The document explains the concept of variables in Python, describing them as containers for storing data values and outlining key naming rules, such as starting with a letter or underscore, avoiding spaces and special characters, and being case-sensitive. It provides examples of valid and invalid variable names and explains how to assign values using the assignment operator '='. Additionally, the document highlights the importance of using meaningful names for variables to enhance code readability and reusability.

4. WHAT IS A VARIABLE IN PYTHON?
• Variables are containers for storing data values given by the
users.
• A variable is a memory location to store values or data.

5. Example:

6. 1. Variable starts with a letter or underscore:
Eg: school, age, or _average
2. Veriable cannot start with a number.
Eg. 123Name7
3. Variable will not have space in the middle. Eg. School Name
4. Do not use any special character like @,# %!
5. Use descriptive names: Use names that describe what the variable represents.
6. Variable is Case-sensitive. Eg. (age, Age, and AGE are three different variables)
7. Avoid using reserved keywords:
- Don't use reserved keywords as names.
- Example: Avoid using words like for, if, Else, while, def, print, etc
The guidelines or rules to follow when naming variables.

7. 1. Variable starts with a letter or underscore:
Eg: school, age, or _average
2. Veriable cannot start with a number.
The guidelines or rules to follow when naming variables.
message_1 ✅
1_message ❌
21 aVenue❌
Avenue21✅

8. 3.Variable will not have space in the middle.
Eg.
4.Do not use any special characters like
Eg @,# %!
5. Variables should be short and meaningful/descripti
Date of birth ❌
Date_of_birth ✅
- Students_name is better than S_N
- Name= Puja N=Puja

9. 6. Variable is Case-sensitive.
Eg. (age, Age, and AGE are three different
variables)
7. Avoid using reserved keywords:
Eg: Avoid using words like:
for, if, else, while, def, print, or
, not, and int, float, string etc

10. HERE ARE SOME EXAMPLES OF VALID VARIABLE NAMES:
• myVariable
• _privateVar
• counter123
• school_name

11. HERE ARE SOME EXAMPLES OF INVALID VARIABLE NAMES:
• 123variable (starts with a number)
• @special (contains a special character)
• for (uses a reserved keyword)
• Stu Name (Space in the mddle)

12. • When the variable name is taken, you need to put something in the
variable. The format is as follows:
•= means not the equal sign in mathematics, but the assigned symbol,
which means to save the value on the right to the variable on the left.
ASSIGNING VALUES TO VARIABLES
number = 9

13. Output Variables
The Python print statement is often used to output variables.
To combine both text and a variable, Python uses the + character:
x = "awesome"
print("Python is " + x)
You can also use the + character to add a variable to another variable:
x = "Python is "
y = "awesome"
z = x + y
print(z)
x=("Python is")
y=("awesome")
print(x,y)

14. WHY WE USE VARIABLES IN PYTHON CODING?
Storage: Variables store data like numbers or text during program
run.
Reuse: You can use data stored in variables again and again.
 Manipulation: It helps to change the data easily.
Readability: Variables give data meaningful names for clear code.

15. Any Questions….

16. QUICK ASSESSMENT
ON
LESSON PRESENT
First Hand First
Q-1 Q-2 Q-3

17. Which is incorrect Variables as per guidelines?
A. counter123
B. _privateVar
D. Stu name
C. school_name

18. Which is the correct way to declare a variable in Python?
B. NAME =Puja12
A. 12name = Puja
D. -name=puja
C. #Puja=name
a) variable_name = value
b) b) value = variable_name c) value = 123 d) value123 =
123

19. 19
21
20
22
Open Question

20. Thank you
&
Tashi Delek

21. YES!
Correct Answer !
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