Everything is a object in Python. the simplest class in Python: Class and Instance Attributes Class attributes are attributes that are owned by the class itself. Instance attributes are owned by the specific instances of a class Dynamically created attributes for existing instances of a class – not the way to properly create instance attributes, but an option. Python checks first,...
Dictionaries Dictionary – a collection of keys and values, unordered, changeable and indexed. Dictionary comprehensions Creating a dictionary from the list of keys with default value: Dictionary from list of keys and list of values: get(<key>,<value if does not exist>) If we try to get value from the non-existing key, KeyError Exception will be raise. To avoid the crush because of...
It is not about range feature:) After my post about how to get into the switch with “not sure” credentials, let’s assume you fixed access and configured devices with TACACS and SSH. It’s time to drop the interface-level config for ISE NAC (as an example) to all user ports, servers/wireless/trunk must be excluded. With proper segmentation using VLANs, we should have...
List Comprehensions One way to create a list with for loop: List comprehensions are an elegant way to build a list without having to use another list for loops to append values one by one. Multiple Assignment For loops For loop over the list: I never liked i=0, i+=1 structure, but if you still need to track the index: Nested lists...
I like the Cisco ISE GUI interface since 2.4, it’s pretty easy, maybe too many tabs and menus, but once you get the idea – you are good to go. I had a task of ISE migration – from one to another. We had set up 2 ISE deployments in parallel. The idea to keep everything working on ISE#1 while we...
Getting help: For more details, you can always call the built-in dir function, which returns a list of all the attributes available for a given object To get how the function actually works: Find + Replace str.isalpha() – check all characters (a-z and A-Z)str.isalnum() – check all characters (a-z, A-Z and 0-9)str.isdigit() – check all characters (0-9)str.islower(), str.isupper() Textwrap module wrap()...
Sometimes there is some mix in the configuration of the devices: some configured with TACACS, some are still with local username, but not sure with which one. I’ve created a script, that logs into the device (SSH first, if failed – Telnet), collects version and startup-config, saves it to the file and tracks the result file. I used threads in this...
Kind of Cheat Sheet for anything basic, that I did not know, have not used or interesting things, that good to know. I will keep it handy for a quick reference. I am going to create separate posts for some Python features. Strings Lists Dictionaries Functions
Working on the task came up with an idea of how to check if the A or PTR record is created for a server or domain. What if this needs to be checked in multiple DNS servers? Or if there is an issue with resolving an entry, how to check which server does nor resolve it in the DNS deployment with...
Working with network devices it’s good to check if the IP address is available (in case ICMP is allowed/enabled) before trying to get into it. Here is a quick way I found which should work in a script for both Linux and Windows: Windows: p.s.: works the same way via CMD Linux:
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