What does the Star operator mean in Python?

PythonServer Side ProgrammingProgramming

The asterisk (star) operator is used in Python with more than one meaning attached to it.

For numeric data types, * is used as multiplication operator

>>> a=10;b=20
>>> a*b
200
>>> a=1.5; b=2.5;
>>> a*b
3.75
>>> a=2+3j; b=3+2j
>>> a*b
13j

For sequences such as string, list and tuple,  * is a repetition operator

>>> s="Hello"
>>> s*3
'HelloHelloHello'
>>> L1=[1,2,3]
>>> L1*3
[1, 2, 3, 1, 2, 3, 1, 2, 3]
>>> T1=(1,2,3)
>>> T1*3
(1, 2, 3, 1, 2, 3, 1, 2, 3)

Single asterisk as used in function declaration allows variable number of arguments passed from calling environment. Inside the function it behaves as a tuple.

>>> def function(*arg):
    print (type(arg))
    for i in arg:
      print (i)


>>> function(1,2,3)
<class 'tuple'>
1
2
3


raja
Published on 06-Feb-2018 07:12:59
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