In Python, default argument values are evaluated only once when a function is defined, not each time the function is called. This means that using mutable default arguments, like lists, can lead to unexpected behavior where changes to the list in one instance affect others that share the same default. For example, a function using a mutable list to track tasks could inadvertently share that list across multiple instances, leading to confusion and bugs. Developers need to be aware of this gotcha to avoid problems.
Using mutable objects as default argument values in Python can lead to unintended side effects, such as shared state across multiple function calls.
Default argument values are evaluated only once at the time of function definition, creating potential issues when mutable objects are used.
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