Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Charge account validation python

20/11/2020 Client: papadok01 Deadline: 24 Hours

Programming in Python CS21A

Lab 4: Lists and Tuples – Files (25 points)

Learning Objectives for this lab include:

 Understand list basics including elements and subscripts.

 Learn how to find high and low values of a list.

 Learn how to step through and process the elements of a list.

 Learn how to pass lists as arguments to a function.

 Learn how to write lists in Python code.

 Open a text file for output and write strings or numbers to the file

 Open a text file for input and read strings or numbers from the file

An array is called a list in Python. A list is an object that contains multiple data items. Lists are

mutable, which means that their contents can be changed during a program's execution. Lists are

dynamic data structures, meaning that items may be added to them or removed from them.

Index or subscript starts at 0 in Python.

Numeric Arrays

Elements of an array can be defined as follows if the values are known:

even_numbers = [2, 4, 6, 8, 10]

If the numbers are not known at the beginning, use the repetition operator (*) to create a list with

a specific number of elements, each with the same example. The following will create an array

of 10 elements all set to 0 in the beginning.

numbers = [0] * 10

String Arrays

Elements of a string array are initialized as follows:

names = ['Molly', 'Will', 'Alicia', 'Adriana']

Printing Values of the Array

This can be done in one sequence by the following:

print (even_numbers)

The will result in the list printing as follows: [2, 4, 6, 8, 10].

Using Loops and Index

In most cases, a loop should be used to get values in or out of an array. This will allow a specific

index to be specified. A for loop or a while loop will work.

The for loop

numbers = [99, 100, 101, 102]

for n in numbers:

print(n)

The while loop

index = 0

while index < 4:

print (my_list[index])

index += 1

Lists and Tuples

- Lists are mutable; tuples are immutable.

- Lists and tuples are sequences.

- Lists allow assignment: L[3] = 7

Tuples do not.

Standard operations:

- length function: len(L)

- membership: in

- max and min: max(L) and min(L)

- sum: sum(L)

Indexing and Slicing

Given: L = ['b', 7, 6, 5,[2,9,1],5.5]

- Tuples work the same with indexing and slicing.

- Indexing starts at 0: L[0] is ‘b’.

- Negative indices work backward from the end: L[-1] is 5.5.

- Slicing selects a subset up to but not including the final index: L[1:4] is [7,6,5].

- Slicing default start is the beginning, so L[:3] is ['b', 7, 6].

- Slicing default end is the end, so L[4:] is [[2, 9, 1], 5.5].

- Using both defaults makes a copy: L[:].

- Slicing’s optional third argument indicates step: L[:6:2] is ['b', 6, [2, 9, 1]].

- The idiom to reverse a list: L[::-1] is [5.5, [2, 9, 1], 5, 6, 7, 'b'].

List Methods (partial list)

Given: L1 = [1,3,2] and L2 = [7,8]

- L1.append(0) changes L1 to be [1,3,2,0].

- L1.append(L2) changes L1 to be [1,3,2,[7,8]].

- L1.extend(L2) changes L1 to be [1,3,2,7,8].

- L1.sort() changes L1 to be [1,2,3].

- L1.insert(2,11) inserts 11 before index 2, so L1 becomes [1,3,11,2].

- L1.remove(3) removes 3, so L1 becomes [1,2].

- L1.reverse() changes L1 to be [2,3,1].

- L1.pop() pops 2 off, so L1 becomes [1,3] and returns 2.

Programming in Python Summer 2014

CS21A June 30, 2014

Methods Shared by Lists and Tuples (partial list)

Given: L1 = [1,3,2] and L2 = [7,8]

- L1.index(3) returns the index of item 3, which is 1.

- L1.count(1) counts the number of 1’s in L1: 1 in this case.

Writing to a File

When writing to a file, an internal file name must be created, such as outFile.

This file must then be opened using two arguments. The first argument is the name of the file

and the second is the mode you want to open the file in. You can select either the ‘a’ append

mode or the ‘w’ write mode. For example:

outFile = open('filename.txt', 'w')

Files must then be closed. This works the same for both input and output.

outFile.close() or inFile.close()

Reading from a File

When reading from a file, an internal file name must be created such as inFile.

This file must then be opened using two arguments. The first argument is the name of the file

and the second is the mode you want to open the file in, ‘r’ for read. For example:

inFile = open('filename.txt', 'r')

Reading from a file is done sequentially in this lab, and a call to read must occur. If a string

header is done first, that must be read into a string variable. That variable can then be used for

processing within the program.

A string literal can be read from a file and displayed to the screen such as:

str1 = inFile.read()

print (str1)

Arrays and variables can be read as a single input such as:

arrayName = inFile.read()

print (arrayName)

Lab 4.1: Total Sales [10 points]

1. Open the program TotalSales.py file.

2. Fill in the code so that the program will do the following:

 Ask the user to enter a store’s sales for each day of the week.

 The amounts should be stored in a list.

 Use a loop to calculate the total sales for the week and display the result.

Save the code to a file by going to File Save.

Python Code:

def main():

# Variables

total_sales = 0.0

# Initialize lists

daily_sales = [0.0,0.0,0.0,0.0,0.0,0.0,0.0]

days_of_week = ["Sunday","Monday", "Tuesday", "Wednesday", "Thursday",

"Friday", "Saturday"]

'''Fill in this space to ask the user to enter a store’s sales for each

day of the week. The amounts should be stored in a list.

Use a loop to calculate the total sales for the week and display the

result'''

print ("Total sales for the week: $", format(total_sales, '.2f'), sep='')

main()

Here is a sample run of the program:

Enter the sales for Sunday: 56

Enter the sales for Monday: 23

Enter the sales for Tuesday: 67

Enter the sales for Wednesday: 23

Enter the sales for Thursday: 42

Enter the sales for Friday: 78

Enter the sales for Saturday: 23

Total sales for the week: $312.00

Lab 4.2 – Charge Account Validation [15 points]

1. Open the program AccountValidation.py file.

2. Fill in the code so that the program will do the following:

 Read the contents of the file into a list.

 Ask the user to enter a charge account number.

 Determine whether the number is valid by searching for it in the list. If the number is

in the list, the program should display a message indicating the number is valid. If the

number is not in the list, the program should display a message indicating the number

is invalid.

The file charge_accounts.txt has a list of a company’s valid charge account numbers. Each

account number is a seven-digit number, such as 5658845 .

Save the code to a file by going to File Save.

Python Code:

def main():

# Local variables

test_account = ''

# Open the file for reading

input_file = open('charge_accounts.txt', 'r')

# Read all the lines in the file into a list

accounts = input_file.readlines()

# Strip trailing '\n' from all elements of the list

for i in range(len(accounts)):

accounts[i] = accounts[i].rstrip('\n')

# Fill in this space to get user input

# Fill in this space to use in operator to search for the

# account specified by user

# Call the main function.

main()

Here is a sample run of the program:

Enter the account number to be validated: 56

Account number 56 is not valid.

Enter the account number to be validated: 5658845

Account number 5658845 is valid.

Submission

1. Include the standard program header at the top of your Python file.

2. Submit your files to Etudes under the “Lab 04“ category.

TotalSales.py

AccountValidation.py

Standard program header

Each programming assignment should have the following header, with italicized text

appropriately replaced.

Note: You can copy and paste the comment lines shown here to the top of your assignment each

time. You will need to make the appropriate changes for each lab (lab number, lab name, due

date, and description).

'''

* Program or Lab #: Insert assignment name

* Programmer: Insert your name

* Due: Insert due date

* CS21A, Summer 2014

* Description: (Give a brief description for Lab4)

Lab 5: Strings - sets and dictionaries (25 points)

This lab will give you some experience with strings and sets.

Lab 5.1: Character Analysis [12 points]

1. Open the Python program CharacterAnalysis.py.

2. Fill in the code so that the program will do the following:

 Read the file’s contents (text.txt) and determines the following:

o The number of uppercase letters in the file

o The number of lowercase letters in the file

o The number of digits in the file

o The number of whitespace characters in the file

3. Save the code to a file by going to File Save.

Python File:

def main():

# Local variables

num_upper = 0

num_lower = 0

num_space = 0

num_digits = 0

data = ''

# Open file text.txt for reading.

infile = open('text.txt', 'r')

# Read in data from the file.

data = infile.read()

# Fill in this space to step through each character in

# the file.

# Determine if the character is uppercase,

# lowercase, a digit, or space, and keep a

# running total of each.

# Close the file.

infile.close()

# Display the totals.

# Call the main function.

Main()

Here is a sample run:

Uppercase letters: 29

Lowercase letters: 1228

Digits: 30

Spaces: 260

Lab 5.2: Unique Words [13 points]

1. Open the Python program UniqueWords.py.

2. Fill in the code so that the program will do the following:

 Open a specified text file

 Then displays a list of all the unique words found in the file.

Hint: Store each word as an element of a set.

3. Save the code to a file by going to File Save.

Python File:

def main():

# Get name of input file.

input_name = input('Enter the name of the input file: ')

# Open the input file and read the text.

input_file = open(input_name, 'r')

text = input_file.read()

words = text.split()

# Fill in this space to create set of unique words.

# Fill in this space to print the results.

# Close the file.

input_file.close()

# Call the main function.

main()

Submission

1. Include the standard program header at the top of your Python file.

2. Submit your files to Etudes under the “Lab 5 “ category.

CharacterAnalysis.py

UniqueWords.py

Standard program header

Each programming assignment should have the following header, with italicized text

appropriately replaced.

Note: You can copy and paste the comment lines shown here to the top of your assignment each

time. You will need to make the appropriate changes for each assignment (assignment number,

due date, and description).

'''

* Program or Lab #: Insert assignment name

* Programmer: Insert your name

* Due: Insert due date

* CS21A, Summer 2014

* Description: (Give a brief description for Lab 5)

'''

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Homework Guru
Best Coursework Help
Calculation Guru
Quality Homework Helper
University Coursework Help
Top Essay Tutor
Writer Writer Name Offer Chat
Homework Guru

ONLINE

Homework Guru

Hi dear, I am ready to do your homework in a reasonable price and in a timely manner.

$62 Chat With Writer
Best Coursework Help

ONLINE

Best Coursework Help

I am an Academic writer with 10 years of experience. As an Academic writer, my aim is to generate unique content without Plagiarism as per the client’s requirements.

$60 Chat With Writer
Calculation Guru

ONLINE

Calculation Guru

I see that your standard of work is to get content for articles. Well, you are in the right place because I am a professional content writer holding a PhD. in English, as well as having immense experience in writing articles for a vast variety of niches and category such as newest trends, health issues, entertainment, technology, etc and I will make sure your article has all the key pointers and relevant information, Pros, Cons and basically all the information that a perfect article needs with good research. Your article is guaranteed to be appealing, attractive, engaging, original and passed through Copyscape for the audience so once they start reading they keep asking for more and stay interested.

$55 Chat With Writer
Quality Homework Helper

ONLINE

Quality Homework Helper

Hi dear, I am ready to do your homework in a reasonable price.

$62 Chat With Writer
University Coursework Help

ONLINE

University Coursework Help

Hi dear, I am ready to do your homework in a reasonable price.

$62 Chat With Writer
Top Essay Tutor

ONLINE

Top Essay Tutor

I have more than 12 years of experience in managing online classes, exams, and quizzes on different websites like; Connect, McGraw-Hill, and Blackboard. I always provide a guarantee to my clients for their grades.

$65 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Computer-Aided Qualitative Data Analysis - History of simplex method - Experiment 5 the importance of cell cycle control - Pall hydrophobic vent filter - Globalization changed - Accounting Topic Paper 4 pages - Small Lisp and C Code - Leadership in Org.& Small Groups - Eng 121 week 3 assignment - University of washington credits - Required inspection item far - John f antioco net worth - Ethos in the gettysburg address - Joe brainard i remember pdf - Cti 9600 compressor manual - Freedom rides australia map - General characteristics of victorian age - Ecomap key symbols - Halton borough council taxi licensing - Romeo and juliet reflection tagalog - Competencies - 5 callemondah avenue north gosford - Faye sayer time team - Recorded services provided on account journal entry - Do grades do justice to students knowledge - Which is the smallest state in australia - The vanishing coin comprehension questions - Accident error injury prevention ati - How to win friends and influence people critique - Pillow method examples - Pp management - How to reduce employee turnover rate in capsim - Today poem by billy collins - Ucl spatial data science and visualisation - New and Improved rewards at work - How to determine square yards from square feet - Strategy and hrm at delta airlines case study - Research paper - Variable rate overtime frito lay - Chemical digestion of protein begins in the - Oooooh i fall apart - Car ferry to kangaroo island - Neutralisation of carboxylic acids - The primary challenge of a distributed database is - Kiosk Requirements - 3rd order rate law - Rondell data corporation case study pdf - Borehole pump electrical connection - NUR504 - Lift up your voice and sing lyrics - Acct 212 course project - Polar diagram operations management - Moseley x ray experiment - Retrograde massage occupational therapy - Informative outline example - Discussion Post- Due today 11:00pm ET - Software Quality Paper - Target brand proactiv - The size of gear is usually specified by - Non sequitur examples in commercials - Psychology social influence quiz - Hunger games hero's journey - Brigg to scunthorpe bus - Two way intercom project - Nova labs the evolution lab mission 3 - For genuine services in math please contact +91 9644109597 - Engineering thermodynamics equation sheet - A security fence encloses a rectangular area - Biking vectors mastering physics - VSee Box Redefine Your Entertainment - West egg and east egg quotes - Https www internetsociety org tutorials your digital footprint matters - Lusk corporation produces and sells - Why is dibenzalacetone yellow - Prepare a classified balance sheet as of december 31 2018 - Everyday uses of ph indicators - P song jolly phonics - Small Group Communication - Green computing report - Allen ivey microskills - Gce environmental studies sample questions - If equity is $300,000 and liabilities are $192,000, then assets equal: - Given the data in the chart above, which of the following trade scenarios is the most efficient? - Case study 8 1 klm airlines - Altium schematic template title block - Mini case Harry - The primary objective of financial accounting is to - Boundary pool fence regulations victoria - Crisis payment from centrelink - Lewis dot structure for ionic compounds worksheet answers - How to address key selection criteria - Persuasive writing grade 3 - Managerial Economics - At what times do the various steps of the google three-step tcp handshake occur? - Physics vector problems worksheet - Discussion 3c2 - A low cost leader's basis for competitive advantage is - Tree diagram with and without replacement - IT incident response wk7 - Marks by linda pastan summary