Richard.Jones at fulcrum.com.au
Wed Mar 15 23:44:45 CET 2000
> I haven't found anything about pointers in python. Is there a pointer
> type? If so, what is the syntax?
In Python, the things you have come to know as variables are best thought of
as "labels" for objects. In old-fashioned pointer-language-speak, they're about
as equivalent to references or pointers as you're going to get.
>>> a = 'hello world'
In this case, 'a' is a label for the string object 'hello world'. We could
assign another "pointer" to the same string by:
>>> b = a
So 'b' is now a label on the same object as 'a'. In pointer-language-speak,
it's a pointer referencing the same data. Note that Python special-cases some
very common objects (only immutable ones) so that you're using a reference to
the same object:
>>> c = 1
>>> d = 1
Neat huh? Common strings that you use in your programs may be intern()'ed
... but I'll leave that as an exercise for you to find out about (see the
Library Reference for details about intern() and id()).
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