Vineeth Mohan wrote:
Hi,
How are variables in python passed. By value or by referrence?
Neither.
What makes you think that value and reference are the only two choices?
See this Wikipedia article for a list of at least a dozen different
argument passing techniques:
http://en.wikipedia.org/wiki/Evaluation_strategy
Three months ago I answered a similar question. You could do worse than
read this:
http://www.mail-archive.com/tutor%40python.org/msg46612.html
Is the following the only way to pass by reference? or is there any
other way
To mimic the behaviour of pass-by-reference, it is more common to pass a
single-element list:
>>> def modify(arg):
... arg[0] = 23
...
>>> var = [42]
>>> modify(var)
>>> assert var[0] == 23
>>>
but using instance attributes also works.
--
Steven
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