我下载了 Python 3.9 但是好像什么都没发生

Question

Ok, I'm trying to install python 3.9 in my computer. The only thing I know about computers is programming, and I'm starting with Python. I really don't understand much of anywhere before that, so that's why I couldn't get what I'm looking for in other StackOverflow questions and so on. I have a hard time in that. Therefore, I'll describe exactly what I did:

I went to https://www.python.org/ and downloaded Python 3.9 (that button in the middle).

After it finished downloading, I opened it and went through the installation window. After it was done, I went to my Terminal (after I figured out what it was) and typed which python . This is where the problem starts; I got a pretty neutral return (just the path):

/usr/bin/python

After that, I did python . Then there was a problem:

WARNING: Python 2.7 is not recommended. This version is included in macOS for compatibility with legacy software. Future versions of macOS will not include Python 2.7. Instead, it is recommended that you transition to using 'python3' from within Terminal.

Python 2.7.16 (default, Apr 17 2020, 18:29:03) [GCC 4.2.1 Compatible Apple LLVM 11.0.3 (clang-1103.0.29.20) (-macos10.15-objc- on darwin Type "help", "copyright", "credits" or "license" for more information.

All I understand is that the computer still has Python 2.7.16 installed (which, if I understand correctly, is a default for Mac), and not the 3.9. In the tutorial I was watching, this didn't happen... What can I do?

EDIT: By the way, the commands python3.9 and python3.9.0 gave the same error message:

>>> python3.9
  File "<stdin>", line 1
    python3.9
            ^
SyntaxError: invalid syntax
>>> python3.9.0
  File "<stdin>", line 1
    python3.9.0
            ^
SyntaxError: invalid syntax

Answer 1

looks like your python is linked to python2.7 instead of python3.

just type python3 on commandline, this should solve your problem. you can check the version by typing python3 --version on commandline.

the same should work for pip3

Answer 2

Errors and lines beginning with >>> suggest you're still inside Python2 interpreter. You need to exit it before trying to run Python3. You can do that by pressing the Ctrl and d buttons on your keyboard at the same time, or typing exit() .

After exiting, you should be able to run python3 .

Answer 3

The best easy way is to use anadonda based python or intel based. Anaconda based python for MacOS

This should work for you.