please find below backwards_demo.py file in text form including comments:-

#Defining function backwards which is taking essayfile object of File type and the filename in which data need to be written
def backwards(essayfile, filename):

   #Creating a writeFile object with the filename
   writeFile = open(filename, "w")
  
   #Iterating over each line of the essayfile
   for line in essayfile:
      
       #Splitting each word of the line and storing it into the wordsList
       wordsList=line.split()
      
       #Then iterating over each word of the wordsList from the end
       #as the index is given -1 i.e. read from the end of the file
       for word in wordsList[::-1]:
           writeFile.write(word+' ') #writing word to the file

       #Write a new line into the file after reading each word of the line
       writeFile.write('\n')
  
   #Closing writeFile object
   writeFile.close()

#End of the backwards function

#Below three lines are written to test the functionality of the backwards function
#Below line is creating a essayfile object to read the data from the file named as essay.txt
essayfile = open('essay.txt',"r")
          
#Calling backwards function with the essayfile file type object and the file name output.txt in which
#the output should be written
backwards(essayfile, 'output.txt')

#Closing the essayFile object
essayfile.close()

5. Please note that the last three lines are written in the above program is just for testing purpose only where the input and output file names are specified with the backwards function call. Input file name is essay.txt and output file name is output.txt.

6. Please fine below contents of essay.txt given as input:-

essay but This is a Test! 2 It works perfectly fine. 3 The life is beautiful. 4 It gives us lot of opportunity. 5 I am greatful to have a beautiful life.

7. Please fine below contents of output.txt after executing above program:-

Boutput.txt x 1 Test! a is This fine. perfectly works It 3 beautiful. is life The 4 opportunity. of lot us gives It 5 life. beautiful a have to greatful am I

It is clearly visible from the above two screenshots that each line of essay.txt has been reversed with the words. This is what the we are expecting from our program.

8. Please find below screenshot showing how the above program is executed at D:/:-

D:\>python backwards_demo .py D:\>

9. Important part of the code is marked in bold.

10. Though the complete program is implemented as per instructions mentioned in the question. Still if you face any difficulty while executing this code or any part of the explanation, you can feel free to post your query in comments section. I will reply as soon as possible with utmost importance.

11. Please rate positive if you like my solution.

Have a nice day.