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Tuple Statements

The Assignment Sratement. There is a variation on the assignment statement called a multiple-assignment statement that works nicely with tuples. We looked at this in the section called “Multiple Assignment Statement”. Multiple variables are set by decomposing the items in the tuple.








An essential ingredient here is that a tuple has a fixed and known number of elements. For example a 2-dimensional geometric point might have a tuple with x and y . A 3-dimensional point might be a tuple with x , y , and z .

This works well because the right side of the assignment statement is fully evaluated before the assignments are performed. This allows things like swapping two variables with x,y=y,x.

The for Statement. The for statement also works directly with sequences like tuples. The range function that we have used creates a list (a kind of sequence covered in the next section). A tuple is also a sequence and can be used in a for statement.

s= 0
for i in ( 1,3,5,7,9, 12,14,16,18, 19,21,23,25,27, 30,32,34,36 ):
    s += i
print "total",s

  Published under the terms of the Open Publication License Design by Interspire