Summary of Python learning for Network Engineers Part 06 | First script using telnetlib in Python 2 & Python 3
In this video, the presenter demonstrates how to write a basic Python script using the telnetlib
library to connect to a router and retrieve output. The focus is on creating a simple script suitable for beginners, with a comparison between Python 2 and Python 3.
Key Concepts and Features:
- Telnet Library: The video covers the use of the
telnetlib
library, which allows for Telnet connections to devices. - Python Versions: The presenter uses both Python 2.7 and Python 3.6 to illustrate differences in syntax and functionality, especially concerning the
telnetlib
library. - virtual environments: The video discusses setting up virtual environments to manage different Python versions.
- Common Issues: The presenter encounters issues with the Python 2 console and resolves them by installing the
readline
tool, which is necessary for proper console input handling. - Basic Script Creation: A basic script is created to perform a Telnet connection, where the script prompts for a username and password, executes commands, and retrieves output.
- Variable Use: The presenter explains how to define variables for commands, usernames, and passwords, allowing for dynamic input.
- Encoding Differences: In Python 3, additional considerations for byte encoding and decoding are introduced, such as using
b
in front of strings and changingraw_input
toinput
. - Best Practices: The video emphasizes the importance of setting terminal length to zero to prevent the script from hanging during output retrieval.
Product Features:
- Telnet Class: The
telnetlib
provides aTelnet
class for establishing connections to Telnet servers. - Methods: The library includes various methods like
read_all()
,read_some()
, andread_very()
for handling data from the server.
Upcoming Content:
The presenter hints at future videos that will delve deeper into Python programming concepts such as modules, classes, and functions, as well as further scripting with telnetlib
.
Main Speakers/Sources:
- The presenter of the video (not named in the subtitles).
- References to Python documentation for the
telnetlib
library are mentioned.
Notable Quotes
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Category
Technology