33 - Dictionaries

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2023-12-31 - 00:02

Dictionaries are an ordered collection of data items. They store multiple items in a single variable. Dictionary items are key-value pairs that are separated by commas and enclosed within curly brackets {}.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
print(info)

Output:

{'name': 'Karan', 'age': 19, 'eligible': True}

Accessing Dictionary items:

I. Accessing single values:

Values in a dictionary can be accessed using keys. We can access dictionary values by mentioning keys either in square brackets or by using get method.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
print(info['name'])
print(info.get('eligible'))

Output:

Karan
True

II. Accessing multiple values:

We can print all the values in the dictionary using values() method.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
print(info.values())

Output:

dict_values(['Karan', 19, True])

III. Accessing keys:

We can print all the keys in the dictionary using keys() method.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
print(info.keys())

Output:

dict_keys(['name', 'age', 'eligible'])

IV. Accessing key-value pairs:

We can print all the key-value pairs in the dictionary using items() method.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
print(info.items())

Output:

dict_items([('name', 'Karan'), ('age', 19), ('eligible', True)])

Main Example

info = {'name':'Karan', 'age':19, 'eligible':True}
# print(info) 
# print(info.keys())
# print(info.values())

# for key in info.keys():
#   print(f"The value corresponding to the key {key} is {info[key]}")

print(info.items())
for key, value in info.items():
  print(f"The value corresponding to the key {key} is {value}")