Python Programming Basics

Python Programming for Beginners

This documentation provides a comprehensive overview of Python programming, suitable for beginners and those looking to deepen their understanding.

Introduction to Python Programming

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Python is a high-level, interpreted, interactive, and object-oriented programming language celebrated for its simplicity and readability. Its syntax prioritizes clarity, which significantly reduces the cost of program maintenance, making it an excellent choice for both novice and seasoned developers.

Key Features of Python

• Interpreted Language: Python code is executed line-by-line by an interpreter at runtime. This eliminates the need for a separate compilation step, similar to languages like PHP and PERL.

• Interactive Environment: Python allows for direct interaction with the interpreter via the command line or interactive shells like IPython. This facilitates rapid testing and debugging of code snippets.

• Object-Oriented: Python fully supports object-oriented programming (OOP) principles, which promote code reusability and modularity by encapsulating functionality within objects.

• Beginner-Friendly: With its clear syntax and versatility, Python is an ideal first programming language and is widely taught in educational institutions.

• Cross-Platform and Open Source: Python is open-source and runs on all major operating systems, including Windows, Linux, and macOS. It is distributed under the Python Software Foundation License, which is compatible with the GNU General Public License (GPL).

• Readable Syntax: Python's syntax emphasizes human readability, utilizing English-like keywords and minimal punctuation. This distinguishes it from many other programming languages.

Development and Evolution

Python was created by Dutch programmer Guido van Rossum in December 1989 as a hobby project at the Centrum Wiskunde & Informatica (CWI) in the Netherlands. The name "Python" was inspired not by the snake, but by the British comedy group Monty Python's Flying Circus.

Major Milestones in Python's History

• Python 0.9.0 (1991): The first official release, introducing classes, exception handling, and core data types like lists and dictionaries.

• Python 1.0 (1994): Incorporated functional programming features, support for complex numbers, and a modular system for better code organization.

• Python 2.0 (2000): Introduced significant enhancements such as list comprehensions, garbage collection, and Unicode support. During this era, libraries like NumPy, SciPy, and Django greatly contributed to Python's growing popularity.

• Python 3.0 (2008): Represented a major overhaul aimed at rectifying legacy inconsistencies. While not backward-compatible, tools like python2to3 were provided to aid the transition. Key features included improved Unicode support and refined division behavior.

• End of Life for Python 2.x (2020): Python 2.7.17 was the final release, with official support concluding on January 1, 2020. This pivotal shift redirected all development efforts towards the Python 3.x series.

Python Software Foundation (PSF)

After stepping down as the "Benevolent Dictator for Life" (BDFL) in 2018, Guido van Rossum transitioned Python's leadership to the broader community, guided by the Python Software Foundation (PSF). The PSF now oversees the language's development and manages its intellectual property.

Recent Developments

As of February 2023, the latest stable release is Python 3.11.2. Notable highlights of this version include:

• Performance Boost: Python 3.11 offers up to a 60% speed improvement over previous versions, with an average performance gain of around 25%.

• Enhanced Error Messages: Improved tracebacks now clearly highlight the exact expression causing exceptions, significantly simplifying the debugging process.

Future of Python

Python continues its evolution with a strong emphasis on performance, developer experience, and the demands of modern applications. It is widely adopted across diverse domains, including:

• Artificial Intelligence & Machine Learning

• Data Science & Analytics

• Web Development

• Automation and Scripting

• Scientific Computing

Learning Path: Articles

This section outlines a structured path for learning Python, covering essential concepts and advanced topics.

1. Python Variables & Data Types

• 1.1 Python Variables

• 1.2 Python Data Types

• 1.3 Python Numbers

• 1.4 Type Casting in Python

• 1.5 Python Strings

• 1.6 Python String Methods

• 1.7 Python Boolean

2. Python Control Statements

• 2.1 Python If else

• 2.2 Python Loops

• 2.3 Python For loop

• 2.4 Python While Loop

• 2.5 Python Continue

• 2.6 Python Break

• 2.7 Python Pass

3. Python Data Structures

• 3.1 Python Lists

• 3.2 Python List methods

• 3.3 Python Tuples

• 3.4 Python Tuple Methods

• 3.5 Difference between list and tuple

• 3.6 Python Sets

• 3.7 Python Set Methods

• 3.8 Python Dictionary

• 3.9 Python Dictionary Methods

• 3.10 Difference between List and dictionary

• 3.11 Difference between List, Set, Tuple, and Dictionary

• 3.12 Difference between sets and dictionary

4. Python Functions

• 4.1 Python built-in functions

• 4.2 def functions

• 4.3 Python Lambda functions

5. Python Modules

• 5.1 Python List Comprehension

• 5.2 Python Collection Module

• 5.3 Python Math Module

• 5.4 Python OS Module

• 5.5 Python Random Module

• 5.6 Python Statistics Module

• 5.7 Python Sys Module

6. Python OOPs Concepts

• 6.1 Python OOPs Concepts

• 6.2 Python Classes and Objects

• 6.3 Constructors

• 6.4 Inheritance

• 6.5 Abstraction

• 6.6 Encapsulation

• 6.7 Access Modifiers

7. Exception Handling

• 7.1 Exception Handling

• 7.2 How to catch multiple exceptions

• 7.3 Raise an Exception

• 7.4 finally keyword

• 7.5 Built-in Exceptions

8. File Handling

• 8.1 Python Files I/O

• 8.2 Read CSV file

• 8.3 Write CSV File

• 8.4 Read from File

• 8.5 Write to File

• 8.6 JSON

• 8.7 Context Managers in Python

9. Python Searching and Sorting

• 9.1 Searching algorithms

• 9.2 Linear search

• 9.3 Binary search

• 9.4 Sorting algorithms

• 9.5 Bubble Sort

• 9.6 Insertion Sort

• 9.7 Selection Sort

• 9.8 Merge Sort

• 9.9 Quick Sort

• 9.10 Heap Sort

• 9.11 Tim Sort

Advanced Topics

• Grid Search in Python

• NSE tools in Python

• Python High Order Functions

• Arrays

• Assert

• Command Line Arguments

• Data

• Decorators

• Generators

• Gmail API in Python

• How to Plot Google Maps using Folium package in Python

• IDEs

• Iterator Tools

• Multiprocessing

• PySpark MLlib

• Python Magic Methods

• Python Stacks and Queues

• Regex

• Sending Email

• Web Scraping

Libraries

This section delves into essential Python libraries for data science, visualization, and scientific computing.

Libraries – NumPy

NumPy (Numerical Python) is a fundamental package for scientific computing with Python.

• Introduction

• Ndarray Object

• Array Creation

  • Array from Existing Data

• Array Attributes

• Data Types

• Indexing

• Slicing

  • Slicing with Boolean Arrays

• Array Manipulation

  • Splitting Arrays

  • Stacking Arrays

• Arithmetic Operations

  • Binary Operations

  • Byte Swapping

  • Element-Wise Array Comparisons

• Mathematical Functions

  • Exponential Functions

  • Hyperbolic Functions

  • Logarithmic Functions

• Statistical Functions

  • chi-square Distribution

  • Logistic Distribution

• Filtering and Joining Arrays

• Polynomial Operations

  • Polynomial Representation

• String Functions

• Union Arrays

• Visualize Distribution with Seaborn

• Environment

Libraries – Matplotlib

Matplotlib is a comprehensive library for creating static, animated, and interactive visualizations in Python.

• Introduction

• Pyplot API

• Simple Plot

• Markers and Figures

• ColorMaps and their Normalization

• Scales

• Working with Text

  • text Properties

  • Font Indexing

  • Font Properties

  • Fonts

  • LaTex

  • LaTex Text Formatting in Annotation

• Images

  • Image Masking

• Mathematical Expressions

• Plotting with Keywords

• Object-Oriented Interface

• Subplots

  • Subplots() Function

  • Subplot Titles

  • Subplot2Grid() Function

• Annotated Cursor

• Cursor Widget

• Mouse Cursor

• Toolkits

• Buttons Widget

• Menu Widget

• Radio Buttons

• Slider Widget

• Range Slider

• Ribbon Box

• Polygon Selector

• 3D Plots

  • 3D Bar Plots

  • 3D Scatter Plots

• Plot Types

  • Area Plot, Bar Plot

  • Box Plot

  • Heat Map

  • Histogram

  • Line Plot

  • Pie Chart

  • Scatter Plot

• Matplotlib vs Seaborn

• Jupyter Notebook

• Anaconda Distribution

• print Stdout

• Multi cursor

• Multiprocessing

Libraries – Pandas

Pandas is a powerful, flexible, and easy-to-use open-source data analysis and manipulation tool built on top of the Python programming language.

• Introduction

• Series and Attributes of Series

  • Slicing a Series Object

• DataFrame

  • Accessing DataFrame

  • Arithmetic Operations on DataFrame

  • Modifying DataFrame

• Indexing and Selecting Data

  • Boolean Indexing

  • Boolean Masking

  • Basics of Multi-Index

  • Indexing with MultiIndex

• I/O Tools

  • Reading and Writing Data to Excel

• Iteration & Concatenation

• Removing Rows from a DataFrame

• Sorting and Reindexing

• Categorical Data

  • Comparing Categorical Data

  • Computing Dummy Variables

  • Ordering and Sorting Categorical Data

• Pivoting

• Stacking and Unstacking

• Handling Missing Data

  • Calculations in Missing Data

  • Dropping Missing Data

  • Filling Missing Data

  • Interpolation of Missing Values

• Handling Duplicate Data

• Counting and Retrieving Unique Elements

Library – SciPy

SciPy (Scientific Python) is a library used for scientific and technical computing. It builds on the NumPy library.

• Introduction and Basic Functionalities

• Relationship with NumPy

• Mathematical Constants

• Physical Constants

• Unit Conversion

• Integration Module

  • Single Integration

  • Double Integration

  • Triple Integration

  • Multiple Integration

  • Integration of Ordinary Differential Equations

  • Integration of Stochastic Differential Equations

  • Oscillatory Functions

  • Discontinuous Functions

• Fast Fourier Transform (FFT)

  • FFT Pack

  • Discrete Fourier Transform

• Statistical Distributions

  • Continuous Probability Distribution

  • Discrete Probability Distribution

• Clustering

  • Hierarchical Clustering

  • K-Means Clustering

• Interpolation

  • Linear 1-D Interpolation

  • Polynomial 1-D Interpolation

• Curve Fitting

  • Linear Curve and Non-Linear Curve Fitting

• Statistical Tests and Inference

• Distance Metrics

• Constants

Python Interview Questions

Prepare for Python interviews with these resources:

• For Experienced Professionals

• For Freshers

• Programs for Interview Preparation

This documentation aims to provide a solid foundation for learning and mastering Python. Happy coding!