Common Questions - sopython

This is a list of common questions within the Python tag. Each question includes some canonical SO questions that can be used to close-vote any new questions that match. If you have any suggestions then please come see us in chat.

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Appending in a loop creates a list of unexpected duplicates mutable dictionary reference list A mutable object is modified in a loop and appended to a list. The OP is surprised that all of the list items are duplicates of the last appended object.
*Duplicating a list through multiplication (``), shares references for the contents** mutable multiplication list Multiplying a list creates a shallow copy, not a deep copy, so any mutable objects in the list are then shared. Solution is to use a list comprehension to create separate objects.

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