Interpreter Installation

Overview

The Python interpreter is the runtime that executes your .py scripts. Installing the right version (3.10+) and verifying it via terminal ensures your code behaves consistently across all machines — critical for reproducibility in teams.

Syntax

bash

# Check Python version
python3 --version      # macOS/Linux
python --version       # Windows

# Run a script
python3 script.py

# Interactive REPL
python3

Common Pitfalls

On macOS, 'python' may still point to Python 2.7 — always use 'python3' explicitly.
Use pyenv to manage multiple Python versions without conflicts: pyenv install 3.11.0 && pyenv global 3.11.0.
Interview tip: Interviewers expect you to know python3 vs python distinction and how to check the active interpreter path with 'which python3'.

Real-World Example

Set up Python 3.11 and run a hello world script from terminal

example

bash

# Install (macOS via Homebrew)
brew install python@3.11

# Confirm version
python3.11 --version   # Python 3.11.x

# Run script
python3.11 hello.py

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