Python3 命令在我的虚拟环境中不起作用

Question

I have Python-3.8.1 installed in my virtual environment, but still the default version is Python-2.7 only (because of MacOS)

Now, whenever I try to run a command starting with python3 , such as python3 manage.py startapp... or python3 manage.py runserver , I get this error:

SyntaxError: Generator expression must be parenthesized

Answer 1

Are you using an older version of Django? Based on this Django 1.11 and Python 3.7+ are incompatible.

To upgrade your django package, first switch to your virtual environment:

conda activate your-django-env-name

Then run the following command to get the latest version on your virtual environment:

pip install django --upgrade

Answer 2

1. To create an environment with a specific version of Python:

conda create -n myenv python=3.6

2. To create an environment with a specific package:

conda create -n myenv django=1.11.29

For your use case I suggest:

conda create -n myDjangoEnv python=3.6 django=1.11.29

First activate the conda environment before running any commmand:

conda activate myDjangoEnv

You won't be required to type 'python3', simply use 'python'.