Python Dictionary – Python Programming

What is Python Dictionary and how to use it.

Python dictionary is a kind of hash-table type where it has key value. A Dictionary contains items separated by commas and enclosed within square curly braces ({  }). It is a collection of data which is changeable, indexed, and unordered. Python Dictionary does not have duplicate members.

Declaring Dictionary in Python

We can declared dictionary in two different ways:

# First Way
dict1 = {}
dict1['one']="one"
dict1[1]=1

# Second Way
dict2 = {'two':'two',2:2}

Note – The plus (+) sign is the concatenation operator and the asterisk (*) is the repetition operator. For example −

dict1 = {}
dict1['one']="one"
dict1[1]=1

dict2 = {'two':'two',2:2}

print(dict1)
print(dict2)
print(dict1["one"])
print(dict1[1])
print(dict2.keys())
print(dict2.values())

It will give output like this

>>> print(dict1)
 {1: 1, 'one': 'one'}
>>> print(dict2)
 {2: 2, 'two': 'two'}
>>> print(dict1["one"])
 one
>>> print(dict1[1])
 1
>>> print(dict2.keys())
 [2, 'two']
>>> print(dict2.values())
 [2, 'two'] 
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