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I am using Ubuntu. I want to make python3 be the default python version instead of python2. I tried many ways.

For example :

Open your .bashrc file nano ~/.bashrc. Type

alias python='python3'
alias pip='pip3'

on to a new line at the top of the file then save the file with ctrl+o and close the file with ctrl+x. Then, back at your command line type source ~/.bashrc. Now your alias should be permanent.

I also tried :

update-alternatives --remove python /usr/bin/python2
update-alternatives --install /usr/bin/python python /usr/bin/python3

But the problem didn't solve. How can I solve this issue ?

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    Please say which operating system you are using (which distribution) – Philip Couling Feb 6 at 8:50
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    Also, what exactly is the problem, and how does it manifest itself? – berndbausch Feb 6 at 8:52
  • see my answer here, that might help you. /usr/bin/python is usually just a symlink as well. – maddingl Feb 6 at 10:35
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    Be careful, I forced an upgrade once and nearly broke the installation because Ubuntu relies on a particular version. I managed to recover, but it was a pita. There is a python version manager which allow you to select which python environment to use for development, this avoids fiddling with the default installation. – X Tian Feb 6 at 10:35
  • github.com/pyenv/pyenv – X Tian Feb 6 at 10:38
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Use a python version manager, don't fiddle with the OS dependent version.

Read the readme file at this repository for further information.

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