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Portfoleo project: Algorythm for file updates in Python

Algorithm for file updates in Python

Project description

this script automates management of an ip allowlist. the allowlist is in a file, and the script reads and writes to file.

Open the file that contains the allow list

import_file = "allow_list.txt"

# Assign `remove_list` to a list of IP addresses that are no longer allowed to access restricted information. 

remove_list = ["192.168.97.225", "192.168.158.170", "192.168.201.40", "192.168.58.57"]

# First line of `with` statement to open the file and store as variable file

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


Read the file contents

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

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

  ip_addr = file.read()

Convert the string into a list

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("\n")

# Display `ip_addresses`

print(ip_addresses)

Iterate through the remove list

for element in ip_addresses:

    # Display `element` in every iteration

    print(element)

Remove IP addresses that are on the remove list

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)
        # add to ips renmoved list

# Display `ip_addresses` 

print(ip_addresses)


Update the file with the revised list of IP addresses 

# Assign `import_file` to the name of the file 

import_file = "allow_list.txt"

# Assign `remove_list` to a list of IP addresses that are no longer allowed to access restricted information. 

remove_list = ["192.168.97.225", "192.168.158.170", "192.168.201.40", "192.168.58.57"]

# 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)

Final

create the allow-list as a file

# Assign `import_file` to the name of the file 

import_file = "allow_list.txt"
allow_list = """ip_address
192.168.25.60
192.168.205.12
192.168.97.225
192.168.6.9
192.168.52.90
192.168.158.170
192.168.90.124
192.168.186.176
192.168.133.188
192.168.203.198
192.168.201.40
192.168.218.219
192.168.52.37
192.168.156.224
192.168.60.153
192.168.58.57
192.168.69.116"""
# Assign `remove_list` to a list of IP addresses that are no longer allowed to access restricted information. 

remove_list = ["192.168.97.225", "192.168.158.170", "192.168.201.40", "192.168.58.57"]

# 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_addr = file.read()
    
temp_file = "task_3_remove_list.txt"
import_file = temp_file

with open(import_file, "w") as import_file:
    import_file.write(ip_addr)



# Display `ip_addresses`

print(ip_addr)


modify and prune the allow-list

# Assign `import_file` to the name of the file 

import_file = "allow_list.txt"

# Assign `remove_list` to a list of IP addresses that are no longer allowed to access restricted information. 

remove_list = ["192.168.97.225", "192.168.158.170", "192.168.201.40", "192.168.58.57"]

# 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)

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

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

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

    text = file.read()

# Display the contents of `text`

print(text)

Summary

in a hypothetical scenario where you needed to remove information from a large file this could save alot of time. this can save you lots of time.

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