Gen-AI Developer Classroom notes 21/Sep/2025

lists contd..

• Matrices using list
• in python we have a library (not part of standard installation of python) called as Numpy which is widely used for matrix operations.

dictionary

• Refer Here for samples
• dictionary is mutable
• syntax for empty dictionary

x = dict()
x = {}

• with values

marks = {
    'maths': 100,
    'science': 89,
    'english': 60
}

• Refer Here

string

• Refer Here for strings

Problem – 1

• Lets write a program which maintains the total amount spend on different categories
  • food
  • entertainment
  • utilities
  • shopping
• Ask two questions amount and category continously
  • if the category doesnot exist add it
  • if the category exists add current expenditure to the alredy present
• Create a dicitonary
  • key = category
  • value = total amount spent

Problem – 2

• User enters a sentence
• you are supposed to calculate word frequency

The car ran over speedbreaker and car got broke down

word frequency
the     1
car     2
ran     1
over    1
speedbreaker 1
and     1
got     1
broke   1
down    1

• Example

The quick brown fox jumps over the lazy dog and the dog barked back at the fox
Here’s the word frequency (case-insensitive):
the → 4
fox → 2
dog → 2
quick → 1
brown → 1
jumps → 1
over → 1
lazy → 1
and → 1
barked → 1
back → 1
at → 1