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Editorial Team
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Asked: 2026-06-10T08:00:24+00:00

I just started learning Flask (and as a result, getting into virtualenv as well).

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I just started learning Flask (and as a result, getting into virtualenv as well). I followed a tutorial on Flask’s documentation and created a small application. I installed Flask and yolk using venv and everything was working fine.

I restarted my computer and when I activated virtualenv again, flask and yolk were no longer recognised. I had to reinstall them via easy_install. Does venv remove any installed packages once the computer has been restarted?

What happened here? Is there anything I need to do from my side?

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  1. Editorial Team

    As long as you’re sourcing the virtualenv correctly and installing the packages correctly, your virtualenv should not be affected by a reboot. It’s completely independent of that. There are one of three possibilities that I can think of that explains your issues:

    1. The incorrect virtualenv was sourced
    2. You installed flask and yolk onto the system python
    3. You used some kind of ephemeral storage

    (The third is the least likely)

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