When installing packages using pip in AWS Cloud9, you may encounter a situation where the installation is directed to Python 2.7 instead of Python 3.6. This can be frustrating, especially if you are working with Python 3.6-specific features or libraries. However, there are several ways to solve this issue and ensure that pip installs packages for Python 3.6.
Option 1: Using Python 3’s pip
The simplest solution is to explicitly use Python 3’s pip when installing packages. You can do this by running the following command:
python3 -m pip install package_name
This command ensures that the package is installed for Python 3.6 specifically. By using the
python3 command, you are invoking the Python 3 interpreter, and the
-m flag tells Python to run the specified module as a script. In this case, the module is
pip, and you can then proceed to install the desired package.
Option 2: Virtual Environments
Another approach is to create a virtual environment specifically for Python 3.6 and install packages within that environment. This ensures that any package installations are isolated to the Python version you desire. Here’s how you can do it:
python3 -m venv myenv
pip install package_name
In this solution, we first create a virtual environment named
myenv using the
python3 -m venv command. Then, we activate the virtual environment using the
source command. Finally, we can use pip to install the desired package, which will be installed within the virtual environment and associated with Python 3.6.
Option 3: Specifying Python Version in Pip Command
If you prefer not to use virtual environments, you can also specify the Python version directly in the pip command. Here’s how:
pip3.6 install package_name
pip3.6 instead of just
pip, you are explicitly telling pip to install the package for Python 3.6. This ensures that the package is installed in the correct Python version, regardless of any default settings or configurations.
After considering these three options, the best approach depends on your specific requirements and preferences. If you are working on a project that requires Python 3.6, using Python 3’s pip or virtual environments are recommended. These options provide better isolation and ensure that your project remains compatible with Python 3.6. However, if you only need to install a package for Python 3.6 without any further project requirements, specifying the Python version in the pip command can be a quick and straightforward solution.