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Python not showing up in Command Prompt after first input

I'm currently trying to install a package on python that can only be installed on Python 3. I have both 3.6 and 2.7. I'm on a Windows machine. Whenever I type "python" into a newly opened command prompt it returns python 2.7. Then whenever I type "python" it says

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'python' is not defined


I believe python 3.6 is set as an environment variable on my path. Can someone offer some advice on how to switch these over? I've read py.exe from python 3's installion should switch between python 2 and 3, but I do not see how I am supposed to run that command other than clicking on it in my File Explorer and that does nothing.

2 Answers
2

You type python in python repl

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'python' is not defined


You should open a new command prompt or type ctrl+Z or quit() in the python repl

For switching python 2 and 3

Use

py -3
py -2


Once you type in python, you go into Python's interpreter mode, where you can type Python code and get the result. You can type quit to leave that mode. If you want to run a script, you need to run, instead of just python, python filename.py, with the appropriate filename.

python

quit

python

python filename.py

But you want to do that outside of the interpreter mode (otherwise known as REPL).

Note that the above will probably cause Python 2.X to be used to run your script, so if you want to run Python 3.X you will want to include this at the top of your script

#!/usr/bin/env python3


and then just run it from a newly opened command prompt (or any command prompt that is not in Python's interpreter mode) like filename.py.

filename.py

See this question for more information.

pip install tensorflow File "<stdin>", line 1 pip install tensorflow

pip

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