如何安装64位Python以使其能够使用全部内存？

Hey there! I’ve been through this exact scenario before—here’s a straightforward, step-by-step guide to switch from the 32-bit Python you’re using to the 64-bit version, so you can leverage all your system’s memory:

1. Confirm Your Current Python Architecture #

First, double-check that you’re actually running a 32-bit build. Open your terminal (command prompt on Windows, Terminal app on macOS/Linux) and run:

python --version
# Or python3 --version if that's your default

If the output includes (32-bit), you’re ready to make the switch. If it says (64-bit), you might already have what you need—try running import sys; print(sys.maxsize) in a Python shell; 64-bit will show a value like 9223372036854775807, while 32-bit shows 2147483647.

2. Uninstall the 32-bit Python Version #

• Windows: Open Control Panel → Programs → Programs and Features. Find your Python 3.x (32-bit) entry, right-click it, and select Uninstall. Follow the wizard to remove it completely.
• macOS: Navigate to your Applications folder, find the Python 3.x folder (matching your current version), drag it to the Trash. You can also run sudo rm -rf /Library/Frameworks/Python.framework/Versions/3.x in Terminal to clean up leftover files (replace 3.x with your version number).
• Linux: Use your system’s package manager. For Ubuntu/Debian-based distros, run sudo apt remove python3.x (again, replace 3.x with your version). If you installed from source, delete the installation directory and update your PATH if needed.

3. Download the 64-bit Python Installer #

Head to the official Python download page and grab the 64-bit installer for your operating system:

• Windows: Look for the "Windows x86-64 executable installer" option (match the same major/minor version as your previous install, e.g., 3.11.x if you were on 3.11).
• macOS: Choose the "macOS 64-bit universal installer" (or the x86-64 specific one if you’re on an older Intel Mac).
• Linux: Pick the x86_64 package for your distro, or use your package manager to install the 64-bit version directly (most modern Linux distros default to 64-bit, so this might just be sudo apt install python3.x).

4. Install the 64-bit Python #

• Windows: Run the installer, make sure to check the box that says "Add Python to PATH" (critical for making it your default Python), then choose "Install Now" (or custom install if you want to tweak locations).
• macOS: Open the downloaded .dmg file, drag the Python icon to your Applications folder, then run the installer to complete setup.
• Linux: Follow your distro’s package installation instructions—for source installs, extract the tarball, run ./configure --enable-optimizations, make, and sudo make install.

5. Verify the Switch Worked #

Open a new terminal window (important—old terminals might still have cached PATH values) and run:

python --version

You should see (64-bit) in the output. To confirm memory access, open a Python shell and run:

import sys
print(sys.maxsize)

The large value (around 9e18) confirms you’re on 64-bit and can access all your system’s RAM.

Quick Notes to Avoid Headaches #

• Virtual Environments: Any existing virtual environments were built with 32-bit Python—you’ll need to delete them and create new ones with the 64-bit version.
• Third-Party Libraries: Reinstall any pip packages you were using, since 32-bit and 64-bit library files aren’t compatible. Run pip list to get a list of your current packages, then reinstall them with the new Python.

内容的提问来源于stack exchange，提问作者user8866053