print floating point number

[nilamo]

Another way, I believe,  is to add a shebang line at the beginning of the script. Then double clicking the "my_file.py" in Windows or typing "./my_file.py" in Linux with run the correct version.

Double clicking in windows works with file associations and the .py extension.  The shebang, in windows, is only used by the windows-specific python launcher, to switch to a different version of python if windows tries to use the wrong one.  It won't start python if windows doesn't already know that it should be starting python.