I've written some scripts, which run either only with Version 2.x or some only with Version 3.x of Python.
How can I detect inside the script, if it's started with fitting Python Version?
Is there a command like:
major, minor = getPythonVersion()
To check your Python version, run python ‐‐version in your command line (Windows), shell (Mac), or terminal (Linux/Ubuntu). To check your Python version in your script, run import sys to get the module and use sys. version to find detailed version information in your code.
Python is probably already installed on your system. To check if it's installed, go to Applications>Utilities and click on Terminal. (You can also press command-spacebar, type terminal, and then press Enter.) If you have Python 3.4 or later, it's fine to start out by using the installed version.
Python 3 is more in-demand and includes a typing system. Python 2 is outdated and uses an older syntax for the print function. While Python 2 is still in use for configuration management in DevOps, Python 3 is the current standard. Python (the code, not the snake) is a popular coding language to learn for beginners.
sys.version_info
provides the version of the used Python interpreter.
Python 2
>>> import sys
>>> sys.version_info
sys.version_info(major=2, minor=7, micro=6, releaselevel='final', serial=0)
>>> sys.version_info[0]
2
Python 3
>>> import sys
>>> sys.version_info
sys.version_info(major=3, minor=7, micro=10, releaselevel='final', serial=0)
>>> sys.version_info[0]
3
For details see the documentation.
You can use the six library (https://pythonhosted.org/six/) to make it easier to write code that works on both versions.
(It includes two booleans six.PY2
and six.PY3
which indicate whether the code is running in Python 2 or Python 3)
Also in Python 2.6 and 2.7, you can use
from __future__ import (print_function, unicode_literals, division)
__metaclass__ = type
to enable some of the Python 3 behaviour in a way that works on both 2 and 3.
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