A lot of times windows will just have the executable titled as
python.exe with no 3 even if it is 3 but the directory it is in will be labeled as 3 etc. But linux and mac have different directory structures and their binaries are labeled as python for python2.x and python3 for python3.x (of course now that 2.x is almost dead that is changing for some distros). So now you will see both python and python3 refer to python3.x.
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