Python Dictionary

1. P Y T H O N D I C T I O N A RY

2. I N T R O D U C T I O N
Sample
Footer
Text
Dictionary in Python is an unordered
collection of data values, used to store data
values like a map, which, unlike other Data
Types that hold only a single value as an
element, Dictionary holds key: value pair.
Key-value is provided in the dictionary to
make it more optimized.
2

3. C R E A T I N G A
D I C T I O N A R Y
 Creating a dictionary is as simple as
placing simple items inside curly
braces{} separated by comma.
 Each element in a dictionary is
represented by a KEY:VALUE pair.
 While values can be of any data type
and can repeat keys must be of
immutable type and must be unique.

4. E L E M E N T S I N D I C T I O N A R Y
Accessing Changing Removing
M O N D A Y , F E B R U A R Y 1 , 2 0 X X 4

5. A C C E S S I N G E L E M E N T S F R O M
D I C T I O N A RY
5
 While indexing is used other data types to access
values, a dictionary uses keys.
 Keys can be used either inside square brackets [] or
with the get() methods.
 If we use the square brackets [] , key error is raised
in case a key is not found in the dictionary.

6. C H A N G I N G A N D A D D I N G
D I C T I O N A R Y E L E M E N T S
6
Dictionaries are mutable. We
can add new items or change
the value of existing items
using an assignment operator.
If the key is already present,
then the existing value gets
updated. In case the key is not
present, a new (key: value)
pair is added to the dictionary

7. R E M O V I N G
E L E M E N T S
F R O M
D I C T I O N A R
Y
7

9. N E S T E D
D I C T I O N A RY
Nesting Dictionary means
putting a dictionary inside
another dictionary. Nesting is of
great use as the kind of
information we can model in
programs is expanded greatly.
9

10. Sample
Footer
Text
10