How to Repeat a String in Python?

Declare variable without value - Python

Last Updated : 12 Dec, 2024

A variable is a container that stores a special data type. Unlike C/C++ or Java, a Python variable is assigned a value as soon as it is created, which means there is no need to declare the variable first and then later assign a value to it. This article will explore How to Declare a variable without value.

Using None

A common way to declare a variable without a value in Python is to initialize it with None. The None object in Python represents the absence of a value or a null value.

Python

a = None

print(a)
print(type(a))

Output

None
<class 'NoneType'>

Explanation:

Variable 'a' is declared with the 'None' keyword which is equallent to 'null'. It means that the variable is not assigned any value.
The type() function defines the type of the object created.

Declaring Empty String

A string is a set of characters enclosed within either single or double quotes. The following example demonstrait how to declare a string without assigning a value to it.

Python

s = ""

print(s)
print(type(s))

Output

<class 'str'>

Declaring Empty Data Structures

Apart from strings, we can also declare data structures like lists, dictionary, and tuple without a value in Python.

Python

# empty list
a = []
print(a)
print(type(a))

# empty dictionary
b = {}
print(b)
print(type(b))

# empty tuple
c = ()
print(c)
print(type(c))

Output

[]
<class 'list'>
{}
<class 'dict'>
()
<class 'tuple'>

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