Why does 'python3 --version' cause a NameError in Python?

Why does "python3 --version" Show a NameError in Python?

In Python, "python3" is not recognized as a syntax within the interpreter environment. This command is meant to be executed on the command line, not within the Python prompt.

The distinction between the command line and the Python interpreter is crucial. The command line is where you issue commands outside of Python, such as launching the Python interpreter itself or installing packages. On the other hand, the Python prompt is where Python code is typed and executed.

Commonly confused command-line programs include:

• python, python2.7, python3.5, etc.
• pip or pip3
• virtualenv
• ipython
• easy_install
• django-admin
• conda
• flask
• scrapy

To check the Python version, use the following command on the command line:

python3 --version

Alternatively, you can open a terminal or console and type:

which python3

This will display the path to the Python 3 executable.

The above is the detailed content of Why does 'python3 --version' cause a NameError in Python?. For more information, please follow other related articles on the PHP Chinese website!