PYTHON3 PART-2

Keywords in python:

• Python has a set of keywords that are reserved words that cannot be used as variable names, function names, or any other identifiers.

Core Rules for Python Keywords:

• case sensitive
• immutable
• version dependent

to list the python keywords in idle use this command:

import keyword
keyword.kwlist

keywords:
['False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield']

Data types in python:

• Data types in Python define the type of value stored in a variable.
• it also determine the operations that can be performed on that data.

1. Numeric Types:

• int - positive or negative numbers
• float - numbers with a floating decimal points
• complex - Numbers with a real and an imaginary part

2. str type:

• str - text data inside double or single quotes

3. sequence type:

• list - mutable(changeable)
• tuple - immutable(unchangeable)
• range - generates a sequence of numbers

4. Mapping Type:

• dict - Dictionaries that store data in key-value pairs.

5. Set Types:

• set - mutable(changeable)
• frozen set - immutable(unchangeable)

6. Boolean Type:

• bool - True or False.

7. None Type:

• none - represents the keyword none.

Editing tool tasks

1. how to create a file using cat command?

• first open terminal
• then type this command
• cat>filename.txt
• then press enter
• then type your content on terminal
• save and exit using ctrl+D.

2. how to create two files using cat command?

• first open terminal
• then type this command
• cat > file1.txt ; cat > file2.txt
• then press enter
• then type your content on terminal,it will shows in file1.txt
• save and exit using ctrl+D it saves the content in file1.txt,and then it will automatically enter into file2.txt in terminal
• then type your content on terminal, it will shows in file2.txt
• save and exit using ctrl+D it saves the content in file2.txt

3.how to merge two files using cat command?

• first open the terminal
• then type this command
• cat file1.txt file2.txt > new_merged_file.txt
• this command merge the both files and stores in another file.

Linux commands:

• cd: Changes the current directory.
• mkdir: Creates a brand new directory.
• ls: Lists all files and folders in the current directory.
• rm: Deletes files permanently.
• pwd: Prints the current working directory path.
• mv: Moves or renames files and directories.
• cp: Copies files or directories from a source to a destination.
• cat: Displays the entire contents of a file in the terminal.

Client-Side (The Front End):

• The client side is everything that a user interacts with directly.
• The "client" is typically a web browser or a mobile app running on a laptop, smartphone, or tablet.

Server-Side (The Back End):

• The server side consists of everything happening behind the scenes on a remote, centralized computer system.

Framework:

• A framework is a pre-built structure, template, or set of guidelines that helps people—especially software creators—build projects faster without starting from scratch.

types:

• angular
• react
• django
• springboot
• flutter

OpenJDK:

• OpenJDK is a free and open-source implementation of the Java Platform, Standard Edition (Java SE).
• it is managed via the official OpenJDK Project and released under the GNU General Public License.

features:

• Free and Open-Source
• Reference Implementation

OSI layer:

Programming languages advantages:

• c --> compiler,os,Maximum execution speed, hardware control.
• c++ --> gaming applications, payment gateway,Object-oriented performance.
• php --> Built for web servers, massive ecosystem,content management system.
• java --> Enterprise software, Android apps,performance,security.
• python --> Clean syntax, AI/data science libraries,Machine learning, data analytics, scripting.
• javascript --> Interactive web pages, full-stack applications.

References:

w3schools.com

What is OSI Model | 7 Layers Explained | Imperva

The OSI model describes seven layers that computer systems use to communicate over a network. Learn about it and how it compares to TCP/IP model.

imperva.com