Default parameter values are evaluated from still left to ideal in the event the functionality definition is executed. Because of this the expression is evaluated as soon as, in the event the perform is outlined, and that the identical “pre-computed” benefit is useful for Every call. This is particularly important to be aware of any time a default parameter is usually a mutable item, for instance a list or simply a dictionary: When the perform modifies the thing (e.
everyone tinkering with Python lengthy more than enough has been bitten (or torn to items) by the following issue:
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This code suffers from the exact same unexpected happenstance. bananas is actually a class attribute, and therefore, after you increase items to it, It can be additional to all cases of that class. The rationale is exactly the same.
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I'm nevertheless a tad befuddled this was the "Sophisticated Python" class. (I feel the complete/appropriate title was "Introduction to Sophisticated Python"?
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