Project description

At my organization, there is an allow list of IP addresses of employees who have access to restricted content. I created an algorithm for the “allow_list.txt” file which removes the IP addresses which no longer have access from the list.

Algorithm for file updates in Python

Open the file that contains the allow list

# Assign `import_file` to the name of the file

import_file = "allow_list.txt"

# Build `with` statement to read in the initial contents of the file

with open("import_file", "r") as file:

Read the file contents

# Use `.read()` to read the imported file and store it in a variable named `ip_addresses`

ip_addresses = file.read()

Convert the string into a list

# Use `.split()` to convert `ip_addresses` from a string to a list

ip_addresses = ip_addresses.split()

Iterate through the remove list

# Build iterative statement
# Name loop variable `element`
# Loop through `ip_addresses`

for element in ip_addresses:

    print(element)

Remove IP addresses that are on the remove list

# Build conditional statement

for element in ip_addresses:


    if element in remove_list:

        ip_addresses.remove(element)

Update the file with the revised list of IP addresses

# Convert `ip_addresses` back to a string so that it can be written into the text file 

ip_addresses = " ".join(ip_addresses)

# Build `with` statement to rewrite the original file

with open(import_file, "w") as file:

  # Rewrite the file, replacing its contents with `ip_addresses`

  file.write(ip_addresses)

Final Algorithm

Example: Pass in ["192.168.25.60", "192.168.140.81", "192.168.203.198"] as IP addresses to remove

# Define a function named `update_file` that takes in two parameters: `import_file` and `remove_list`
# and combines the steps you've written in this lab leading up to this

def update_file(import_file, remove_list):

  # Build `with` statement to read in the initial contents of the file

  with open(import_file, "r") as file:

    # Use `.read()` to read the imported file and store it in a variable named `ip_addresses`

    ip_addresses = file.read()

  # Use `.split()` to convert `ip_addresses` from a string to a list

  ip_addresses = ip_addresses.split()

  # Build iterative statement
  # Name loop variable `element`
  # Loop through `ip_addresses`

  for element in ip_addresses:
    
    # Build conditional statement
    # If current element is in `remove_list`,
    
    if element in remove_list:

      # then current element should be removed from `ip_addresses`

      ip_addresses.remove(element)

  # Convert `ip_addresses` back to a string so that it can be written into the text file 

  ip_addresses = " ".join(ip_addresses)       

  # Build `with` statement to rewrite the original file

  with open(import_file, "w") as file:

    # Rewrite the file, replacing its contents with `ip_addresses`

    file.write(ip_addresses)

# Call `update_file()` and pass in "allow_list.txt" and a list of IP addresses to be removed

update_file("allow_list.txt",["192.168.25.60", "192.168.140.81", "192.168.203.198"] )

# Build `with` statement to read in the updated file

with open("allow_list.txt", "r") as file:

  # Read in the updated file and store the contents in `text`

  text = file.read()

# Display the contents of `text`

print(text)

OUTPUT for algorithm with input from above

192.168.6.9 192.168.90.124 192.168.133.188 192.168.218.219 192.168.156.224 192.168.69.116