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How to Print a Tab in Python

Starred Expression in Python

Last Updated : 01 Feb, 2025

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Starred expression (*) in Python is used to unpack elements from iterables. It allows for extracting multiple values from a sequence and packing them into a list or a tuple or even collecting extra arguments in a function. It can also be used in assignments to separate elements or merge iterables.

Unpacking with * in function arguments

We can use * to capture multiple positional arguments in a function.

Python

def print_n(a, b, *args):     print(a)  # First argument     print(b)  # Second argument     print(args)  # All additional arguments collected in a tuple  print_n(1, 2, 3, 4, 5)

Output

1 2 (3, 4, 5)

Explanation: Function print_n() accepts two required arguments (a and b) and any additional arguments are captured as a tuple args using *args syntax

Below are multiple ways we can use (*) starred expression

Table of Content

Unpacking in function calls
Unpacking with * for variable assignment
Using * for merging lists
Using * with a generator expression

Unpacking in function calls

We can use * to unpack a list/tuple into positional arguments, and ** to unpack a dictionary into keyword arguments when calling a function.

Python

def info(name, age, city):     print(f"Name: {name}, Age: {age}, City: {city}")  a = ['Geeks', 30, 'New York'] info(*a)  # Unpacks the list into function arguments

Output

Name: Geeks, Age: 30, City: New York

Explanation:

Function info() accepts three arguments (name, age and city) and prints them in a formatted string.
List info is unpacked using *info which passes each element of list as separate arguments to the function resulting in Name: Geeks, Age: 30, City: New York

Unpacking with * for variable assignment

Starred expression can be used to unpack an iterable capturing multiple values into a list.

Python

a, *b, c = [1, 2, 3, 4, 5] print(a) print(b) print(c)

Output

1 [2, 3, 4] 5

Explanation: Assignment a, *b, c = [1, 2, 3, 4, 5] unpacks list so that a gets first element (1) c gets the last element (5) and b captures middle elements ([2, 3, 4]) as a list.

Using * for merging lists

We can use * in a list or tuple to merge sequences.

Python

a = [1, 2, 3] b = [4, 5, 6] # Use the unpacking operator * to merge the two lists into one c = [*a, *b] print(c)

Output

[1, 2, 3, 4, 5, 6]

Explanation:

Unpacking operator * is used to unpack elements of lists a and b merging them into a new list c.
Result is combined list [1, 2, 3, 4, 5, 6] containing all elements from both a and b.

Using * with a generator expression

We can use * with a generator expression to collect results into a list.

Python

n = [1, 2, 3, 4, 5]   # Use map() with a lambda function to square each element. s = [*map(lambda x: x**2, n)]   print(s)

Output

[1, 4, 9, 16, 25]

Explanation:

map() function applies the lambda x: x**2 to each element in list n squaring each element.
Unpacking operator * is used to convert result into a list s.

How to Print a Tab in Python

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