Introduction

• We can us list, tuple and set to represent a group of individual objects as a single entity.
• If we want to represent a group of objects as key-value pairs then we should go for dictionary.

Example

student = {
  'rollno': 'name'
}
client = {
  'phone number': 'address'
}
site = {
  'ipaddress': 'domain name'
}

Properties

• Duplicate keys are not allowed but values can be duplicated.
• Heterogeneous objects are allowed for both key and values.
• Insertion order is not preserved.
• Dictionaries are mutable.
• Dictionaries are dynamic.
• Indexing and slicing concepts are not applicable.

Creation of dictionary object

There are two methods to create dictionary

d={} or d=dict()

• We create emty dictionary using {} or dict().

Example

d={}
d[1]="ajay"
d[2]="amit"
print(d)

d=dict()
d[1]="ajay"
d[2]="amit"
print(d)

Output

{1:'ajay', 2:'amit'}
{1:'ajay', 2:'amit'}

d={key:value}

• If we know data in advance then we can create dictionary using {key:value}.

Example

d={1:'ajay', 2:'amit'}
print(d)

Output

{1:'ajay', 2:'amit'}

Ungraded Questions

Get ready for an exhilarating evaluation of your understanding! Brace yourself as we dive into the upcoming assessment. Your active participation is key, so make sure to attend and demonstrate your knowledge. Let’s embark on this exciting learning journey together!