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Discussion on: 5 common mistakes made by beginner Python programmers

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Riccardo Bernardini

Default arguments are evaluated only once.

Ouch! This was quite surprising. It reminds me of old FORTRAN days when you could change the value of a constant. (FORTRAN passes everything by address, this means that if you want to pass a constant to a function, you need to write the constant somewhere and pass the address. If the function changes the parameter, the constant will change.)