Python novices would hope this purpose called without having parameter to constantly return a list with only one ingredient: [5]. The result is alternatively extremely distinct, and very astonishing (for just a newbie):
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eleven I have not doubt mutable arguments violate least astonishment theory for an average person, and I have observed inexperienced persons stepping there, then heroically replacing mailing lists with mailing tuples. Yet mutable arguments are still in step with Python Zen (Pep 20) and falls into "evident for Dutch" (comprehended/exploited by really hard core python programmers) clause.
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3 Senior coders can't magically capture all bugs. Code critique is great and important, but Never pretend they're able to reduce "newbie bugs" from which makes it to generation. Even authorities introduce these types of bugs themselves Every now and then.
Lutz PrecheltLutz Prechelt 38.6k1111 gold badges6666 silver badges8989 bronze badges six 25 It took me a year to seek out this habits is messing up my code on output, ended up eliminating a complete feature until eventually I bumped into this style flaw by accident.
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326 whether it is a style flaw, your respond to seems to suggest this behaviour is in some way necessary, normal and clear provided that functions are first-class objects, and that only isn't the scenario. read more Python has closures. when you replace the default argument with the assignment on the primary line of your perform, it evaluates the expression Each and every call (potentially working with names declared in an enclosing scope).
Lennart RegebroLennart Regebro 171k4444 gold badges228228 silver badges252252 bronze badges five How would you define a class attribute that is different for every instance of the class?
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