On 3/10/2013 3:06 AM, bessenkphilip wrote:
Hello Bob,
Hi. When you have a Python question that is not related to Python
Pipelines I suggest you send it to the tutor group.I and others will see
it and you will get faster help.
While trying one Fibonacci example in tutorial, i'm having some
doubts. The program is as below
>>> a, b = 0, 1
>>> while b < 10:
... print b
... a, b = b, a+b
Here i tried the last line as separate lines as:
a = b
b = a + b
but it returned an error in the first line itself( a = b)
Always post the traceback. I can't help you here without that. Also show
the program, or sequence of statements entered at >>>.
From the c programs, i think we use a variable "c" for assigning such
that "a = b" and "b =c" where 'c' is the sum of (a+b).
In the python example, the line .. a, b = b, a+b
i interpreted this as "a = b" and "b = a + b" but as the c programs,
won't 'a' already got b's value first.? if that then the line " b =a
+b" will be like 'b= b + b" (as a already got b's value)
Python evaluates what's on the right side of the = first. b, a+b is an
expression list. The result (the first time) is a tuple (1, 0+1) which
is (1, 1).
Then it evaluates the assignment (=). SInce the target is 2 variables it
"unpacks" the tuple. The result is
a = 1
b = 1
--
Bob Gailer
919-636-4239
Chapel Hill NC
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