File Update Python Algorithm | Python, Linux

In this project I have been tasked with creating a Python program that compares two lists, one of allowed ip’s to a system and the other the remove list, that has IP’s to be removed from access privileges. This, to update the users allowed to access patient information in a health care provider.

Open the file that contains the allow list

So, first, I open the file with the ‘with’ and ‘open’ commands:

import_file='allow_list.txt'
remove_list=['192.168.97.225','192.168.158.180','192.168.201.40','192.168.58.57']
with open(import_file,'r') as file:

Read the file contents

Then I read the contents of the document with the . read() function inside the ‘with open’ statement:

    ip_addresses=file.red()

Convert the string into a list

Then I turn the contents currently stored as a string into a list for Python to easily parse the data with the .split() method:

ip_addresses=ip_addresses.split()

Iterate through the remove list using a ‘for’ loop

for ip in ip_addresses:

Remove IP addresses that are in the remove list inside the ‘for’ loop.

    if ip in remove_list:
        ip_addresses.remove(ip)

Convert ip_addresses back to list for updating the file

ip_addresses=' '.join(ip_addresses)

Update the file with the revised list of IP addresses

Using a with open method in w (write) I update the file with the write() method.

with open(import_file,'w') as file:
    file.write(ip_addresses)

FULL CODE

import_file='allow_list.txt'
remove_list=['192.168.97.225','192.168.158.180','192.168.201.40','192.168.58.57']
with open(import_file,'r') as file:
    ip_addresses=file.red()
ip_addresses=ip_addresses.split()
for ip in ip_addresses:
    if ip in remove_list:
        ip_addresses.remove(ip)
ip_addresses=' '.join(ip_addresses)
with open(import_file,'w') as file:
    file.write(ip_addresses)

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