Python Installation Office & Personal

Download Python

https://www.python.org/downloads/

🔧 Step 1. Extract the Source

Open your terminal, cd into your Downloads folder, then run:

tar -xf Python-3.12.5.tar.xz
cd Python-3.12.5

🔧 Step 2. Install Build Dependencies

On macOS, you need Xcode tools + some libraries. Run:

xcode-select --install
brew install zlib xz bzip2 sqlite3 gdbm

🔧 Step 3. Configure Build

In the extracted Python folder:

./configure --enable-optimizations --with-openssl=$(brew --prefix openssl)

• --enable-optimizations → enables PGO/LTO → faster Python.
• --with-openssl → ensures SSL works for pip install.

🔧 Step 4. Build & Install

This step compiles Python (takes a few minutes):

make -j$(sysctl -n hw.logicalcpu)
sudo make altinstall

⚠️ Use **altinstall** instead of install → avoids overwriting macOS’s system Python.

Example:

• python3.12 will be available.
• But the system’s python3 (used by macOS) won’t be touched.

🔧 Step 5. Verify

Check version:

python3.12 --version

You should see:

Python 3.12.5

🔧 Step 6. Setup Virtual Environment

Create a project folder:

mkdir ~/llm-playground && cd ~/llm-playground
python3.12 -m venv .venv
source .venv/bin/activate

Now (venv) should show in your terminal.

🔧 Step 7. Install AI Packages

Inside your activated venv:

pip install --upgrade pip
pip install transformers torch accelerate
pip install langchain llama-index openai
pip install fastapi uvicorn[standard]
pip install sentence-transformers

✅ Done!

You now have a fresh local Python build (from source!) and are ready to run AI code.

🛠 Install Python Without sudo — For Office Laptop

1. Configure to Install Under Your Home

When you run ./configure, tell it to install into a folder inside your home directory, e.g. ~/python:

./configure --prefix=$HOME/python3.12 --enable-optimizations --with-openssl=$(brew --prefix openssl)

• --prefix=$HOME/python3.12 → this will install Python binaries into your home (safe, no root needed).
• If you don’t want to install Python in your home directory and prefer another location (for ex: /opt/python3.12), use the following command ./configure --prefix=/opt/python3.12 --enable-optimizations --with-openssl=$(brew --prefix openssl)

2. Build Python

make -j$(sysctl -n hw.logicalcpu)

This compiles Python.

3. Install Into Your Home Directory

Instead of sudo make altinstall, just run:

make altinstall

It will copy Python into $HOME/python3.12/bin/python3.12.

4. Update Your PATH

Edit your shell config (~/.zshrc if you use zsh, ~/.bashrc if bash):

export PATH="$HOME/python3.12/bin:$PATH"

Reload:

source ~/.zshrc   # or source ~/.bashrc

5. Verify

python3.12 --version

Should show:

Python 3.12.x

🚀 Next: Create Virtual Environments

Now you can make a project folder and virtual environment (no root needed):

mkdir ~/llm-playground && cd ~/llm-playground
python3.12 -m venv .venv
source .venv/bin/activate

Then install AI libraries normally:

pip install --upgrade pip
pip install transformers torch accelerate langchain llama-index fastapi uvicorn[standard] sentence-transformers

✅ This way, everything stays inside your home directory, no sudo, and your office IT Admin won’t block it.