Question

Writing python code: Can you do for me this.

The question looks bellow

Overview :

As a programmer, you have be asked by a good friend to create a program that will allow them to keep track of their personal expenses. They want to be able to enter their expenses for the month, store them in a file, and then have the ability to retrieve them later. However, your friend only wants certain people to have the ability to view his or her expenses, so they are requesting that you include some sort of login functionality. Instructions : For this challenge, you will start this application for your friend by concentrating on the login functionality. You will have a standard report in a text file where you will build login functionality to access. Below you will find the step by step instructions on how to develop this application.

1. Declaring Variables - You will start the application by declaring the following variables:

# username - initialized with an empty string to store the username entered by the user.

#password - initialized with an empty string to store the password entered by the user.

#repeat - initialized with the letter 'y' to control the looping of the program'

#passwordLength - intialized with the number 8 to validate password length ,

#Four flags set to false named hasAmpersand, hasValidLength, isValidUsername, and isValidPassword

2. Display the program header as shown in the images below

3. Your program must allow the program to repeat without re-displaying the program header.

4. You must obtain the username from the user then check to see if the username contains the @ symbol. If does, set the hasAmpersand flag to true and allow the program to continue. If it doesn't, alert the user that it is an invalid email and use the continue command to skip the rest of the code and repeat the program.

5. Obtain the user password and use a while loop to make sure that the user has entered a password greater than the number stored in the passwordLength variable. After the password has been validated to be greater than the stated password length, change the hasValidLength flag to true.

6. You will then use the hasAmpersand and hasValidLength flags to confirm whether or not to open the logins.txt file to confirm that this login information is present in the file. This is when you would change the appropriate isValid flags to state that they are in the file. (HINT: You can check first that the username is in the file, if not, then there is no need to check for the password.) If the username is not in the file, use the break statement to end the program as shown below.

7. The report stored in the PersonalExpense.txt file should only be display if both the username and password is correct.

8. The text files for this application are attached to the Dropbox. You may download and add them to your solution. Or feel free to create your own login and report pages. View comments (1)

Answer 1

CODE:

import csv

# dictionary to hold the login information

dict_login={}

# file reader to read the login.txt

reader = csv.reader(open('login.txt'))

for row in reader:

    key = row[0]

    if key in dict_login:

        # implement your duplicate row handling here

        pass

    dict_login[key] = row[1]

# initial instruction

print('Please enter the username, with email id')

print('Please enter the password, having length greater than 8')

# method to take inputs and perform business logic

def takeInputs():

    cntr=0

    # continue till user explicitly exits

    while(True):

        cntr+=1

        # if visiting second time

        if cntr>1:

            print("Want to login again?, press y to continue")

            y=input()

            if y.strip().lower()!="y":

                break

        username=input("Please enter username").strip()

        password=input("Please enter password").strip()

        hasAmpersand=False

        hasValidLength=False

        isValidUsername=False

        isValidPassword=False

        #if username contains @

        if "@" in username:

            hasAmpersand=True

            # if passowrd length is greter than 8

            if len(password)>=8:

                hasValidLength=True

                # if username is present in the login dictionary

                if username in dict_login:

                    isValidUsername=True

                    # if password mathces

                    if password==dict_login[username]:

                        isValidPassword=True

                        # logic to display  the expense report

                        filehandle = open("PersonalExpense.txt", 'r')

                        while True:

                            # read a single line

                            line = filehandle.readline()

                            if not line:

                                break

                            print(line)

                        filehandle.close()

                    # failed condition to password

                    else:

                        print("Supplied password was wrong")

                        continue

                # failed username presence

                else:

                    print("Provided username is not present in our records")

                    continue

            # failed pasword length criteria

            else:

                print("password length criteria not met, flow will restart")

                continue

        # failed username presence

        else:

            print("Not a valid username, flow will restart")

            continue

takeInputs()

FILES:

login.text

username,password
[email protected],ertyghyui
[email protected],machine54
[email protected],ertyghyui
[email protected],machine54
[email protected],ertyghyui
[email protected],machine54
[email protected],ertyghyui
[email protected],machine54

PersonalExpense.txt:

Some random information related to the expense

SNIPPET:

RESULT: