Python

dictionary datatype:

• Unsorted mapping for storing objects.
• dictionary uses key-value pairing.
• We can quickly grab value object with the help by key.
• dictionary use curly braces and colon to specify the keys and their assiciated values.

Example, -

Input =>
my_dict = {"banana":10.00, "apple":30.00, "orange":25.50}
print(my_dict)
Output =>
{"banana":10.00, "apple":30.00, "orange":25.50}

dictionary operations

Example - 1:

Input =>
my_dict = {"banana":10.00, "apple":30.00, "orange":25.50}
my_dict['apple']
Output =>
30.00

Example - 2:

Input =>
my_dict = {"key1":"a", "key2":"b", "key3":"c"}
my_dict['key2'].upper()
Output =>
B

Example - 3:

Input =>
my_dict = {"k1":"a", "k2":[1, 2, 3], "k3":"c"}
my_dict['k2'][2]
Output =>
3

Example - 4:

Input =>
my_dict = {"username":"jsmith", "detail":{"firstName":"John", "lastName":"Smith", "age":20}}
my_dict['detail']['age']
print(my_dict['detail']['firstName'] + ' ' + my_dict['detail']['lastName'] + ' age is ' + my_dict['detail']['age'])
Output =>
20
John Smith age is 20

Example - 5: Adding element into dictionary

Input =>
my_dict = {"username":"jsmith", "detail":{"firstName":"John", "lastName":"Smith", "age":20}}
my_dict['address'] = 'India'
my_dict['detail']['age'] = 25
my_dict
print(my_dict['detail']['firstName'] + ' ' + my_dict['detail']['lastName'] + ' age is ' + my_dict['detail']['age'])
Output =>
{"username":"jsmith", "detail":{"firstName":"John", "lastName":"Smith", "age":20}, "address": "India"}
John Smith age is 25

Other useful methods:

Input =>
my_dict = {"banana":10.00, "apple":30.00, "orange":25.50}

Method	Usage	Output	Additional Information
keys	my_dict.keys()	[‘banana’, ‘apple’, ‘orange’]	Method returns all keys from dictionary
values	my_dict.values()	[10.00, 30.00, 25.50]	Method returns all values from dictionary
items	my_dict.items()	(“banana”:10.00, “apple”:30.00, “orange”:25.50)	Method returns tuple from dictionary. Tuple is immutuable. not able to re-assigned

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