Python assign code h/w | Computer Science homework help

 

Start with the following Python code.  

alphabet = “abcdefghijklmnopqrstuvwxyz”   

test_dups = [“zzz”,”dog”,”bookkeeper”,”subdermatoglyphic”,”subdermatoglyphics”] 

test_miss = [“zzz”,”subdermatoglyphic”,”the quick brown fox jumps over the lazy dog”] 

# From Section 11.2 of: 

# Downey, A. (2015). Think Python: How to think like a computer scientist. Needham, Massachusetts: Green Tree Press. 

def histogram(s):
     d = dict()
     for c in s:
          if c not in d:
               d[c] = 1
          else:
               d[c] += 1
     return d 

Copy the code above into your program but write all the other code for this assignment yourself. Do not copy any code from another source. 

Part 1 

Write a function called has_duplicates that takes a string parameter and returns True if the string has any repeated characters. Otherwise, it should return False.  

Implement has_duplicates by creating a histogram using the histogram function above. Do not use any of the implementations of has_duplicates that are given in your textbook. Instead, your implementation should use the counts in the histogram to decide if there are any duplicates. 

Write a loop over the strings in the provided test_dups list. Print each string in the list and whether or not it has any duplicates based on the return value of has_duplicates for that string. For example, the output for “aaa” and “abc” would be the following. 

aaa has duplicates
abc has no duplicates 

Print a line like one of the above for each of the strings in test_dups. 

Part 2 

Write a function called missing_letters that takes a string parameter and returns a new string with all the letters of the alphabet that are not in the argument string. The letters in the returned string should be in alphabetical order. 

Your implementation should use a histogram from the histogram function. It should also use the global variable alphabet. It should use this global variable directly, not through an argument or a local copy. It should loop over the letters in alphabet to determine which are missing from the input parameter. 

The function missing_letters should combine the list of missing letters into a string and return that string. 

Write a loop over the strings in list test_miss and call missing_letters with each string. Print a line for each string listing the missing letters. For example, for the string “aaa”, the output should be the following. 

aaa is missing letters bcdefghijklmnopqrstuvwxyz 

If the string has all the letters in alphabet, the output should say it uses all the letters. For example, the output for the string alphabet itself would be the following. 

abcdefghijklmnopqrstuvwxyz uses all the letters 

Print a line like one of the above for each of the strings in test_miss. 

Submit your Python program. It should include the following. 

  • The provided code for alphabet, test_dups, test_miss, and histogram. 
  • Your implementation of the has_duplicates function. 
  • A loop that outputs duplicate information for each string in test_dups. 
  • Your implementation of the missing_letters function. 
  • A loop that outputs missing letters for each string in test_miss. 

Also submit the output from running your program. 

Your submission will be assessed using the following Aspects.

  1. Does the program include a function called has_duplicates that takes a string parameter and returns a boolean?
  2. Does the has_duplicates function call the histogram function? 
  3. Does the program include a loop over the strings in test_dups that calls has_duplicate on each string? 
  4. Does the program correctly identify whether each string in test_dups has duplicates? 
  5. Does the program include a function called missing_letters that takes a string parameter and returns a string? 
  6. Does the missing_letters function call the histogram function?
  7. Does the missing_letters function use the alphabet global variable directly?
  8. Does the program include a loop over the strings in test_miss that calls missing_letters on each string?
  9. Does the program correctly identify the missing letters for each string in test_miss, including each string that “uses all the letters”?
Get 20% Discount on This Paper
Pages (550 words)
Approximate price: -

Try it now!

Get 20% Discount on This Paper

We'll send you the first draft for approval by at
Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

Assignment Help has assembled a team of highly skilled writers with diverse experience in the online writing circles. Our aim is to become a one stop shop for all your Academic/ online writing. Check out below our amazing service!

Essays

Essay Writing Services

At Assignment Help, we prioritize on all aspects that creates a good grade such as impeccable grammar, proper structure, zero-plagiarism, and conformance to guidelines. The principal purpose of essay writing is to present the author's evaluation concerning a singular subject about which they have made. Since Professionalism is the mother of every success, try our team of experienced writers in helping you complete your essays and other assignments.

Admissions

Admission Papers

You have been trying to join that prestigious institution you long yearned for, but the hurdle of an admission essay has become a stumbling block. We have your back, with our proven team that has gained invaluable experience over time, your chance of joining that institution is now! Just let us work on that essay.How do you write an admission essay? How do you begin the essay? For answers, try Quality Custom Writers Now!

Editing

Editing and Proofreading

Regardless of whether you're pleased with your composing abilities, it's never an impractical notion to have a second eye go through your work. The best editing services leaves no mistake untouched. We recognize the stuff needed to polish up a writing; as a component of our editing and proofreading, we'll change and refine your write up to guarantee it's amazing, and blunder free. Our group of expert editors will examine your work, giving an impeccable touch of English while ensuring your punctuation and sentence structures are top-notch.

Coursework

Technical papers

We pride ourselves in having a team of clinical writers. The stringent and rigorous vetting process ensures that only the best persons for job. We hire qualified PhD and MA writers only. We equally offer our team of writers bonuses and incentives to motivate their working spirit in terms of delivering original, unique, and informative content. They are our resources drawn from diverse fields. Therefore your technical paper is in the right hands. Every paper is assessed and only the writers with the technical know-how in that field get to work on it.

Coursework

College Essay Writing

If all along you have been looking for a trustworthy college essay service provider that provides superb academic papers at reasonable prices, then be glad that you search has ended with us. We are your best choice! Get high-quality college essay writing from our magnificent team of knowledgeable and dedicated writers right now!

Coursework

Quality Assignment/Homework Help

We give the students premium quality assignments, without alarming them with plagiarism and referencing issues. We ensure that the assignments stick to the rules given by the tutors. We are specific about the deadlines you give us. We assure you that you will get your papers well in advance, knowing that you will review and return it if there are any changes, which should be incorporated.