Definition
Variable A variable is a name……
Variables, expressions, statements
Variable A variable is a name used to store or refer to a value in a program.
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24 min
213 cards
38 programs 11 MCQs v3
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Program
Example
Explanation
Here: x → Variable name 10 → Value Simple definition: Value-க்கு ஒரு பெயர் கொடுத்து அதை progr……
Explanation
then: x + y produces: 30 Simple definition: ஒரு value/result கொடுக்கும் ……
Program
Example
Explanation
This is an assignment stateme……
Explanation
This is a function-call statement used to display the……
Simple Explanation
இந்த three concepts-ஐ ஒரு real-life example-ல பார்க்கலாம். Suppose: price = 100 quantity = 3 total = price * ……
Flow
Variable Flow Value ↓ Variabl……
Program
Example
Explanation
10 ↓ Assigned to x ↓ Use x anywhere Expression Flow Values / Variables ↓ Operators applied ↓ Expr……
Program
Example
Program
Example
Explanation
or: variable operator variabl……
Definition
Variable என்பது ஒரு value-ஐ r……
Explanation
Example
name = "Python" Here: name → ……
Simple Explanation
Variable-ஐ ஒரு labelled box ப……
Program
Example
Explanation
Conceptually: age → 25 Later:…
Syntax
Examples
Important
Python-ல் variable create செய்ய தனிய……
Program
Example
Explanation
Python automatically understa……
Important
Python is Dynamically Typed…
Program
Example
Explanation
Later: x = "Python" Python al……
Explanation
x = 100 x → variable name = →……
Explanation
Variable naming
Valid Variable Names age = 25 student_name = "Kumar" mark1 = 90 _total = 100 All valid. Invalid Variable Name……
Important
Variable Naming Rules Variable name can contain letters. It can contain digits. It can contain underscore _. ……
Common Mistake
Wrong: student-name = "Arun" Python i……
Memory Trick
Variable: Name = Value…
Program
Example
Remember
Left side → Name Right side →……
Multiple Assignment
Python can assign multiple va……
Explanation
Example
x, y, z = 10, 20, 30 Equivalent to: x = 10 ……
Explanation
a, b = 10, 20…
Variable Reassignment
A variable value can be chang……
Program
Example
Why? Latest assignment replaces the ea……
Definition
Expression என்பது values, variables, operators, or function calls சேர்ந்த ஒரு com……
Simple Explanation
Expression = Calculation or v……
Explanation
Example
5 + 4…
Output
Result
அதனால் இது expression.…
Flow
Operand ↓ Operator ↓ Operand ……
Explanation
Example
10 + 20 10 → Operand…
List
- → Operator…
Explanation
20 → Operand Result → 30 oper……
Important
Operand Operator வேலை செய்யும……
Explanation
Example
10 + 20 10 → Operand 20 → Ope……
List
- → Operator…
Explanation
Expression: x * y If: x = 10 ……
Types of Expressions
Algorithm
1. Arithmetic Expression…
Used for mathematical calcula……
Explanation
Example
x + y Operators: + - * / % **……
Output
Result
Algorithm
1. Relational / Comparison Ex……
Used to compare values.…
Explanation
Example
10 > 5…
Output
Result
Quote
Operators
Quote
=…
Algorithm
1. Logical Expression…
Uses logical operators.…
Explanation
Example
10 > 5 and 20 > 10…
Output
Result
Operators: and or not…
Algorithm
1. String Expression…
Explanation
Example
"Hello" + " Python"…
Output
Result
Algorithm
1. Function Call Expression…
Program
Example
Output
Result
Important
Expression must produce a value. ……
Expression Evaluation
Python follows operator prece……
Explanation
Example
2 + 3 * 4 Python does multipl……
Output
Result
Important
Parentheses can change evalua……
Explanation
Example
(2 + 3) * 4 First: 2 + 3 = 5 ……
Common Mistake
Students may think: 2 + 3 * 4 is: 5 * 4 =……
Memory Trick
Expression: Values + Operator……
Definition
Statement என்பது Python execute செய்யும் ஒரு comp……
Simple Explanation
Teacher student-க்கு: "Write your name." என்று ஒரு complete instructi……
Flow
Statement ↓ Python reads it ↓……
Explanation
Some examples: Assignment sta……
Syntax
Print/function call statement
Syntax
Import statement
Syntax
Conditional statement
Common Types of Python Statements
Algorithm
1. Assignment Statement…
Algorithm
1. Expression Statement…
A function call can be used a……
Algorithm
1. Conditional Statement…
Algorithm
1. Loop Statement…
Algorithm
1. Import Statement…
Algorithm
1. Return Statement…
Inside a function: return x…
Algorithm
1. Break Statement…
break Stops a loop.…
Algorithm
1. Continue Statement…
continue Skips current loop i……
Explanation
x = 10 Assignment statement. y = 20 Assignment statement. total = x +……
Comparison
Variable vs Expression vs Statement
Comparison
Easy Example total = price * quantity Here: total → Variable pri……
Important
இந்த line மிகவும் முக்கியம்: x = ……
Important
- → Operator…
Important
10 + 20 → Expression x = 10 +……
Common Mistake
Error 1
= and == confuse செய்வது…
Practice
Assignment
x = 10 Means: 10 value-ஐ x-க்……
Comparison
x == 10 Means: x value 10-க்க……
Common Mistake
Error 2
Variable name quotes உள்ளே எழ……
Because "x" is string. Correc……
Common Mistake
Error 3
Undefined Variable Wrong: print(total) without ……
Common Mistake
Error 4
Expression and Statement same என்று நினைப்பது Express……
Common Mistake
Error 5
Invalid Variable Name Wrong: ……
Memory Trick
Variable Variable = Name x Expression Expression = Calculate x + y Statement Stateme……
TRB Point
TRB Point 1
A variable is a name that ref……
TRB Point
TRB Point 2
The assignment operator is: =…
TRB Point
TRB Point 3
An expression produces a valu……
TRB Point
TRB Point 4
A statement is a complete ins……
TRB Point
TRB Point 5
In: x = a + b a + b is an exp……
TRB Point
TRB Point 6
The complete: x = a + b is an……
TRB Point
TRB Point 7
Python variable names are cas……
TRB Point
TRB Point 8
Variable names cannot begin w……
TRB Point
TRB Point 9
Python keywords cannot normal……
TRB Point
TRB Point 10
= means assignment, while == ……
Interview Point
Question 1
What is a variable in Python? Answer A variable is a name that……
Interview Point
Question 2
What is an expression in Python? Answer An expression is a……
Explanation
Example
x + y…
Interview Point
Question 3
What is a statement? Answer A statement is a complete instruc……
Interview Point
Question 4
What is the difference between = and ==? Answer = is the assignment opera……
Interview Point
Question 5
Is x + y an expression or statement? Answe……
Interview Point
Question 6
In result = x + y, what is the expression? Answ……
MCQ
Which is a valid variable ass……
MCQ
Which of the following is an ……
MCQ
In: x = 10 + 20 Which is the ……
MCQ
What is the value of x? x = 1……
MCQ
Which is an invalid variable ……
MCQ
What does = represent in Pyth……
MCQ
Which operator checks equalit……
MCQ
What is the output? x = 5 y =……
MCQ
What is the output? x = 10 pr……
MCQ
What is the result? 2 + 3 * 4…
MCQ 11
Which statement assigns the same value to three variables? A. x,……
MCQ
What is the output? a = 10 b ……
Practice
Practice 1
Create three variables: name ……
Practice
Practice 2
Write an expression to add: 2……
Practice
Practice 3
Find the variable, expression, and statement: total = price * quantit……
Practice
Practice 4
Find the output: x = 5 y = 2 ……
Practice
Practice 5
Find the output: x = 10 x = x……
Practice
Practice 6
Correct the invalid variable:……
Practice
Practice 7
What is the difference? x = 10 and: x ……
Practice
Practice 8
Evaluate: 10 + 2 * 5 Answer: ……
Practice
Practice 9
Evaluate: (10 + 2) * 5 Answer……
Practice
Practice 10
Write a program using: two variables one a……
Program
Example
Summary
Variable என்பது value-ஐ refer செய்யும் பெயர். Variable assignment = operator மூலம் செய்யப்படுகிறது. Python va……
Quick Revision
Variable → Name referring to a value x = 10 → Assignment x → Variable 10 → Value = → Assignment operator Expr……
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