Windows Python Installation & Package Size Analyzer

A standalone, production-grade Python utility designed for Windows systems to scan, detect, and analyze all installed Python interpreters and calculate the precise disk usage of packages in their site-packages directory.

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Features

• Multi-Source Python Detection:
  • Windows Registry (HKCU and HKLM under Software\Python\PythonCore).
  • Python Launcher (py -0p).
  • System PATH environment variable.
  • Common installation directories (%LocalAppData%\Programs\Python, %ProgramFiles%\Python, C:\Python*).
  • Anaconda, Miniconda, and Mamba environments.
  • Virtual environments (.venv, venv, env directories searched locally and in user profile).
• Accurate Disk Usage Calculation:
  • Runs in a subprocess inside the target interpreter to extract package versions and files using importlib.metadata.
  • Fallback to offline directory scanning via a fast, non-recursive folder size calculator if the interpreter is broken or incompatible.
• Visual Terminal Interface:
  • Clean, ANSI-colored output showing a table of packages sorted by size in descending order.
  • Highlights the 20 largest packages for each Python installation.
  • Displays total disk space used by all packages for each interpreter.
• Data Export:
  • Automatically exports the complete analysis results to a CSV file.
• Safety First:
  • Entirely read-only; does not modify, update, or delete any files or packages.
  • Handles permission errors, missing directories, and symbolic links gracefully.

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Requirements

• Operating System: Windows (CMD or PowerShell)
• Python Version: Python 3.9+ (compatible with the running interpreter)

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Quick Start

1. Clone or download the repository.
2. Run the script from PowerShell or CMD:

python analyze_pythons.py

Command-Line Arguments

Argument	Description	Default
--csv <path>	Path where the CSV report will be saved	python_packages_report.csv
--limit <num>	Number of largest packages to highlight per installation	20
--all	Show all packages in the terminal, bypassing the limit	False

Example of showing all packages:

python analyze_pythons.py --all

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Example Output

============================================================
  Windows Python Installation & Package Size Analyzer
============================================================
Searching for Python installations on your system...
Found 3 Python interpreter(s). Analyzing package sizes...
  [OK] Analyzed: Python 3.11.7 (C:\Users\...\Python311\python.exe)
  [OK] Analyzed: Python 3.14.6 (C:\Python314\python.exe)

============================================================
  ANALYSIS RESULTS
============================================================

Python 3.11.7
Path: C:\Users\...\Python311\python.exe
Total package size: 2.93 GB
------------------------------------------------------------
Package                   Version      Size         Path
------------------------------------------------------------
torch                     2.8.0        1.24 GB      ...\site-packages\torch-2.8.0.dist-info
catboost                  1.2.8        360.3 MB     ...\site-packages\catboost-1.2.8.dist-info
scipy                     1.16.2       136.9 MB     ...\site-packages\scipy-1.16.2.dist-info
transformers              4.57.1       106.8 MB     ...\site-packages\transformers-4.57.1.dist-info
... and 197 more packages.

============================================================
Report successfully exported to CSV:
  C:\Users\...\python_packages_report.csv
============================================================

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License

This project is open-source and available under the MIT License.