Here is the gettysburg.txt file

Four score and seven years ago our fathers brought forth on this

continent a new nation conceived in Liberty and dedicated to the

proposition that all men are created equal

Now we are engaged in a great civil war testing whether that nation

or any nation so conceived and so dedicated can long endure We are

met on a great battle field of that war We have come to dedicate a

portion of that field as a final resting place for those who here

gave their lives that that nation might live It is altogether

fitting and proper that we should do this

But in a larger sense we can not dedicate we can not consecrate

we can not hallow this ground The brave men living and dead

who struggled here have consecrated it far above our poor power to

add or detract The world will little note nor long remember what

we say here but it can never forget what they did here It is for

us the living rather to be dedicated here to the unfinished work

which they who fought here have thus far so nobly advanced It is

rather for us to be here dedicated to the great task remaining

before us that from these honored dead we take increased devotion

to that cause for which they gave the last full measure of devotion

that we here highly resolve that these dead shall not have died

in vain that this nation under God shall have a new birth of

freedom and that government of the people by the people for the

people shall not perish from the earth

Note : Use Pyhon please.

There is one deliverable for this assignment:

hw4.py

It must be in an hw4 directory, which you must create inside a hw directory inside you it117 directory. Make sure the script obeys all the rules in the Script Requirements page. To test this script you must copy into your hw4 directory the file gettysburg.txt from /home/ghoffman/course_files/it117_files.

Specification

Create a script that does the following

Reads in a text file

Creates a dictionary of word frequencies

In this dictionary they keys will be words found in the file

The values would be the number of times the word appeared

Prints a sorted list of all words in the file and how many times they appeared in the file

In the frequency dictionary, the keys would be individual words and the values would be the number of times the word appeared in the file. This script must contains two functions.

word_frequencies_create

word_frequency_print

word_frequencies_create

This function must have the following header

def word_frequencies_create(filename): 

This function should read in a text file and return a word frequency dictionary. A word frequency dictionary is one where the keys are words and the values are the number of times the word appears in the file. This function must ignore case, so "We" and "we" should count as the same word.

word_frequency_print

This function has the following header

def word_frequency_print(frequencies): 

This function must print the words in alphabetical order along with the number of times each word appears in the file.

Test Code

The script must contain the following test code at the bottom of the file

word_freq = word_frequencies_create('xxxxxxx') word_freq = word_frequencies_create('gettysburg.txt') word_frequency_print(word_freq) 

Suggestions

Write this script in stages, testing your script at each step

Create a file with the hashbang line, the test code and each function. The body of the function should be the Python statement pass which does nothing but it stops syntax errors.

Remove the pass statement in word_frequencies_create and replace it with code that opens a file for reading. If the file cannot be opened for reading, the code should print an error message and not do any further processing of the file.

Create an empty dictionary called word_frequency. After this statement write a for loop that prints each line in the file.

Use the lower string method to change all capital letters in the string to lower case.

Use the split string method to create a list of all the words in the file. Print this list.

Remove the previous print statement. In its place write a for loop that prints each word in the list.

Write an if statement that checks whether the word is already in the dictionary. If not add this word to the dictionary with the value 1. Outside both for loops, print the dictionary.

Add an else clause to the if statement that adds 1 to the value associated with the word.

Remove the print statement from the end of the function. Replace it with a statement that returns the word_frequencies_create dictionary. Remove the pass statement from word_frequency_print and replace it with a statement that prints the parameter frequencies.

Replace the print statement with a for loop that prints the word and word count value for each word in the dictionary.

Change the for loop so it prints the words in alphabetical order.

Output

When you run the program the output should look something like this

Cannot open file xxxxxxx a 7 above 1 add 1 advanced 1 ago 1 all 1 altogether 1 and 6 any 1 ... war 2 we 10 what 2 whether 1 which 2 who 3 will 1 work 1 world 1 years 1