Courses TRB CSI Python Programming Boolean values and operators,

Boolean values and operators

Boolean is a built-in data type in Python that can have only two values: True and False. தமிழில்: ஒரு condition உண்மையா அல்லது பொய்யா என்பதை காட்டும் Python data type தான் Boolean.

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Boolean Values and Operators - Python
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Python-ல் ஒரு condition True அல்லது False என்பதை represent செய்ய பயன்படுத்தப்படும் values தான் Boolean values.

Boolean என்பது programming-ல்:

Yes / No
Correct / Wrong
True / False

போன்ற இரண்டு நிலைகளை represent செய்கிறது.

Definition

Meaning

Boolean is a built-in data type in Python that can have only two values: True and False.

01தமிழில்

ஒரு condition உண்மையா அல்லது பொய்யா என்பதை காட்டும் Python data type தான் Boolean.

Explanation

Boolean values

Python-ல் இரண்டு Boolean values மட்டுமே உள்ளன

True
False

Important

முக்கியம்

1. 01

   True

2. 02

   False

3. 03

   இவற்றின் முதல் letter Capital letter ஆக இருக்க வேண்டும்.

4. 04Correct

   True

5. 05

   False

6. 06Wrong

   true

7. 07

   false

Simple Explanation

Core idea

10 என்பது 5-ஐ விட பெரியது.

01Suppose

10 > 5

02அதனால் result

True

Program

Example

Python 1 lines Copy

1print(10 > 5)

print(10 > 5)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

Program

ஆனால்

Python 1 lines Copy

1print(10 < 5)

print(10 < 5)

Verified output

False

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

False

Explanation

Boolean data type

Python Boolean data type

bool

Explains the program above

Program

Example

Python 1 lines Copy

1x = True

x = True

Explain Full screen Save

Program

Python 1 lines Copy

1print(type(x))

print(type(x))

Verified output

<class 'bool'>

Learning Run Mode — this is the output the author verified, not a live execution.

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Output

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<class 'bool'>

Flow

Boolean condition எப்படி work ஆகிறது?

1. 1Expression
2. 2Condition Check
3. 3True / False

Explanation

Example

Core idea

1. 110 > 5
2. 2Is 10 greater than 5?
3. 3Yes
4. 4True

01Detail 01

Boolean variable:

Syntax

Python 1 lines Copy

1variable = True

variable = True

Explain Full screen Save

Explanation

Core idea

or

Explains the program above

Syntax

Python 1 lines Copy

1variable = False

variable = False

Explain Full screen Save

Program

Example

Python 1 lines Copy

1is_student = True

is_student = True

Explain Full screen Save

Program

Python 2 lines Copy

1a = True
2b = False

a = True b = False

Explain Full screen Save

Program

Python 2 lines Copy

1print(a)
2print(b)

print(a) print(b)

Verified output

True
False

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

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True
False

Explanation

Core idea

a = True

01Detail 01

a என்ற variable-க்கு Boolean value True assign செய்கிறோம்.

02Detail 02

b = False

03Detail 03

b variable-க்கு False assign செய்கிறோம்.

Explanation

Boolean expression

Core idea

ஒரு expression result True அல்லது False ஆக வந்தால் அது Boolean expression.

01Detail 01

5 > 2

Output

Result

Copy Expand

True

Explanation

Example

Core idea

10 == 20

Explains the program above

Output

Result

Copy Expand

False

Explanation

Boolean operators

Core idea

Boolean conditions உருவாக்குவதற்கு முக்கியமாக இரண்டு வகை operators புரிந்துகொள்ள வேண்டும்:

01Detail 01

Comparison Operators
Logical Operators

Explains the program above

Explanation

Core idea

1. COMPARISON OPERATORS

Explanation

Core idea

இரண்டு values-ஐ compare செய்து True அல்லது False result தரும் operators தான் Comparison Operators.

Table

Operator	Meaning
==	Equal to
!=	Not equal to
>	Greater than
<	Less than
>=	Greater than or equal to
<=	Less than or equal to

Explanation

1. == equal to

Core idea

== இரண்டு values equal-ஆ இருக்கிறதா என்று check செய்கிறது.

Program

Example

Python 1 lines Copy

1print(10 == 10)

print(10 == 10)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

Program

Example

Python 1 lines Copy

1print(10 == 20)

print(10 == 20)

Verified output

False

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

False

Important

1. 01

   = மற்றும் == இரண்டும் different.

2. 02

   x = 10

3. 03

   = → Assignment operator.

4. 04

   x == 10

5. 05

   == → Comparison operator.

Memory Trick

=

Store

==

Compare

Explanation

2. != not equal to

Core idea

!= இரண்டு values unequal-ஆ இருக்கிறதா என்று check செய்கிறது.

Program

Example

Python 1 lines Copy

1print(10 != 20)

print(10 != 20)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

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Output

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True

Because:

10 and 20 are different

Program

Example

Python 1 lines Copy

1print(10 != 10)

print(10 != 10)

Verified output

False

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

False

Explanation

3. > greater than

Core idea

Left-side value right-side value-ஐ விட பெரியதா?

01Detail 01

print(20 > 10)

Explains the program above

Output

Copy Expand

True

Explanation

4. < less than

Core idea

print(5 < 10)

Explains the program above

Output

Copy Expand

True

Explanation

5. >= greater than or equal to

Core idea

இதில் இரண்டு possibilities.

01Detail 01

• Greater than
• OR
• Equal to

Explains the program above

Program

Example

Python 1 lines Copy

1print(10 >= 5)

print(10 >= 5)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

Program

Example

Python 1 lines Copy

1print(10 >= 10)

print(10 >= 10)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

இங்கே 10 == 10 என்பதால் கூட True.

Program

Example

Python 1 lines Copy

1print(5 <= 10)

print(5 <= 10)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

Program

Example

Python 1 lines Copy

1print(10 <= 10)

print(10 <= 10)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

Program

Comparison program

Python 2 lines Copy

1a = 10
2b = 20

a = 10 b = 20

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Program

Python 6 lines Copy

1print(a == b)
2print(a != b)
3print(a > b)
4print(a < b)
5print(a >= b)
6print(a <= b)

print(a == b) print(a != b) print(a > b) print(a < b) print(a >= b) print(a <= b)

Verified output

False
True
False
True
False
True

Learning Run Mode — this is the output the author verified, not a live execution.

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Output

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False
True
False
True
False
True

Dry Run

Object walkthroughFollow creation, available members and the resulting object state1 stage

1. 01
   Given

   a = 10
   b = 20

   a == b
   10 == 20

   False

   a != b
   10 != 20

   True

   a > b
   10 > 20

   False

   a < b
   10 < 20

   True

1. LOGICAL OPERATORS

Explanation

Core idea

• Python-ல் three major logical operators உள்ளன:
• and
• or
• not

Table

Logical operators table

Operator	Meaning
and	Both conditions must be True
or	Any one condition can be True
not	Reverses Boolean value

Explanation

1. and operator

Core idea

and operator-ல் இரண்டு conditions-மும் True ஆக இருந்தால் மட்டுமே result True.

01Detail 01

Truth Table

Table

A	B	A and B
True	True	True
True	False	False
False	True	False
False	False	False

Memory Trick

AND = ALL True

எல்லாமே True இருந்தால் மட்டுமே True.

Program

Python 1 lines Copy

1a = 10

a = 10

Explain Full screen Save

Program

Python 1 lines Copy

1print(a > 5 and a < 20)

print(a > 5 and a < 20)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Explanation

Check

10 > 5 → True

10 < 20 → True

So

True and True

Explains the program above

Output

Result

Copy Expand

True

Real Life Example

And example 2

Context

a = 10

print(a > 5 and a > 50)

01Check

• 10 > 5 → True
• 10 > 50 → False

02Therefore

True and False

Output

Result

Copy Expand

False

Real Life Example

Real time example

01ஒரு student exam pass செய்ய

• Theory >= 40
• AND
• Practical >= 40
• இரண்டிலும் pass ஆக வேண்டும்.
• theory = 60
• practical = 50
• print(theory >= 40 and practical >= 40)

Output

Copy Expand

True

Explanation

2. or operator

Core idea

or operator-ல் minimum ஒரு condition True இருந்தாலும் result True.

01Detail 01

Truth Table

Explains the program above

Table

A	B	A or B
True	True	True
True	False	True
False	True	True
False	False	False

Memory Trick

OR = ONE True is enough

ஒரு condition True இருந்தாலே result True.

Program

Python 1 lines Copy

1a = 10

a = 10

Explain Full screen Save

Program

Python 1 lines Copy

1print(a > 5 or a > 100)

print(a > 5 or a > 100)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Explanation

Check

10 > 5 → True

10 > 100 → False

Therefore

True or False

Explains the program above

Output

Copy Expand

True

Real Life Example

Real time example

01ஒரு user login செய்ய

• Email verified
• OR
• Mobile verified
• ஒரு verification இருந்தாலும் access allow செய்வதாக வைத்துக்கொள்வோம்.
• email_verified = False
• mobile_verified = True
• print(email_verified or mobile_verified)

Output

Copy Expand

True

Explanation

3. not operator

Core idea

not existing Boolean value-ஐ reverse செய்கிறது.

01Detail 01

True

False

False

True

Explains the program above

Table

Truth table

A	not A
True	False
False	True

Program

Python 1 lines Copy

1x = True

x = True

Explain Full screen Save

Program

Python 1 lines Copy

1print(not x)

print(not x)

Verified output

False

Learning Run Mode — this is the output the author verified, not a live execution.

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Output

Copy Expand

False

Real Life Example

Another example

Context

print(not 10 > 5)

01First · 10 > 5

True

02Then

not True

Output

Result

Copy Expand

False

Explanation

Boolean and if

Core idea

Boolean values மிகவும் அதிகமாக if condition-ல் பயன்படுத்தப்படுகிறது.

Explains the program above

Program

Example

Python 1 lines Copy

1age = 20

age = 20

Explain Full screen Save

Program

Python 2 lines Copy

1if age >= 18:
2    print("Eligible")

if age >= 18: print("Eligible")

Explain Full screen Save

Explanation

Core idea

Boolean expression.

01Here

age >= 18

02Detail 02

For:

Explains the program above

Program

Python 1 lines Copy

1age = 20

age = 20

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Explanation

Condition

20 >= 18

Explains the program above

Output

Result

Copy Expand

True

அதனால் if block execute ஆகிறது.

Explanation

Bool function

Core idea

Python-ல் bool() function பயன்படுத்தி ஒரு value-ஐ Boolean-ஆ evaluate செய்யலாம்.

01Detail 01

bool(value)

Program

Python 2 lines Copy

1print(bool(10))
2print(bool(0))

print(bool(10)) print(bool(0))

Verified output

True
False

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

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True
False

Explanation

Truthy and falsy

Core idea

Python-ல் True மற்றும் False மட்டும் இல்லாமல் other values-உம் Boolean context-ல் True/False போல behave செய்யும்.

01இதை

Truthy
Falsy

02Detail 02

என்று சொல்வார்கள்.

Explains the program above

Explanation

Falsy values

Common False-like values

False
0
0.0
None
""
[]
()
{}
set()

Program

Example

Python 3 lines Copy

1print(bool(0))
2print(bool(""))
3print(bool([]))

print(bool(0)) print(bool("")) print(bool([]))

Verified output

False
False
False

Learning Run Mode — this is the output the author verified, not a live execution.

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Output

Copy Expand

False
False
False

Explanation

Truthy values

Core idea

Most non-empty / non-zero values are Truthy.

Explains the program above

Program

Example

Python 4 lines Copy

1print(bool(100))
2print(bool(-5))
3print(bool("Python"))
4print(bool([1, 2]))

print(bool(100)) print(bool(-5)) print(bool("Python")) print(bool([1, 2]))

Verified output

True
True
True
True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True
True
True
True

Important

கவனிக்கவும்:

bool("False")

Output

Copy Expand

True

ஏன்?

Because "False" என்பது Boolean False கிடையாது.

அது ஒரு non-empty string.

Therefore:

True

Common Mistake

01Wrong understanding

bool("0")

Result False என்று நினைக்கக்கூடாது.

02Actual result

True

Because "0" என்பது non-empty string.

03Compare

bool(0)

Output

Copy Expand

False

But:

bool("0")

Output

Copy Expand

True

Explanation

Boolean with numbers

Python-ல் internally

True = 1
False = 0

Explains the program above

Program

Example

Python 1 lines Copy

1print(True + True)

print(True + True)

Verified output

2

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

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2

Because:

1 + 1 = 2

Program

Example

Python 1 lines Copy

1print(True + False)

print(True + False)

Verified output

1

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

1

TRB Point

Important exam point

Python-ல்:

True == 1

Output

Result

Copy Expand

True

And:

False == 0

Output

Result

Copy Expand

True

Program

Python 2 lines Copy

1print(True == 1)
2print(False == 0)

print(True == 1) print(False == 0)

Verified output

True
True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True
True

Explanation

Boolean with strings

Core idea

Strings-ஐ கூட compare செய்யலாம்.

01Detail 01

print("Python" == "Python")

Explains the program above

Output

Copy Expand

True

Program

But

Python 1 lines Copy

1print("Python" == "python")

print("Python" == "python")

Verified output

False

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

False

Because Python is case-sensitive.

Comparison

Chained comparison

Core idea

Python supports chained comparisons.

Program

Example

Python 1 lines Copy

1x = 10

x = 10

Explain Full screen Save

Program

Python 1 lines Copy

1print(5 < x < 20)

print(5 < x < 20)

Explain Full screen Save

Program

Equivalent

Python 1 lines Copy

1print(5 < x and x < 20)

print(5 < x and x < 20)

Verified output

True

Learning Run Mode — this is the output the author verified, not a live execution.

Run Explain Full screen Save

Output

Copy Expand

True

Explanation

Operator precedence

Core idea

Boolean operations-ல் precedence முக்கியம்.

01General order

1. 1Comparison
2. 2not
3. 3and
4. 4or

02Among logical operators

not > and > or

Explains the program above

Memory Trick

NOT first, AND next, OR last

Real Life Example

Example

print(True or False and False)

First:

False and False

Output

Result

Copy Expand

False

Then:

True or False

Output

Result

Copy Expand

True

Explanation

Parenthesis

Core idea

Confusion avoid செய்ய parentheses use செய்வது best.

01Result

= (a > 5) and (b < 20)

Explains the program above

Comparison

and vs or

and	or
All conditions True	At least one True
Strict	Flexible
False one வந்தாலும் False	True one வந்தாலும் True

Comparison

= vs ==

=	==
Assignment	Comparison
Value store செய்கிறது	Values compare செய்கிறது
x = 10	x == 10

Common Mistake

Error 1

01Wrong

true

02Correct

True

Common Mistake

Error 2

Wrong:

if x = 10:

Correct:

if x == 10:

Common Mistake

Error 3

01Wrong

True AND False

02Correct

True and False

03Python logical operators lowercase

• and
• or
• not

Common Mistake

Error 4

10 > 5 & 10 < 20

Boolean logic-க்கு normally:

10 > 5 and 10 < 20

Use செய்ய வேண்டும்.

Memory Trick

Context

• Boolean
• Boolean → True / False
• AND

01AND → ALL

All conditions True.

OR

02OR → ONE

One True enough.

NOT
NOT → Opposite

TRB Point

1. Boolean type name in Python?

TRB Point

bool

TRB Point

1. Boolean values?

TRB Point

1. 01

   True

2. 02

   False

TRB Point

1. Logical operators?

TRB Point

1. 01

   and

2. 02

   or

3. 03

   not

TRB Point

1. Equality operator?

TRB Point

==

TRB Point

1. Not equal operator?

TRB Point

!=

TRB Point

1. True and False?

TRB Point

False

TRB Point

1. True or False?

TRB Point

True

TRB Point

1. not True?

TRB Point

False

TRB Point

1. bool(0)?

TRB Point

False

TRB Point

1. bool("Python")?

TRB Point

True

Interview Point

Context

Question: What is Boolean in Python?

01Boolean is a built-in data type representing two logical values

True
False
Question: What is the difference between and and or?

and returns True only when all required conditions are True.

or returns True when at least one condition is True.

Question: Is Boolean a subclass of integer in Python?

Yes.

02This is why

True == 1

03returns

• True
• and
• False == 0

04returns

True

MCQ

175Which are valid Boolean values in Python?

A true, false B TRUE, FALSE C True, False D Yes, No

Choose one answer Try again

MCQ

176What is the output? print(5 > 3)

A 5 B 3 C True D False

Choose one answer Try again

MCQ

177What is the output? print(True and False)

A True B False C 1 D Error

Choose one answer Try again

MCQ

178What is the output? print(True or False)

A True B False C Error D None

Choose one answer Try again

MCQ

179What is the output? print(not False)

A False B 0 C True D None

Choose one answer Try again

MCQ

180Which operator checks equality?

A = B == C != D >=

Choose one answer Try again

MCQ

181What is the output? print(bool(0))

A True B False C 0 D Error

Choose one answer Try again

MCQ

182What is the output? print(bool("Hello"))

A False B True C Hello D Error

Choose one answer Try again

MCQ

183What is the output? print(True + True)

A True B 1 C 2 D Error

Choose one answer Try again

MCQ

184Which has highest priority among these?

A or B and C not D All same

Choose one answer Try again

Practice

Predict the outputs:

1.
print(10 >= 10)

Answer:

True
2.
print(20 != 20)

Answer:

False
3.
print(False or True)

Answer:

True
4.
print(False and True)

Answer:

False
5.
print(not (5 > 2))

Answer:

False
6.
print(bool([]))

Answer:

False
7.
print(bool([0]))

Answer:

True

Important: [0] list empty இல்லை. அதனால் True.

Summary

1. 01Boolean
2. 02│
3. 03├── True
4. 04└── False
5. 05Comparison Operators
6. 06== Equalal
7. 07!= Not Equalal
8. 08Greater Than
9. 09< Less Thanhan
10. 10= Greater Than or Equalal
11. 11<= Less Than or Equalal
12. 12Logical Operators
13. 13and → All True required
14. 14or → One True enoughh
15. 15not → Reverse
16. 16Truth table shortcut
17. 17True and True → Trueue
18. 18True and False → Falsee
19. 19True or False → Trueue
20. 20False or False → Falsee
21. 21not True → False→ False
22. 22not False → True→ True

Explanation

Short description

Core idea

Boolean என்பது Python-ல் True மற்றும் False என்ற இரண்டு logical values-ஐ represent செய்யும் built-in data type. Comparison operators conditions உருவாக்கும்; and, or, not போன்ற logical operators multiple Boolean conditions-ஐ combine அல்லது reverse செய்ய பயன்படும்.