இந்த பகுதியில் Python-ன் மூன்று முக்கியமான basic……
Tuple assignment, operator precedence, and comments.
1. Tuple Assignment
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Intermediate
26 min
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45 programs 11 MCQs v2
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Definition
1. Tuple Assignment…
Definition
Tuple Assignment என்பது multiple value……
Explanation
Example
x, y = 10, 20 இதில்: x → 10 y → 20 Simple definit……
List
1. Operator Precedence…
Explanation
Operator Precedence என்பது ஒரு expression-ல் multiple operators இருந்தால் எந்……
Algorithm
1. Comments…
Comments என்பது programmer explanation அல்லது no……
This is a comment
Simple definition: Programmer-க்கு பு……
Simple Explanation
Tuple Assignment Normally: x = 10 y = 20 Tuple assignment பயன்படுத்தினால்: x, y = 10, 20 இரண்டும் same re……
Explanation
Example
10 + 5 * 2 Wrong thinking: 10 + 5 = 15 15 * 2 = 30 P……
Student age
Student age
என்பது programmer note. Pytho……
மட்டுமே execute ஆகும்.…
Flow
Tuple Assignment Flow Multiple variables ↓ ……
Explanation
Example
a, b, c = 10, 20, 30 Flow: a ← 10 b ← 20 c ← 30 Operator Precedence Flow Expression ↓ Parentheses check ↓ Hig……
comment
This program adds two numbers
Program
Inline comment
Explanation
Program 1
Tuple Assignment x, y = 10, 20…
Tuple assignment is also commonly called:
Multiple Assignment…
Explanation
Example
name, age, mark = "Arun", 20,……
Explanation
name, age, mark = "Arun", 20,……
Dry Run
Assignment happens based on p……
Important
Number of variables and values normally must match. Correct: x, y = 10, 20 Wrong: x, y = 10,……
Tuple Unpacking
Suppose: data = (10, 20, 30) ……
Explanation
data = (100, 200, 300) x, y, ……
Important
Tuple syntax usually uses parentheses: (10, 20, 30) But p……
Tuple Packing
Multiple values combined into……
This is called: Tuple Packing…
Concept
10 20 30 ↓ Packed together ↓ ……
Tuple Unpacking
Tuple values separated into v……
Concept
(10, 20, 30) ↓ Unpack ↓ a = 1……
Comparison
Packing vs Unpacking
Swapping Variables Using Tuple Assignment
Python-ல் two variables value……
Program
Need
Python: x, y = y, x…
Explanation
x, y = y, x…
Explanation
Initially: x = 10 y = 20 Statement: x, y = y, x Right side ……
Important
Other languages-ல் swap செய்ய temporary variable தேவைப்படலா……
Memory Trick
Tuple Assignment: Left ↔ Righ……
Remember
1st → 1st 2nd → 2nd 3rd → 3rd…
TRB Point
Tuple assignment allows multiple vari……
Explanation
Example
x, y = 10, 20…
Interview Point
Question
What is tuple assignment in Python? Answer Tuple assignment allows multip……
Interview Point
Question
How do you swap two variables in Python? Answer Use tuple assi……
Definition
Operator precedence determines which operati……
Explanation
Example
2 + 3 * 4 Both + and * are present. Python must decide: Additi……
Simple Explanation
School maths-ல்: 2 + 3 × 4 Mu……
Explanation
Expression: 2 + 3 * 4 Operators: + * - h……
Important
Basic Operator Precedence Order For beginner/exam understanding, remember roughly: Parentheses () E……
Memory Trick
Basic arithmetic: P E M D A S P → Parentheses E → Exponent M → Multiplication D → Divi……
Program
Example 1
Calculation: 2 * 5 = 10 10 + ……
Program
Example 2
Calculation: 10 + 2 = 12 12 *……
Important
Parentheses have very high priority. So whene……
Exponentiation Precedence
Explanation
Example
2 ** 3 Means: 2 × 2 × 2 Answe……
Why? First: 3 ** 2 = 9 Then: ……
Important
** has higher precedence than……
Same Precedence Operators
Explanation
Example
20 / 5 * 2 / and * have similar precedence level. Eva……
Important
Most same-level arithmetic operators associ……
Explanation
Example
2 ** 3 ** 2 Python interprets it l……
TRB Point
Exponentiation in Python is r……
Comparison Operator Precedence
Explanation
Example
10 + 5 > 12 Arithmetic occurs……
Output
Result
Logical Operator Precedence
Logical operators: not and or Precedence among them: no……
Why? First: False and False…
Output
Result
Then: True or False…
Output
Result
Important
When expressions become complex, don't depend only ……
Common Mistake
Error 1
Always Left to Right என்று நி……
Explanation
Example
2 + 3 * 4 Python does not sim……
Common Mistake
Error 2
Parentheses Ignore செய்வது (2……
Common Mistake
Error 3
** same as * என்று நினைப்பது ……
Explanation
Example
2 * 3 → 6 2 ** 3 → 8…
Memory Trick
For arithmetic: Bracket Power……
Remember
() → ** → *, /, //, % → +, -…
TRB Point
TRB Point 1
Operator precedence determine……
TRB Point
TRB Point 2
Parentheses can change the or……
TRB Point
TRB Point 3
Exponentiation ** has higher ……
TRB Point
TRB Point 4
Multiplication and division hav……
TRB Point
TRB Point 5
Logical precedence: not > and……
Interview Point
Question
What is operator precedence? Answer Operator precedence determines the order in whic……
Interview Point
Question
How can you control precedence explicitly? ……
Explanation
Example
(2 + 3) * 4…
Definition
A comment is explanatory text included in source……
Simple Explanation
Suppose code: x = 10 y = 20 print(x + y) Later பார்க்……
Add two numbers
Now program purpose easy-ஆக ப……
Flow
Programmer writes comment ↓ Python sees # ↓ R……
comment text
Calculate total
Program
Inline comment
This program adds two numbers
Display the result
This program adds two numbers
Comment. Python does not exec……
Program
Line 3
Display the result
Comment. Line 5:…
Single-Line Comment
Most common Python comment us……
Program
Python program
The comment does not appear i……
Inline Comment
Comment can also appear after……
Program
Example
Program
Python executes
Student age
Multiple Comment Lines
If multiple comment lines are……
This program
calculates the sum
of two numbers
Important
Python does not have a special dedicated block-comment synt……
comment line 1
comment line 2
comment line 3
Important
You may see: """ This is some text across multiple lines """ This is technically a triple……
Docstring
A docstring documents: Module……
Program
Example
Explanation
Here: """Return the sum of tw……
Comparison
Comment vs Docstring
Important
Why Comments Are Useful Comments help in: Understanding code ……
Common Mistake
Error 1
Comment output-ல் வரும் என்று……
Hello
Hello does not print.…
Common Mistake
Error 2
// comment என்று நினைப்பது In……
comment
Common Mistake
Error 3
# inside a string comment என்……
Program
Example
Why? Because # is inside quotes……
= Comment
→ Note for humans
Code → Instruction for Python…
TRB Point
TRB Point 1
Python single-line comments b……
TRB Point
TRB Point 2
Comments are ignored during n……
TRB Point
TRB Point 3
Comments improve code readabi……
TRB Point
TRB Point 4
Triple-quoted strings are not……
TRB Point
TRB Point 5
A docstring is used to docume……
Interview Point
Question
How do you write comments in Python? Answer Single-line comments begin w……
Interview Point
Question
What is the difference between a comment and a docstring? Answer A comment uses # and……
Comparison
Tuple Assignment vs Operator Precedence vs Comments
Important
Three Concepts in One Program…
Assign two values
x, y = 10, 20…
Multiplication is evaluated before addition
Here: x, y = 10, 20 → Tuple A……
Assign two values
→ Comment…
Why? First: y * 2 20 * 2 = 40……
MCQ
Which is an example of tuple ……
MCQ
What is the value of y? x, y ……
MCQ
What is the output? x, y = 5,……
MCQ
What is the result? 2 + 3 * 4…
MCQ
What is the result? (2 + 3) *……
MCQ
Which operator has higher pre……
MCQ
What is the result? 2 ** 3…
MCQ
Which symbol starts a Python ……
MCQ 9
What is the output?…
print("Hello")
B. Python C. Hello Python D. ……
MCQ
What is the output? print("#H……
is inside a string, so it is not treated as a comment.
MCQ
What is the output? a, b, c =……
MCQ
What is the result? 10 + 20 /……
Practice
Practice 1
Assign three values using one sta……
Practice
Practice 2
Swap these variables: a = 100……
Practice
Practice 3
Find the output: x, y = 5, 3 print(……
Practice
Practice 4
Find the output: print((5 + 3……
Practice
Practice 5
Find the output: print(2 ** 3……
Practice
Practice 6
Write a comment explaining this……
Add two numbers
Practice
Practice 7
What happens? x, y = 10, 20, 30 Answer: The num……
Practice
Practice 8
Identify: data = 10, 20, 30 A……
Practice
Practice 9
Identify: a, b, c = data Answ……
First value
Second value
Answer: 52…
Summary
Tuple assignment assigns multiple values to multiple variables in one statement. x, y = 10, 20 is tuple assig……
inside a string is not a comment.
Multiple comment lines can each begin with #. Doc……
Quick Revision
x, y = 10, 20 → Tuple Assignment data = 10, 20 → Tuple Packing x, y = data ……
Quick Revision
- / // % → Before + -…
Quick Revision
2 + 3 * 4 → 14 (2 + 3) * 4 → ……
→ Python comment
Comments → Not executed "#Hello" → String, not comment Mem……
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