Python Classroom notes 23/Apr/2025

Naming conventions

• Pascal Casing: In this case every word starts with capital case

Value
MyValue
MyNewValue

• Camel Casing

value = "hello"
myValue = "hello"
myNewValue = "hello"

• Snake Casing

value = "hello"
my_value = "hello"
my_new_value = "hello"

• Capital Snake Casing

VALUE = "hello"
MY_VALUE = "hello"
MY_NEW_VALUE = "hello"

• In python for
  • variables we use snake casing
  • function names we use snake casing
  • class names we use Pascal Casing
  • constant values we use Capital Snake casing

Spacing in python

• Consider the following

10**3

• It recommeneded to use

10 ** 3

Indentation in python

• Python follows strict indentation

Operators and Numeric Data types

• Refer Here for operators

Doc Strings

• Refer Here for doc strings

First Program

• Average of marks
• Topics
  • doc string
  • input
  • typecasting
• Refer Here

"""This program is to learn numeric types and its 
operators

Topics:
  input
  typecast
"""

maths = float(input("Enter maths marks: "))
science = float(input("Enter science marks: "))
social = float(input("Enter social marks: "))
average = (maths + science + social) / 3
print(average)

• Write a program to calculate compound intrest

Conditional expressions

• comparision operators
• logical operators

Conditionals

• if statement

if <conditional-expression>:
   ....
   ....

• if else

if <conditional-expression>:
   ....
   ....
else:
   ....
   ....

• if elif else

if <conditional-expression>:
   ....
   ....
elif <conditional-expression>:
   ....
   ....
elif <conditional-expression>:
   ....
   ....
else:
   ....
   ....

• Program to print different id cards according to age in india

Minimum Age	Identity Cards
Birth	Birth Certificate, Aadhaar Card (can be obtained for newborns)
Any Age	Passport, PAN Card, Bank/Post Office Passbook
Enrolled	School/College ID Card (for currently enrolled students)
No specific age	Ration Card
18 years	Voter ID Card (EPIC), Driving License
60 years	Senior Citizen Card (eligibility criteria might vary slightly by state)

age = int(input("Enter your age: "))
print("You are eligbile for ")
print("Birth Certificate \nAadhaar Card \nPassport \nPAN Card \nBank/Post Office Passbook")
if age >= 18:
    print("Voter ID Card (EPIC) \nDriving License")
if age >= 60:
    print("Senior Citizen Card")

looping

• In python we have two approaches
  • while
  • for

while

• while
• Syntax

while <conditional-expression>:
   ...
   ...
   ...

• To exit out of while loop we have two options
  • conditonal expression becoming false
  • break keyword