[docs] [issue26458] Is the default value assignment of a function parameter evaluated multiple times if it is Parameter=None
report at bugs.python.org
Mon Feb 29 05:30:45 EST 2016
Ezio Melotti added the comment:
This is not a bug, see https://docs.python.org/3.6/faq/programming.html#why-are-default-values-shared-between-objects
In the first case L is evaluated once at compile time.
In the second case L is always set to a new empty list, regardless of what you pass as second argument to f.
In the third case L is set to a new empty list only if you don't pass a second argument (or if you pass None).
resolution: -> not a bug
stage: -> resolved
status: open -> closed
type: -> behavior
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