Cambiar python version desde la consola

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Open your .bashrc file nano ~/.bashrc. Type alias python=python3 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.
EDIT:
For update alternatives, the priority is an integer. The priority represents which program should be the first used. This article sums it all up pretty well.

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