As the question asks, I want to be sure that the script is executed by a specific version of python, say =>3.5.2.
How can I make sure that the script when executed is called by the specific version.
This check should be done in the python script itself.
It could be better if the solution is platform independent.
Just add this to the start of your script:
import sys
assert sys.version_info >= (3, 5, 2), "Python version too low."
Or if you prefer without assert:
import sys
if sys.version_info < (3, 5, 2):
raise EnvironmentError("Python version too low.")
Or little bit more verbosely, but this will actually inform what version is needed:
import sys
MIN_VERSION = (3, 5, 2)
if sys.version_info < MIN_VERSION:
raise EnvironmentError(
"Python version too low, required at least {}".format(
'.'.join(str(n) for n in MIN_VERSION)
)
)
Example output:
Traceback (most recent call last): File "main.py", line 6, in <module> raise EnvironmentError( OSError: Python version too low, required at least 3.5.2
The specified minimum version tuple can be as precise as you want. These are all valid:
MIN = (3,)
MIN = (3, 5)
MIN = (3, 5, 2)
assert sys.version_info >= (3, 8) yields SyntaxError: invalid syntax on older python because I'm using the walrus operator (much later in the code).main.py before you import any code that uses newer Python syntax.You can check the version by calling sys.version_info. This will give you a tuple in the form sys.version_info(major=3, minor=6, micro=5, releaselevel='final', serial=0).
sys.version_info with what you want. sys.version_info will give you information about what version of python is currently being run.sys.version_info.major >= 3 and sys.version_info.minor >= 5 and sys.version_info.micro >= 2 (although this isn't exactly the boolean expression you want, you still have to add checks for e.g. 3.6.1)Try:
if not sys.version_info >= (3, 5, 2):
raise EnvironmentError()
Or, better still, some custom exception with a useful message,
