Узнать версию питона sys

What version of Python do I have?

@TejasKale Better to run ls /usr/bin/python* (or ls /usr/bin/*python* if you really want files with python anywhere in the name). That way, ls still formats its output for a terminal (and you get multiple columns and, with the default ls alias in Ubuntu, colorization).

9 Answers 9

You can use python -V (et al.) to show you the version of Python that the python command resolves to. If that’s all you need, you’re done. But to see every version of python in your system takes a bit more.

In Ubuntu we can check the resolution with readlink -f $(which python) . In default cases in 14.04 this will simply point to /usr/bin/python2.7 .

We can chain this in to show the version of that version of Python:

$ readlink -f $(which python) | xargs -I % sh -c 'echo -n "%: "; % -V' /usr/bin/python2.7: Python 2.7.6 

But this is still only telling us what our current python resolution is. If we were in a Virtualenv (a common Python stack management system) python might resolve to a different version:

$ readlink -f $(which python) | xargs -I % sh -c 'echo -n "%: "; % -V' /home/oli/venv/bin/python: Python 2.7.4 

The fact is there could be hundreds of different versions of Python secreted around your system, either on paths that are contextually added, or living under different binary names (like python3 ).

If we assume that a Python binary is always going to be called python and be a binary file, we can just search the entire system for files that match those criteria:

$ sudo find / -type f -executable -iname 'python*' -exec file -i '<>' \; | awk -F: '/x-executable; charset=binary/ ' | xargs readlink -f | sort -u | xargs -I % sh -c 'echo -n "%: "; % -V' /home/oli/venv/bin/python: Python 2.7.4 /media/ned/websites/venvold/bin/python: Python 2.7.4 /srv/chroot/precise_i386/usr/bin/python2.7: Python 2.7.3 /srv/chroot/trusty_i386/usr/bin/python2.7: Python 2.7.6 /srv/chroot/trusty_i386/usr/bin/python3.4: Python 3.4.0 /srv/chroot/trusty_i386/usr/bin/python3.4m: Python 3.4.0 /usr/bin/python2.7: Python 2.7.6 /usr/bin/python2.7-dbg: Python 2.7.6 /usr/bin/python3.4: Python 3.4.0 /usr/bin/python3.4dm: Python 3.4.0 /usr/bin/python3.4m: Python 3.4.0 /web/venvold/bin/python: Python 2.7.4 

It’s obviously a pretty hideous command but this is again real output and it seems to have done a fairly thorough job.

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How to Check Your Python Version

Chances are you have heard about Python 2 and Python 3. Although they are two versions of the same language, they have different syntax; code written in Python 3 might not work in Python 2. So, let’s discover how you can check your Python version on the command line and in the script on Windows, macOS, and Linux systems.

Python is one of the most popular programming languages. With its simple syntax, high productivity, and amazing open-source libraries, Python can be used for just about anything.

However, you might have seen that some people use Python 2, while others prefer Python 3. The difference between these two versions is quite significant – it’s not just about fixing some bugs and adding a few new features. 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. Let’s see how you can check the Python version. We’ll start with the command line.

Check Python Version: Command Line

You can easily check your Python version on the command line/terminal/shell. Let’s first recall how we can access the command line in different operating systems.

Windows

macOS

Linux

Then, for any of the operations systems above, you simply type python —version OR python -V, on the command line and press Enter . You’ll get a result like this:

python --version Python 3.8.3 python -V Python 3.8.3

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 3.8.3.

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 3.6, you can also use python -VV (this is two Vs, not a W) to get more detailed information about your Python version:

python -VV Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)]

Check Python Version: Script

Sometimes you may want to check the version of Python when you are coding an application (i.e. inside the script). 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.

To check the Python version using the sys module, write:

import sys print (sys.version)

# 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)]

To check the Python version using the platform module, use the following code:

import platform print(platform.python_version())

The output will be as follows:

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:

print (sys.version_info) # sys.version_info(major=3, minor=8, micro=3, releaselevel='final', serial=0)

Of course, you can easily obtain the individual components of this tuple using an index (e.g. sys.version_info[0] ) or a name (e.g. sys.version_info.major ).

Pretty simple, right? No wonder Python is so popular.

Python 2 or Python 3?

Now we know how to check the Python version. But what’s the difference between the two versions?

Python 2 is an older version that was actively used in software development and IT operations (DevOps). However, it is no longer under development and has been discontinued starting from January 1, 2020. This implies that any bugs or security problems discovered in Python 2 are no longer being addressed by Python developers. Python’s volunteer developers advise that people using Python 2 move to Python 3 as soon as possible.

Python 3 was first introduced in 2008. It’s syntax and behavior is quite different from Python 2, but it’s generally believed that Python 3 is simpler and easier to understand.

As Python 2 is no longer supported, you should definitely choose Python 3 if you are writing a new application or just starting to learn Python. The only reason to learn Python 2 is if your company’s code is written in Python 2 and you need to work with it. This shouldn’t be often the case, especially once Python 2 has been discontinued for a while.

Time to Practice Python!

Do you want to learn Python 3? Join the track Learning Programming with Python on LearnPython.com, where you will be introduced to the fundamentals of programming – not just in theory but with over 400 interactive coding challenges.

The track starts with Python Basics: Part 1, a course that teaches students how to create the simplest Python applications. This course (and the track itself) are aimed at students with no prior IT background. If you are already familiar with Python’s basics, join one of the advanced courses on LearnPython.com and learn how to work with strings, JSON files, and CSV files in Python.

Professionals across different industries enjoy the benefits of this simple and effective programming language. You can join them very soon! It doesn’t take much time to become proficient in Python, especially if you plan your studying activities appropriately.

Thanks for reading, and happy learning!

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Как проверить версию Python в скриптах

1. sys.version способ проверки версии Python
2. sys.version_info способ проверки версии Python
3. Метод platform.python_version() для проверки версии на Python
4. six модульный метод проверки версии Python

В различных обстоятельствах нам необходимо знать версию Python, а точнее — версию интерпретатора Python, выполняющего файл скрипта Python.

sys.version способ проверки версии Python

Информация об этой версии может быть получена из sys.version в модуле sys .

>>> import sys >>> sys.version '2.7.10 (default, May 23 2015, 09:44:00) [MSC v.1500 64 bit (AMD64)]' 

>>> import sys >>> sys.version '3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)]' 

sys.version_info способ проверки версии Python

sys.version возвращает строку, содержащую информацию о читаемой человеком версии текущего интерпретатора Python. Но такая информация как major release number и micro release number требует дополнительной обработки для дальнейшего использования в кодах.

>>> import sys >>> sys.version_info sys.version_info(major=2, minor=7, micro=10, releaselevel='final', serial=0) 

Вы можете сравнить текущую версию со справочной просто используя операторы > , >= , == ,

>>> import sys >>> sys.version_info >= (2, 7) True >>> sys.version_info >= (2, 7, 11) False 

Мы могли бы добавить в скрипты assert , чтобы убедиться, что скрипт работает с требованием минимальной версии на Python.

import sys assert sys.version_info >= (3, 7) 

Это вызовет AssertionError , если интерпретатор не соответствует требованию версии.

Traceback (most recent call last):  File "C:\test\test.py", line 4, in module>  assert sys.version_info >= (3, 7) AssertionError 

Метод platform.python_version() для проверки версии на Python

python_version() в модуле platform возвращает версию Python в виде строки major.minor.patchlevel .

>>> from platform import python_version >>> python_version() '3.7.0' 

Или аналогично sys.version_info , platform также имеет метод возврата Python версии в виде кортежа (major, minor, patchlevel) из строк — python_version_tuple() .

>>> import platform >>> platform.python_version_tuple() ('3', '7', '0') 

six модульный метод проверки версии Python

Если вам нужно только проверить, является ли версия Python 2.x или Python 3.x, вы можете использовать six модуль для выполнения этой работы.

import six if six.PY2:  print "Python 2.x" if six.PY3:  print("Python 3.x") 

Founder of DelftStack.com. Jinku has worked in the robotics and automotive industries for over 8 years. He sharpened his coding skills when he needed to do the automatic testing, data collection from remote servers and report creation from the endurance test. He is from an electrical/electronics engineering background but has expanded his interest to embedded electronics, embedded programming and front-/back-end programming.

Сопутствующая статья — Python Version

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How to Check Your Python Version (Windows, macOS, Linux)

In this tutorial, you’ll learn how to check your Python version in Windows, macOS, and Linux. You’ll learn how to check the version of Python using the command line and within a Python script itself. You’ll learn how to get the version number of the interpreter that your scripts will use.

Knowing how to do this is an important skill for any Python developer. For example, it can be an important skill in order to better troubleshoot your code. If your interpreter is set to a different version than you’re expecting (say, Python 2 versus Python 3), being able to identify the version of the interpreter can help troubleshoot your problems.

By the end of this tutorial, you’ll have learned:

• How to check the Python version of your interpreter in Windows, Mac OS, and Linux
• How the check the Python version while running your script
• How to access the major, minor and micro versions of your Python version programmatically

How to Check Your Python Version

To check the version that your Python interpreter is running we can use a version command on the python command. Because accessing the command line prompt or terminal varies from system to system, this part of the tutorial is split across the different operating systems available to you.

Over the following sections, you’ll learn how to check your Python version using Windows 10, Windows 7, macOS, and Linux.

How to Check Your Python Version on Windows 10

In Windows 10, we can use the PowerShell to check the version of Python that we are running. In order to access the PowerShell, simply use the following steps:

Once the PowerShell is open you can access the Python version your interpreter is running by writing the commands shown below.

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