问题
I got both python2 and python3 installed in my debian machine. But when i try to invoke the python interpreter by just typing 'python' in bash, python2 pops up and not python3. Since I am working with the latter at the moment, It would be easier to invoke python3 by just typing python. Please guide me through this.
回答1:
the only somehow safe way would be to use an alias in your shell, by placing
alias python=python3
into your ~/.profile or ~/.bashrc...
this way the system scripts depending on python being python2 won't be affected.
回答2:
Well, you can simply create a virtualenv with the python3.x using this command:
virtualenv -p <path-to-python3.x> <virtualenvname>
回答3:
btw, if you are using bash or running from the shell, and you normally include at the top of the file the following line:
#!/usr/bin/python
then you can change the line to instead be:
#!/usr/bin/python3
That is another way to have pythonX run instead of the default (where X is 2 or 3).
回答4:
Others have adviced you about the possible drawbacks, so, on the issue at hand:
ln -s $(which python3) /usr/local/bin/python
回答5:
using command:
update-alternatives --config python
Might Work However On My System(I have Python2&3 Installed As Well) It Gives Me An Error Saying No Alternatives For Python...
来源：https://stackoverflow.com/questions/10434260/how-to-make-python3-2-interpreter-the-default-interpreter-in-debian