Can tuples be replaced with lists all the time?
ben+python at benfinney.id.au
Sun Feb 23 05:49:19 CET 2014
Sam <lightaiyee at gmail.com> writes:
> My understanding of Python tuples is that they are like immutable
That's a common expression, but I think it's not a helpful way to think
Rather, the different sequence types have different semantic purposes:
* For representing a sequence where each item means exactly the same no
matter which position it's in (a “homogeneous sequence”), use a list.
* For representing a sequence where the meaning of each item is strongly
dependent on its position in the sequence (a “heterogeneous
sequence”), use a tuple.
See <URL:http://docs.python.org/3/library/stdtypes.html> for the
official Python description of the type differences.
> If this is the cause, why can't we replace tuples with lists all the
> time (just don't reassign the lists)? Correct me if I am wrong.
Because we need to represent different semantic concepts in our code,
and have each type support the semantics with different operations.
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