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Python Programming – Compound statement Functions Argument
Argument
The argument is the value passed to a function (or method) while calling the function. There are two types of arguments:
Keyword argument
Keyword argument is an argument preceded by an identifier (e.g. name=) in a function call or passed as a value in a dictionary preceded by **. For example, 10, 20, 30, and 40 are keyword arguments in the following calls to summation ( ) function:
>>> def summation( aa , bb , cc , dd ) :
. . . print ' aa : ' , aa
. . . print ' bb : ' , bb
. . . print ' cc : ' , cc
. . . print ' dd : ' , dd
. . . total=aa+bb+cc+dd
. . . return total
. . .
>>> sumupl=summation( bb=20 , dd=40 , aa=10 , cc=30 )
aa : 10
bb : 20
cc : 30
dd : 40
>>> print ' Sum is: ' , sumupl
Sum is : 100
>>> sumup2=summation(** { ' bb ' : 20 , ' dd ' : 40 , ' aa ' : 10 , ' cc ' : 30 } )
aa : 10
bb : 20
cc : 30
dd : 4 0
>>> print 'Sum is:',sumup2
Sum is: 100
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Positional argument
Positional argument is an argument that is not a keyword argument. Positional arguments can appear at the beginning of an argument list and can also be passed as elements of an iterable preceded by *. For example, 10, 20, 30 and 40 are positional arguments in the following calls to summation ( ) function:
>>> def summation ( aa , bb , cc , dd ): . . . print ' aa : ' , aa . . . print ' bb : ' , bb . . . print ' cc : ' , cc . . . print ' dd : ', dd . . . total=aa+bb+cc+dd . . . return total >>> sumup3=summation( 10 , 20 , 30 , 40 ) aa : 10 bb : 20 cc : 30 dd : 40 >>> print 'Sum is:',sumup3 Sum is : 100 >>> sumup4=summation( * ( 10 , 20 , 30 , 40 ) ) aa : 10 bb : 20 cc : 30 dd : 40 >>> print ' Sum is : ',sumup4 Sum is : 100