Data

Literal

Python

 

Literal Types

Python 2.7
booleanVar = True
integerVar = 12
floatingPointVar = 1.618
complexVar = 2j+1
stringVar = "Hello"
listVar = [1, 2, 3]
tupleVar = (1, 2, 3)
dictVar = { "name": "Sam", "age": 21}
setVar = {"apple", "banana", "orange"}
noneVar = None

Literals represent values, like: True, 12 or "Hello".

Literals in Python can be grouped into these categories:

  • Boolean
  • Integer
  • Floating-point
  • Complex number
  • String
  • List
  • Tuple
  • Dictionary
  • Set
  • None
 

Boolean Literal

Python 2.7
enable   = True
disable  = False

There are 2 Boolean literals, True and False.

 

Integer Literal

Python 2.7
ans1 = 42         # Base10
ans2 = 0b101010   # Binary
ans3 = 0o52       # Octal
ans4 = 0x2A       # Hexadecimal

There are 4 Integer Literal representations:

  • Base10
  • Binary (base 2)
  • Octal (base 8)
  • Hexadecimal (base 16)

All the variables defined here are equal to value 42.

 

Floating-Point Literal

Python 2.7
pi1 = 3.14159     # Normal
pi2 = 314159E-5   # Scientific

There are 2 Floating-point Literal representations:

  • Normal
  • Scientific

Both variables defined here are equal.

 

Complex Literal

Python 2.7
complexVar = 2j+1

Python natively supports Complex Numbers.

Complex numbers are an extension of the familiar real number system in which all numbers are expressed as a sum of a real part and an imaginary part.

 

String Literal

Python 2.7
name1 = 'sam'
name2 = "sam"
name3 = '''sam'''

String is a sequence of characters.

There are 3 String Literal representations:

  • Single quote
  • Double quote
  • Triple quote

The differences between these Literals will be explained in the String topic.

 

List Literal

Python 2.7
groceries = ["Milk", "Egg", "Corn"]

List is an ordered sequence of items.

Lists in Python are similar to Arrays in other Languages.

Here, We are creating a list of 3 elements named groceries.

Lists will be discussed in the Array topic.

 

Tuple Literal

Python 2.7
groceries = ("Milk", "Egg", "Corn")

Tuple is an immutable List.

Here, We are creating a Tuple of 3 elements named groceries.

Tuples will be discussed in the Array topic.

 

Dictionary Literal

Python 2.7
sam = {"name": "Sam", "age": 21}

Dictionary is a collection of key/value pairs, in which keys are unique.

Here, We are creating a dictionary with two keys name and age.

Dictionary will be discussed in the Map topic.

 

Set Literal

Python 2.7
groceries = {"Milk", "Egg", "Corn"}

Set is a collection of unique items.

Here, we are creating a set with 3 items.

Set will be discussed in the Map topic

 

None Literal

Python 2.7
nextElement = None

None is used to represent the absence of a value.

It is similar to null in other programming languages.