Question

Python 3.7 Coding assignment

This Program should first tell users that this is a word analysis software. For any user-given text file, the program will read, analyze, and write each word with the line numbers where the word is found in an output file. A word may appear in multiple lines. A word shows more than once at a line, the line number will be only recorded one time.

Ask a user to enter the name of a text file. Using try/except for invalid user input. Then the program reads the contents of the text file and create a dictionary in which the key-value pairs are described as follows:

• Key. The key are the individual words found in the file.
• Value. Each value is a list that contains the line numbers in the file where the word (the key) is found. Be aware that a list may have only one element.

Once the dictionary has been built, the program should create another text file for otuput, named “words_index.txt”. Next, write the contents of the dictionary to the file as an alphabetical listing of the words that are stored as keys in the dictionary (sorting the keys), along with the line numbers where the words appear in the original file. Please create a sample file for your reference.

Here are some tips:

• Documents/Comments of your program (Never more)
• Testing your program by the creating two files, Kennedy.txt and romeo.txt. The output file of the Kennedy_index.txt, Kennedy_index_B.txt, Kennedy_index_C.txt, for input file “kennedy.txt” and the output file romeo_index.txt, romeo_index_B.txt, romeo_index_C.txt, for input file romeo.txt
• Remember the output file name of your program is words_index.txt.

Answer 1

Please find the following program to analyze the words present in input file and added necessary comments in the program.

Program:

print(" This is a word analysis software")
fileName=input("Enter the input file name: ")

#empty dictionary declaration
finalDict ={}
#line number variable
number = 0

#exception handler if file is not present
try:
fh = open(fileName, "r")
except IOError:
print("Error: Unable to open input file to read data")
exit()

#read the file line one by one and update the dictionary
for line in fh:
number = number + 1
list1 = line.split()
#get the unique words from a line
list1 = set(list1)
for item in list1:
#if the word is not present in dictionary, create a new key for the words
#and update the line number as a list
if item not in finalDict:
listTemp=[]
listTemp.append(number)
finalDict[item] = listTemp
else:
#if word is present as a key then append the line number to the existing list
finalDict[item].append(number)

#uncomment the following code for debugging
#print(finalDict)

try:
f = open("words_index.txt", "w")
except IOError:
print("Error: Unable to open input file to read data")
exit()

f.write("WORDS Line Numbers\n")
for i in sorted (finalDict.keys()) :
f.write("%-10s " %(i))
for item in finalDict[i]:
f.write("%s " %(item))
f.write("\n")
  

Output:

This is a word analysis software
Enter the input file name: input.txt

cat words_index.txt

WORDS Line Numbers
asd 1 3
gfd 3
gfh 1
ghjgh 3
kgj 2
sdf 2
wer 2

Screen Shot:

input.txt

words_index.txt