Python for Beginners: Python Imports Explained Simply: Packages, Sub-packages, & Libraries 📦

Published: 18 June 2026
on channel: TrainDoc AI

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Confused by Python imports? In this beginner-friendly tutorial, we break down exactly how to navigate large Python libraries and cleanly import specific sub-packages.

Key Takeaways 📖

📦 Package vs. Library

Package: A physical folder on your computer containing code files and marked by an initialization file.

Library: A conceptual collection of reusable code that can contain one or multiple packages.

🗺️ 3 Ways to Import Sub-Packages

Using the example of accessing stats inside scipy:

🔹 Direct Import (import scipy.stats): Navigates via dot notation (.). Requires you to type the full path every time: scipy.stats.normaltest().

🔹 Aliasing (import scipy.stats as stats): Creates a short nickname (stats), letting you skip the top-level scipy package folder: stats.normaltest().

🔹 from . . . import (from scipy import stats): Pulls the stats sub-package folder directly into your notebook: stats.normaltest().

⚠️ Critical Watchouts

🛑 The Wildcard Character: Avoid blindly dumping hundreds of tools into your environment using *.

⚡ Overwriting Code: If two different libraries have sub-packages with the same name (e.g., stats), importing the second one will overwrite your original shortcut and break your code.

🚀 Master the foundations: Enroll in the full "First Steps in Python: Install, Import & Manage Libraries" course and earn your Foundational Certificate:
https://traindocai.com/courses/

Video Chapters:
0:00 Introduction
0:18 Importing a Specific Sub-Package
0:54 Drilling Deeper: Navigating with the Dot (.)
1:06 Importing Specific Sub-Packages: from...import
1:29 How to call a tool
2:04 Wildcard Character
2:36 Package vs. Library
3:05 Reading the Tree

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