Question

Complete this by first working these problems on paper, then put them into pep8 and verify they work correctly. Upload the pep0 programs only

1. Input 3 decimal numbers (integers) . Add them together and output the result. Verify your solution works for positive numbers, and negative numbers.
2. Input two decimal numbers and then subtract the second from the first. Verify your solution works if the result is positive or negative.
3. Input one integer using decimal input trap and multiply it by 4. Output the result.
4. Similar to #3, but divide the integer by 16. Output the result.

Answer 1

Since PEP8 are some conventional rules for python code.

So first install pylint for testing the python code for PEP 8.

Following is the command for installing pylint on ubunto system :

pip install pylint

then run the code in following way to test PEP 8:

python3 -m pylint demo.py

Below is the code for mentioned problem statement written in python3 :

"""
This program consists of addition, subtraction ,multiplication and dividion methods.
"""

def add_3_numbers(list_add):
    """
    This function will do the sum of three numbers
    :rtype: decimal
    """
    sum_all = 0.0
    for item in list_add:
        sum_all = sum_all + item

    return sum_all

def sub_2_numbers(list_sub):
    """
    This function will do the subtraction of two numbers
    :rtype: decimal
    """
    return list_sub[0] - list_sub[1]

if __name__ == "__main__":
    ADDLIST = []
    SUBLIST = []
    print("Please enter 3 numbers for addition : ")
    for x in range(3):
        number = float(input("Enter " + str(x + 1) + " number : "))
        ADDLIST.append(number)
    SUMOFNUMBERS = add_3_numbers(ADDLIST)
    print("Sum of entered numbers : ", SUMOFNUMBERS)

    print("\nPlease enter 2 numbers for subtraction : ")
    for y in range(2):
        number = float(input("Enter " + str(y + 1) + " number : "))
        SUBLIST.append(number)
    SUBNUMBERS = sub_2_numbers(SUBLIST)
    print("Subtraction of entered numbers : ", SUBNUMBERS)

    MULNUMBER = float(input("\nEnter number for multiplication : "))
    print("Multiplication result : ", 4*MULNUMBER)

    DIVNUMBER = float(input("\nEnter number for divide : "))
    print("Division result : ", DIVNUMBER/16)

output:

Please enter 3 numbers for addition :
Enter 1 number : 32134
Enter 2 number : 2342134
Enter 3 number : 3525231
Sum of entered numbers : 5899499.0

Please enter 2 numbers for subtraction :
Enter 1 number : 5325231
Enter 2 number : 3215123
Subtraction of entered numbers : 2110108.0

Enter number for multiplication : 251
Multiplication result : 1004.0

Enter number for divide : 2135
Division result : 133.4375

Process finished with exit code 0

screen shot code before scan by pylint:

screenshot of pylint scan for above code:

After this modifying the code suggested by pylint:

Final pylint report with 0 error or warning : with 10/10 rating : Your code has been rated at 10.00/10 (previous run: 8.46/10, +1.54)