WRITING THE PROGRAM

Writing the Program

Writing the Program

Blog Article

A Python program works by executing a sequence of instructions written in the Python programming language. Here's a breakdown of how it works: TRENDZ Exhibitions



1. Writing the Program


You write the Python code using a text editor or an Integrated Development Environment (IDE) like PyCharm, VS Code, or Jupyter Notebook. Python files typically have a .py extension.

Example:

python






# This is a simple Python program print("Hello, World!")





2. Interpreting the Code


Python is an interpreted language, meaning it executes code line-by-line rather than compiling the entire program first. The Python interpreter processes your script.

Steps:

  1. Source Code → Written by you in .py.

  2. Tokenizer → Breaks the code into smaller components called tokens.

  3. Parser → Organizes tokens into a structure (Abstract Syntax Tree).

  4. Interpreter/Bytecode → Translates the parsed code into bytecode for the Python Virtual Machine (PVM).





3. Execution


The Python Virtual Machine (PVM) executes the bytecode. It translates it into machine code that your computer hardware can understand and run.



4. Example Workflow


Code:



python






# Input from the user name = input("What's your name? ") print(f"Hello, {name}! Welcome to Python programming.")


Process:



  1. Line 1: input() waits for user input (e.g., user types "Mujeeb").

  2. Line 2: print() displays the formatted string with the user's input.

    • Output: Hello, Mujeeb! Welcome to Python programming.







5. Error Handling


Python identifies syntax errors or runtime errors during execution and raises appropriate exceptions, such as:

  • SyntaxError: Code syntax is invalid.

  • TypeError: Operation is applied to the wrong type.

  • ValueError: Invalid value provided.


Example:

python






print("Hello") # Correct syntax print "Hello" # SyntaxError: Missing parentheses in call to 'print'





6. Libraries and Modules


Python programs often use built-in libraries or external modules. For example:

python






import math print(math.sqrt(16)) # Output: 4.0





7. Running the Program



  • Command Line/Terminal: Run using python myfile.py.

  • Interactive Mode: Directly execute code line-by-line in a Python shell.

  • IDE: Click "Run" to execute the script.

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