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things like this: two months ago,I try to install python2.7 and python3.3 on my Ubuntu computer to learn python.All things look good before I remove one version.When I use another software,I find some code under my terminal like this:

-bash: /usr/lib/command-not-found: /usr/bin/python3:

I don't know what this means.Help me and tell me the reason!

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