Python – Data Types

In the previous chapter, we had learned about variables. In this tutorial, we will discuss data types in Python language. In Python programming, data types are inbuilt and need not declare the type of a variable. Everything in Python is an object, so data types are classes and variables are known as an object.

Numeric Types – int, float, complex

Integer or int: Integers are whole numbers and can be of any length.

Float: Numeric value specified with a decimal point is known as float.

Complex Number: Complex numbers have a real and imaginary part, appending with ‘j’ or ‘J’.

a=10
b=3.14
c=1 + 2j
print(a)
print(b)
print(c)

type() – We can use type() function in python with one argument, to check the type of variable or object.

a=10
b=3.14
c=1 + 2j
print(type(a))
print(type(b))
print(type(c))
Sample Output :
<class ‘int’>
<class ‘float’>
<class ‘complex’>

Boolean

Boolean: In Python, the boolean type may have True or False value. Capitalization of the first character is a must.

a=True
b=False

print(a)
print(b)

print(type(a))
print(type(b))
Sample Output:
True
False
<class ‘bool’>
<class ‘bool’>

String

String: In Python, text values are stored as a string. It is a sequence of characters, delimited with single or double-quotes.

a='First String'
b="Second String"

print(a)
print(b)

print(type(a))
print(type(b))

Sample Output:
First String
Second String
<class ‘str’>
<class ‘str’>

Sequence Data Type – list, tuple, range

List: lists are sequence type and may store the collection of different types of data, it is mutable.

Tuple: A tuple is similar to a list, but it is immutable.

Range: Range is also an immutable type and commonly used for looping.

#creating a list by placing all items inside a square bracket [ ].
n=[10,20,30]
print(n)
print(type(n))

#creating a tuple by placing all items inside a round bracket ( ).
n=(1,2,3)
print(n)
print(type(n))

#creating a range using function.
n=range(10)
print(n)
print(type(n))

Set Data Types – set, frozenset

Set: Set is a collection of unique and unordered objects. It is mutable and creates using a set() function.

Frozenset: Frozenset is also a collection of unique and unordered, but it is immutable. We can create it using a frozenset() function.

#creating a set, using set() function
x = set("abacda")
print(x)
print(type(x))

#creating a frozenset, using a frozenset() function
x = frozenset("abacda")
print(x)
print(type(x))
Output:
{‘b’, ‘c’, ‘d’, ‘a’}
<class ‘set’>
frozenset({‘b’, ‘c’, ‘d’, ‘a’})
<class ‘frozenset’>

Mapping Data Types – dict

dict: – A dictionary is an unordered and mutable collection of objects, and have keys and values. In Python, dictionaries are creating using curly brackets { }.

#creating a dictionary, having keys and values.
x = {"one":1,"two":2,"three":3}
print(x)
print(x.keys())
print(x.values())
print(type(x))

Output:
{‘three’: 3, ‘two’: 2, ‘one’: 1}
dict_keys([‘three’, ‘two’, ‘one’])
dict_values([3, 2, 1])
<class ‘dict’>

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Created on By S. Shekhar

Python - Quiz 5

1 / 4

Which of the following is used to create a list?

2 / 4

Which of the following is used to create dictionaries in python?

3 / 4

Which of the following is immutable?

4 / 4

Which of the following is false?

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