However, you might have seen that some people use Python 2, while others prefer Python 3. If the application is written in Python 2, you may not be able to run it using Python 3. So, you should definitely know the version of Python installed on your computer. Then, for any of the operations systems above, you simply type python --version OR python -V, on the command line and press Enter.
Depending on your Python distribution, you may get more information in the result set. However, the number next to Python is the version number, which is what we are looking for. In this case, the full version number is 3. Usually, we are interested in the major version — Python 2 or Python 3. This is indicated by the first number of the full version number. This number is 3 in our case, which means that we have Python 3 installed on our computer.
Starting from Python 3. Sometimes you may want to check the version of Python when you are coding an application i. This is especially useful when you have multiple Python versions installed on your computer. To check which Python version is running, you can use either the sys or the platform module. The script will be the same for Windows, macOS, and Linux.
Both code snippets output the Python version in the string format. If necessary, you can also get the version number in the tuple format. The tuple will contain five components: major, minor, micro, release level, and serial:.
Of course, you can easily obtain the individual components of this tuple using an index e. Pretty simple, right? Note: In some cases, this will return a screen full of information. If that happens, just scan through the file locations for the word python with a number after it. That number is the version.
Python2 and Python3 are different programs. Many programs upgrade from the older version to the newer one. However, Python 2. Most systems differentiate Python 2 as python and Python 3 as python3. If you do not have Python 2, your system may use the python command in place of python3. Note : Python does not have a built-in upgrade system. When writing an application, it is helpful to have the software check the version of Python before it runs to prevent crashes and incompatibilities.
When this script runs, it will test to see if Python 3. If not, it will send a notification and displays the current Python version. Note: One of the common issues in working with Python and datasets is missing data. Learn how to handle missing data in Python. You should now have a solid understanding of how to check for the version of Python installed in several different operating systems. If you want to learn how to upgrade Python to a newer version on Wondows, macOs, and Linux, check our article how to upgrade Python to 3.
Check out this StackOverflow answer to learn the exact steps. Or you can make your life easier by using virtual environments. These let you have multiple versions of Python installed on your system.
Plus, you can switch between them instantaneously. One option is to use the built-in module venv. Installing and upgrading different Python versions is easy when you use virtual environments. For a full tutorial of virtual environments, read over our introductory Finxter blog article.
To check which version of Python 3 is installed on your computer, simply run the command python3 --version instead of python --version. Not only does Python have major, minor and micro versions. Each of those versions has further versions, namely the release level and serial. Most of the time, you will only care about the major, minor and micro releases. Release level and serial are usually for the core Python Dev team to work on changes to the language. Alpha contains the first updates made to the language.
Final is the last version and the one released to the general public. If you want to try out new features before anyone else, you can download these release levels. Serial is for the smallest changes. The Python Dev team increments it as they make changes to the alpha, beta and candidate versions. For other people to run this script, they must also run Python 3.
So you should put a check at the start to let other users know this. The assert statement raises an AssertionError if the statement is False. If the statement is True, the script continues to run. But if I am running Python 3.
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