[Tutor] strange errors

[Gabriele Brambilla]

Hi,

sometimes when I try to run a program in Python I obtain some errors.
The strange thing is that sometimes when I run it a second time or when I
turn off the pc and I restart later to try to make it works it gives
different errors.

How could I avoid this problem? I think that it is because it "remember"
some variables that I have used...

Thanks

Gabriele
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