Скачать или смотреть How to Manage pytest Executable Scripts Across Different Python Versions

This article explains how to manage and invoke executable scripts like `pytest` when multiple versions of Python are installed, ensuring you run the desired version easily.
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Understanding Executable Scripts with Python's pip

Managing different versions of Python on your system can often lead to confusion, especially when it comes to executing scripts like pytest. With the use of pip, you can install packages specific to each Python version, but invoking the correct version can sometimes be a challenge.

The Problem

Let's say you've got Python 3.10 and Python 3.11 installed on your machine. You install the scripting tool pytest using the commands:

[[See Video to Reveal this Text or Code Snippet]]

and later:

[[See Video to Reveal this Text or Code Snippet]]

Now, when you type pytest in the command line, how do you know which version of pytest is being invoked? Here, we'll explore the answer to this common dilemma.

Solution Overview

When you run the command pytest without specifying a Python version, your shell will utilize the default Python version configured in your system's environment variable $PATH. This can lead to ambiguity if you have multiple Python versions installed, as only one will be recognized by default.

Steps to Identify and Use the Correct pytest

Default Python Identification:

To check which version of pytest is being invoked, you can simply run:

[[See Video to Reveal this Text or Code Snippet]]

This command will execute the pytest version linked to your system's default Python interpreter.

Running pytest with Specific Python Versions:

If you want to run pytest from the Python 3.10 installation, you'd specify it explicitly:

[[See Video to Reveal this Text or Code Snippet]]

Conversely, for Python 3.11, you would use:

[[See Video to Reveal this Text or Code Snippet]]

Key Takeaways

Understanding $PATH:

Your system's $PATH variable determines which executable is run when you type a command. It’s essential to have the correct Python version in the PATH that you wish to use.

Explicit Invocation:

Always specify the version of Python when you are unsure, especially when working with multiple installations. This ensures that you are invoking the pytest from the correct environment.

Consistency Across Scripts:

The principles mentioned apply to any executable script you install via pip, not just pytest. You can use the same commands for other packages as needed.

Conclusion

Managing multiple versions of Python requires a good understanding of your environment, especially when it comes to executable scripts. By following these guidelines, you can confidently run the desired version of scripts installed via pip, ensuring your development environment functions smoothly.

Remember, when in doubt, specify the Python version to avoid any potential conflicts!