Basics of python programming

Basics of python programming

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  Basics of Python Programming -ByAditi Bhushan Aditi Bhushan 1
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  UNIT – 2:PYTHON [REVISED SYLLABUS] • TOTAL = 25/100 • Basics of Python programming, • Python interpreter - interactive and script mode, • the structure of a program, • indentation, • identifiers, keywords, constants, variables, • types of operators, precedence of operators, • data types, mutable and immutable data types, • statements, expressions, evaluation and comments, input and output statements • data type conversion, • debugging. • Control Statements: if-else, for loop • Lists: list operations - creating, initializing, traversing and manipulating lists, list methods and built-in functions. • Dictionary: concept of key-value pair, creating, initializing, traversing, updating and deleting elements, dictionary methods and built-in functions. Aditi Bhushan 2
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  Introduction to Python VersionPython 3 or Python 3.7.0 or Latest Version: Python 3.8.5 Aditi Bhushan 3
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  Why Python? (forunderstanding purpose, not for evaluation) • Powerful Language • Supports “Scripting Language” • Concise Formatting Style of Language • Every Value is an Object. • Supports iteration and abstractions – thereby making generics easy with dynamic typing Aditi Bhushan 4
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  Language Features (forunderstanding purpose, not for evaluation) • Supports Indentation instead of braces • Powerful subscripting (slicing) • Functions are independent entities (not all functions are methods) • Exceptions as in Java • Simple object system • Iterators (like Java) and generators • Several sequence types • Strings ’…’: made of characters, immutable • Lists […]: made of anything, mutable • Tuples (…) : made of anything, immutable Aditi Bhushan 5
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  Basics of Python •Created by Guido van Rossum in 1991 • Object Oriented Programming • Uses: software development, web development, scientific computing, big data and artificial intelligence • Download Latest Version of Python IDE from: https://www.python.org/ • Online Editor for Python: https://www.onlinegdb.com/online_python_compiler Aditi Bhushan 6
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  Installation • Python ispre-installed on most Unix systems, including Linux and MAC OS X • Python comes with a large library of standard modules • There are several options for an IDE • IDLE – works well with Windows • Emacs with python-mode or your favorite text editor • Eclipse with PyDev (http://pydev.sourceforge.net/ ) • PyCharm (https://www.jetbrains.com/pycharm/) Aditi Bhushan 7
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  Starting with Python InstallationSteps (Please Find attached the Pics) 1. Put a tick mark on Add Path Aditi Bhushan 8
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  2. Change CustomPath (Optional) Aditi Bhushan 9
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  IDLE Development Environment •IDLE is an Integrated DeveLopment Environment for Python, typically used on Windows • Multi-window text editor with • syntax highlighting, • auto-completion, • smart indention • Integrated debugger with • stepping, • persistent breakpoints, • call stack visibility Aditi Bhushan 10
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  Windows IDLE Aditi Bhushan11 To write and run (execute) a Python program, we need to have a ✓ Python interpreter installed on our computer or ✓ any online Python interpreter. The interpreter is also called Python shell. Python Interpreter Here, the symbol >>> is called Python prompt, which indicates that the interpreter is ready to receive instructions.
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  Execution Modes INTERACTIVE MODE •Single line code for instant execution. • Good for beginners at starting. • We cannot save the statements for further use. SCRIPT MODE • Python Program/Scripts are written and saved with .py extension. • Good for bigger programs or professionals. • We can Save and Reuse them. Consist of built-in editors known as IDLE. • By default, the Python scripts are saved in the Python installation folder. Aditi Bhushan 12
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  COMMENTS • Start commentswith #, rest of line is ignored • Can include “string” as the first line of a new function. • Development environments, debugger, and other tools use it: it’s good style to include one def fact(n): “““fact(n) assumes n is a positive integer and returns factorial of n.””” assert(n>0) return 1 if n==1 else n*fact(n-1) Aditi Bhushan 13