代写Python代写程序、代做data编程、Python编程调试

日期：2021-03-31 11:38

Modul e 10 Lab: Ex c eption Handl ing

In this assignment, you are asked to use what we have covered in Modules 1-10 to calculate

the Flesch readability index of a document. Invented by Dr. Rudolf Flesch, the Flesch readability

index is a tool for estimating how difficult a document is to read and comprehend. The index

does not consider the meaning of words, only their lengths and the lengths of sentences, in

order to assign a readability index to the document. The higher the readability index, the easier

a document is to comprehend.

U n d e r s t a n d i n g F l e s c h I n d e x

Flesch index is calculated using the following formula:

Once calculated, this index can be translated into the educational level that is usually necessary

to understand a document, as shown in the table below.

Flesch Index (F) Grade Level (G) Example

90.0-100.0 5th Grader Comic

80.0-89.9 6th Grader Consumer ads

70.0-79.9 7th Grader Alice in Wonderland

65.0-69.9 8th Grader Sports Illustrated

50.0-64.9 High schooler Time Magazine

30.0-49.9 College New York Times

0.0-29.9 College graduate Auto Insurance

< 0.0 Law school graduate IRS tax code

Wo r d s a n d s e n t e n c e s

A character is any symbol in the text file. Examples of characters include letters, numerical

digits, hyphens, and punctuation marks but not whitespace characters (e.g, spaces, tabs,

new-line characters).

Words are sequences of characters that are separated by whitespace.

Sentences are separated by a period, question mark, exclamation point, colon or semicolon.

S y l l a b l e s

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2021/3/28 Module 10 Lab

https://northeastern.instructure.com/courses/63364/assignments/827242 3/5

It is difficult to determine the exact number of syllables in a word just from the spelling. However,

we can do a pretty good job using the following heuristics:

Count up the groups of adjacent vowels (aeiouy) in the word. (Note that the letter 'y' is

considered a vowel for this algorithm)

If 'e' is the last letter in the word and is preceded by a non-vowel, then it does not count as a

syllable (i.e., the 'e' is silent). For example, "life" has only 1 syllable, while "alumnae" has 3

Under the previous 2 rules "me" would have zero syllables since the 'e' at the end of the

word isn't considered a syllable. To address this, always report that there is at least 1

syllable

If you apply these rules, then Creighton has 2 syllables, "University" has 5, and "sea" has 1.

Don't worry if the answer given by your program isn't exactly the correct number of syllables.

This is a heuristic after all. Rather make sure your program produces values that agree with the

heuristic described above.

Wha t to do

readability.zip

Your job will be to implement the functions that are required by the provided driver program. You

should implement the indicated functions in the provided "readability.py" module (we highly

recommend implementing tests for your functions as well). Then you should modify the driver

program so that any errors that are raised by your modules are handled by printing an

appropriate message to the screen.

Additionally, I am providing a number of example documents that you can use to test various

aspects of your program. Each file has a different challenge that your program should be able to

handle.

To help clarify what the main() function is supposed to do consider the following runs of the

program:

Case 1: In case the user tries to open a non-existing file

Filename: abc.txt

abc.txt does not exist

Case 2: In case the user tries to open a file that he does not have permission to open

Filename: abc.txt

You do not have sufficient permissions to open abc.txt

Case 3: In case of any operating system error

2021/3/28 Module 10 Lab

https://northeastern.instructure.com/courses/63364/assignments/827242 4/5

Filename: abc.txt

An unexpected error occurred while attempting to open abc.txt.

Case 4: Using the "college.txt" example

Filename: college.txt

Sentences: 1

Words: 15

Syllables: 31

Words per Sentence: 15.0

Syllables per Word: 2.1

Flesch Index: 16.8

Flesch Grade: College graduate

Case 5: Using the "sixth-grade.txt" example

Filename: sixth-grade.txt

Sentences: 2

Words: 29

Syllables: 37

Words per Sentence: 14.5

Syllables per Word: 1.3

Flesch Index: 84.2

Flesch Grade: 6th grader

Case 6: Using the "gettysburg.txt" example

Filename: gettysburg.txt

Sentences: 11

Words: 282

Syllables:400

Words per Sentence: 25.6

Syllables per Word: 1.4

Flesch Index: 60.8

Flesch Grade: High schooler

There are a couple more provided files that we will leave for you to figure out on your own!

Your test suite should be implemented in a file called "readability_tests.py" and should make

sure that the functions in the readability module work correctly. The goal here is to write tests

so that you have confidence in your own work. Write enough tests with enough variety that you

would feel comfortable handing your indexer off to the Editor of the Addison-Wesley Publishing

Company saying, "Don't worry it works great!"

2021/3/28 Module 10 Lab

https://northeastern.instructure.com/courses/63364/assignments/827242 5/5

Submi s s ion

When your program successfully passes your tests locally, upload it to codePost and make sure

it passes the visible test cases there and that you are following the style guidelines for Modules

1-10.

? 完成