Courses TRB CSI Python Programming Data types (int, float, Boolean, string, and list),

Python Data Types - int, float, Boolean, string, and list

Data Type என்பது ஒரு variable எந்த வகையான value-ஐ store செய்கிறது என்பதை Python-க்கு தெரிவிக்கும் classification. Simple definition: ஒரு data என்ன type என்பதை காட்டுவது Data Type.

Free Beginner 26 min 196 cards 31 programs 16 MCQs v2

Definition

Meaning

Data Type என்பது ஒரு variable எந்த வகையான value-ஐ store செய்கிறது என்பதை Python-க்கு தெரிவிக்கும் classification.

01Simple definition

ஒரு data என்ன type என்பதை காட்டுவது Data Type.

Program

Example

Python 1 lines Copy

1x = 10

x = 10

Explain Full screen Save

Explanation

இங்கு 10 ஒரு integer value.

அதனால்

x → int data type.

Another example

name = "Python"

இங்கு "Python" text.

அதனால்

name → str data type.

இந்த topic-ல் நாம் பார்க்கும் முக்கிய Python data types

int

float

bool

str

list

Explains the program above

Simple Explanation

Core idea

ஒரு வீட்டில் different containers இருப்பது போல நினைத்துக் கொள்ளுங்கள்.

01Detail 01

Rice வைக்க ஒரு container.

02Detail 02

Water வைக்க ஒரு bottle.

03Detail 03

Books வைக்க ஒரு shelf.

04Detail 04

அதே மாதிரி programming-ல் different kinds of values இருக்கும்.

Program

Example

Python 1 lines Copy

1age = 25

age = 25

Explain Full screen Save

Explanation

Core idea

25 → whole number.

01அதனால்

int

Explains the program above

Program

Python 1 lines Copy

1price = 99.50

price = 99.50

Explain Full screen Save

Explanation

Core idea

99.50 → decimal number.

01அதனால்

float

Explains the program above

Program

Python 1 lines Copy

1passed = True

passed = True

Explain Full screen Save

Explanation

Core idea

True → logical value.

01அதனால்

bool

02Detail 02

name = "Arun"

03Detail 03

"Arun" → text.

04அதனால்

str

05Detail 05

marks = [80, 90, 75]

06Detail 06

Multiple values collection.

07அதனால்

list

08Detail 08

Simple Memory

09Detail 09

int → முழு எண்

10Detail 10

float → decimal number

11Detail 11

bool → True / False

12Detail 12

str → Text

13Detail 13

list → Multiple values

Explains the program above

Flow

1. 1Value கொடுக்கிறோம்
2. 2Python அந்த value-ஐ பார்க்கிறது
3. 3அதற்கான Data Type determine செய்கிறது
4. 4Variable அந்த value-ஐ reference செய்கிறது
5. 5Program அதை process செய்கிறது

Program

Example

Python 1 lines Copy

1x = 100

x = 100

Explain Full screen Save

Explanation

Core idea

Five Data Types Flow

01Flow

1. 1100
2. 2Whole Number
3. 3Integer
4. 4int
5. 5x stores/references the value

02Detail 02

1. 1Whole Number
2. 2int

03Detail 03

1. 1Decimal Number
2. 2float

04Detail 04

1. 1True / False
2. 2bool

05Detail 05

1. 1Text
2. 2str

06Detail 06

1. 1Collection of Values
2. 2list

Explains the program above

Syntax

Python 2 lines Copy

1Integer
2variable = integer_value

Integer variable = integer_value

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Program

Example

Python 3 lines Copy

1age = 25
2Float
3variable = decimal_value

age = 25 Float variable = decimal_value

Explain Full screen Save

Program

Example

Python 3 lines Copy

1price = 45.75
2Boolean
3variable = True

price = 45.75 Boolean variable = True

Explain Full screen Save

Explanation

Core idea

or

Explains the program above

Program

Python 1 lines Copy

1variable = False

variable = False

Explain Full screen Save

Program

Example

Python 3 lines Copy

1is_active = True
2String
3variable = "text"

is_active = True String variable = "text"

Explain Full screen Save

Explanation

Example

Core idea

name = "Python"

01String single quotes-லும் எழுதலாம்

name = 'Python'
List
variable = [value1, value2, value3]

02Detail 02

marks = [80, 90, 75]

Explains the program above

Program

Program 1

Python 2 lines Copy

1Integer
2age = 25

Integer age = 25

Explain Full screen Save

Program

Python 2 lines Copy

1print(age)
2print(type(age))

print(age) print(type(age))

Verified output

25
<class 'int'>

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

Run Explain Full screen Save

Output

Copy Expand

25
<class 'int'>

Line by Line

1

age = 25

age என்ற variable-க்கு 25 assign செய்கிறோம். 25 ஒரு whole number. அதனால் அதன் data type: int

2

print(age)

age variable-ல் இருக்கும் value display செய்கிறது. Output: 25

3

print(type(age))

type() function ஒரு value அல்லது variable எந்த data type என்பதை கண்டுபிடிக்க பயன்படுத்தப்படுகிறது. Output: <class 'int'>

Dry Run

Execution traceRead top to bottom · highlighted cells show the current value3 states

Step	Statement	Value	Data Type	Output
01Iteration 1	age = 25	25	int	-
02Iteration 2	print(age)	25	int	25
03Iteration 3	type(age)	25	int	<class 'int'>

Important

1. 01

   int என்பது decimal point இல்லாத whole numbers-க்கு பயன்படுத்தப்படுகிறது.

2. 02Examples

   10

3. 03

   -10

4. 04

   0

5. 05

   500

6. 06

   -999

7. 07இவை எல்லாம்

   int

Common Mistake

01Wrong understanding

10.0 ஒரு integer.

இல்லை.

x = 10.0

02இது

float

because decimal point இருக்கிறது.

Memory Trick

INT = Integer = முழு எண்

Decimal point இல்லை → int

TRB Point

1. 01

   Python integer data type is represented by int.

2. 02Examples

   10

3. 03

   0

4. 04

   -25

5. 05

   500

Interview Point

Question

What is an integer in Python?

Answer

An integer is a whole number without a decimal point. Python represents integer values using the int data type.

MCQ

31What is the data type of: x = 100

A float B int C str D list

Choose one answer Try again

Integer என்பது whole numbers store செய்ய பயன்படும் data type.

01Examples

10
20
0
-50
1000

02Positive number

Program

Python 1 lines Copy

1x = 100

x = 100

Explain Full screen Save

01Negative number

x = -100

02Zero

Program

Python 1 lines Copy

1x = 0

x = 0

Verified output

All are int.

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

Run Explain Full screen Save

Output

Copy Expand

All are int.

Program

Python 3 lines Copy

1Integer Arithmetic
2a = 10
3b = 5

Integer Arithmetic a = 10 b = 5

Explain Full screen Save

Program

Python 3 lines Copy

1print(a + b)
2print(a - b)
3print(a * b)

print(a + b) print(a - b) print(a * b)

Verified output

15
5
50
Integer Check
x = 50

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

Run Explain Full screen Save

Output

Copy Expand

15
5
50
Integer Check
x = 50

Program

Python 1 lines Copy

1print(type(x))

print(type(x))

Verified output

<class 'int'>

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

Run Explain Full screen Save

Output

Copy Expand

<class 'int'>

Definition

Meaning

Float என்பது decimal point கொண்ட numeric values store செய்ய பயன்படும் Python data type.

01Examples

10.5
3.14
99.99
-7.5
0.0

Simple Explanation

Whole number

10

→ int

Decimal number

10.5

→ float

Simple

Point இருந்தால் பொதுவாக float என்று நினைவில் வைத்துக்கொள்ளலாம்.

Flow

1. 1Decimal Value
2. 2Python identifies decimal point
3. 3Floating-point number
4. 4float

Program

Example

Python 1 lines Copy

1price = 99.50

price = 99.50

Explain Full screen Save

Explanation

Core idea

1. 199.50
2. 2Decimal number
3. 3float

Explains the program above

Syntax

Python 1 lines Copy

1variable = decimal_value

variable = decimal_value

Explain Full screen Save

Program

Example

Python 1 lines Copy

1height = 5.8

height = 5.8

Explain Full screen Save

Program

Python 1 lines Copy

1price = 99.50

price = 99.50

Explain Full screen Save

Program

Python 2 lines Copy

1print(price)
2print(type(price))

print(price) print(type(price))

Verified output

99.5
<class 'float'>

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

Run Explain Full screen Save

Output

Copy Expand

99.5
<class 'float'>

Line by Line

1

price = 99.50

price variable-க்கு decimal value assign செய்கிறோம். அதனால்: price → float

2

print(price)

Output:

3

print(type(price))

Output:

Dry Run

Execution traceRead top to bottom · highlighted cells show the current value3 states

Step	Statement	Value	Type	Output
01Iteration 1	price = 99.50	99.5	float	-
02Iteration 2	print(price)	99.5	float	99.5
03Iteration 3	type(price)	99.5	float	<class 'float'>

Important

1. 01இந்த value

   10

2. 02

   → int

3. 03இந்த value

   10.0

4. 04

   → float

5. 05

   Value mathematically same போல இருந்தாலும் Python data type different.

Common Mistake

Context

x = 5.

01இது கூட

float

because decimal notation பயன்படுத்தப்பட்டுள்ளது.

02Check

print(type(5.0))

Output

Copy Expand

<class 'float'>

Memory Trick

FLOAT = Floating decimal point

Decimal point → float

TRB Point

Python floating-point numbers are represented using the float data type.

Interview Point

Question

What is the difference between int and float?

Answer

int stores whole numbers without a decimal point. float stores floating-point or decimal numbers.

MCQ

63What is the type of: x = 25.0

A int B float C str D bool

Choose one answer Try again

Definition

Meaning

Boolean என்பது True அல்லது False என்ற இரண்டு logical values-ஐ represent செய்யும் data type.

01Python Boolean type

bool

02Values

• True
• False

Simple Explanation

Core idea

Boolean-ஐ ஒரு Yes / No switch போல நினைக்கலாம்.

01Detail 01

Yes → True

02Detail 02

No → False

Program

Example

Python 1 lines Copy

1is_student = True

is_student = True

Verified output

True

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

Run Explain Full screen Save

Definition

Meaning

Meaning

Student ஆ? → Yes.

Key termis_absent = False

Definition

Meaning

Meaning

Absent ஆ? → No.

Flow

1. 1Condition check
2. 2Condition correct என்றால்
3. 3True

1. 1Condition wrong என்றால்
2. 2False

Explanation

Example

Core idea

10 > 5

01Detail 01

10 greater than 5.

02Detail 02

Yes.

Output

Result

Copy Expand

True

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

Important

1. 01Correct

   True

2. 02

   False

3. 03Wrong

   true

4. 04

   false

5. 05

   Python case-sensitive.

Program

Python 1 lines Copy

1passed = True

passed = True

Explain Full screen Save

Program

Python 2 lines Copy

1print(passed)
2print(type(passed))

print(passed) print(type(passed))

Verified output

True
<class 'bool'>

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

Run Explain Full screen Save

Output

Copy Expand

True
<class 'bool'>

Line by Line

1

passed = True

passed variable-க்கு Boolean value True assign செய்யப்படுகிறது.

2

print(passed)

Output:

3

print(type(passed))

Output:

Dry Run

Execution traceRead top to bottom · highlighted cells show the current value3 states

Step	Expression	Meaning	Result
01Iteration 1	10 > 5	Is 10 greater than 5?	True
02Iteration 2	10 < 5	Is 10 less than 5?	False
03Iteration 3	10 == 10	Are both equal?	True

Important

1. 01Boolean values

   True

2. 02

   False

3. 03

   Capital T and capital F முக்கியம்.

4. 04Correct

   x = True

5. 05Wrong

   x = true

6. 06Wrong code gives

   NameError

7. 07

   because Python true என்பதை variable name போல எடுத்துக்கொள்ளும்.

Common Mistake

01Students often write

• TRUE
• FALSE

02அல்லது

• true
• false

03Correct Python Boolean

• True
• False

Memory Trick

BOOL = Boolean = Two values

True / False

TRB Point

The Boolean data type in Python has two values: True and False.

Interview Point

Question

What is Boolean data type in Python?

Answer

The Boolean data type represents logical values. Python uses True and False, and its type name is bool.

MCQ

87Which is a valid Python Boolean value?

A true B TRUE C True D T

Choose one answer Try again

Definition

Meaning

String என்பது characters அல்லது text-ஐ represent செய்யும் sequence data type.

01Python string type

str

Explanation

Example

Core idea

name = "Python"

Simple Explanation

Core idea

Letters, words, sentences, numbers-as-text போன்றவற்றை quotes உள்ளே எழுதினால் அது string.

Explanation

Example

Core idea

"Hello"

01Detail 01

→ String

02Detail 02

"Python Programming"

03Detail 03

→ String

04Detail 04

"123"

05Detail 05

→ இதுவும் String.

06Detail 06

ஏன்?

07Detail 07

123 quotes உள்ளே இருக்கிறது.

Flow

1. 1Characters
2. 2Quotes உள்ளே எழுதுகிறோம்
3. 3Python அதை text என்று எடுத்துக்கொள்கிறது
4. 4str

Explanation

Example

Core idea

"369 Tesla"

01Detail 01

1. 1Text
2. 2String
3. 3str

02Double quotes

variable = "text"

03Single quotes

variable = 'text'

04Detail 04

name = "Python"

05Detail 05

or

06Detail 06

name = 'Python'

07Detail 07

இரண்டும் valid.

08Detail 08

name = "Python"

Program

Python 2 lines Copy

1print(name)
2print(type(name))

print(name) print(type(name))

Verified output

Python
<class 'str'>

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

Run Explain Full screen Save

Output

Copy Expand

Python
<class 'str'>

Line by Line

1

name = "Python"

name variable-க்கு "Python" text assign செய்கிறோம். Quotes உள்ளதால் Python அதை string-ஆக எடுத்துக்கொள்கிறது.

2

print(name)

Output:

3

print(type(name))

Output:

Table

Character	P	y	t	h	o	n
Index	0	1	2	3	4	5

Explanation

Core idea

print(word[0])

01Program

word = "Python"

02Output

P
Negative Index
word = "Python"

03Detail 03

print(word[-1])

04Output

n

05Detail 05

-1 → last character.

06Detail 06

String Concatenation
first = "Hello"
second = "Python"

07Detail 07

print(first + " " + second)

08Output

Hello Python

09Detail 09

- strings-ல் concatenation செய்யும்.

10Detail 10

String Repetition
print("Hi " * 3)

11Output

Hi Hi Hi
Length of String
name = "Python"

12Detail 12

print(len(name))

13Output

6

Program

Python 2 lines Copy

1name = "Python"
2print(name[0])

name = "Python" print(name[0])

Verified output

<class 'int'>
<class 'str'>

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

Run Explain Full screen Save

Dry Run

Execution traceRead top to bottom · highlighted cells show the current value3 states

Step	Statement	Value	Output
01Iteration 1	name = "Python"	Python	-
02Iteration 2	name[0]	First character	P
03Iteration 3	print()	P	P

Important

1. 01Quotes difference

   123

2. 02

   → int

3. 03But

   "123"

4. 04

   → str

5. 05Check

   print(type(123))

6. 06

   print(type("123"))

Output

Copy Expand

<class 'int'>
<class 'str'>

Common Mistake

01Wrong

name = Python

Python இதை text என்று எடுத்துக்கொள்ளாது.

Python என்ற variable இருக்கிறதா என்று பார்க்கும்.

02If not defined

NameError

03Correct

name = "Python"

Memory Trick

STR = String = Text

Quotes உள்ளே → String.

TRB Point

Strings in Python are sequences of characters enclosed within quotes and are represented by the str type.

Interview Point

Question

What is a string in Python?

Answer

A string is a sequence of characters used to represent text. Python strings can be written using single or double quotation marks.

MCQ

108What is the data type of: x = "100"

A int B float C str D list

Choose one answer Try again

Definition

Meaning

List என்பது multiple values-ஐ ஒரே variable-ல் ordered collection ஆக store செய்யும் Python data type.

01List square brackets பயன்படுத்துகிறது

[]

Explanation

Example

Core idea

marks = [80, 90, 70]

Simple Explanation

Core idea

ஒரு student-க்கு 5 marks இருக்கிறது என்று வைத்துக்கொள்வோம்.

01Separate variables

m1 = 80
m2 = 90
m3 = 70
m4 = 85
m5 = 95

02இப்படி எழுதுவதற்குப் பதிலாக

marks = [80, 90, 70, 85, 95]

03Detail 03

ஒரே variable-ல் multiple values store செய்யலாம்.

04Detail 04

இதுதான் list.

Flow

1. 1Multiple Values
2. 2Square Brackets [ ]
3. 3Comma-separated items
4. 4Ordered Collection
5. 5list

Explanation

Example

Core idea

[10, 20, 30]

01Detail 01

1. 1Multiple values
2. 2List

02Detail 02

list_name = [item1, item2, item3]

03Detail 03

numbers = [10, 20, 30]

04Strings list

languages = ["Python", "Java", "C"]

05Mixed list

data = [10, 5.5, "Python", True]

06Detail 06

Python list different data types-ஐ contain செய்ய முடியும்.

07Detail 07

numbers = [10, 20, 30]

Program

Python 2 lines Copy

1print(numbers)
2print(type(numbers))

print(numbers) print(type(numbers))

Verified output

[10, 20, 30]
<class 'list'>

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

Run Explain Full screen Save

Output

Copy Expand

[10, 20, 30]
<class 'list'>

Line by Line

1

numbers = [10, 20, 30]

numbers என்ற variable-ல் 3 integer values list ஆக store செய்யப்பட்டுள்ளன.

2

print(numbers)

Output:

3

print(type(numbers))

Output:

Table

Value	10	20	30
Index	0	1	2

Explanation

Core idea

List is mutable.

01Program

print(numbers[0])

02Output

10
Second Element
print(numbers[1])

03Output

20
Last Element
print(numbers[-1])

04Output

30
Change a List Value

05Detail 05

Mutable என்றால் value-ஐ change செய்யலாம்.

06Example

numbers = [10, 20, 30]

07Detail 07

numbers[1] = 200

08Detail 08

print(numbers)

09Output

[10, 200, 30]
Add Element - append()
numbers = [10, 20, 30]

10Detail 10

numbers.append(40)

11Detail 11

print(numbers)

12Output

[10, 20, 30, 40]
Remove Element
numbers = [10, 20, 30]

13Detail 13

numbers.remove(20)

14Detail 14

print(numbers)

15Output

[10, 30]
List Length
numbers = [10, 20, 30, 40]

16Detail 16

print(len(numbers))

17Output

4

Program

Python 3 lines Copy

1numbers = [10, 20, 30]
2numbers.append(40)
3print(numbers)

numbers = [10, 20, 30] numbers.append(40) print(numbers)

Explain Full screen Save

Dry Run

Execution traceRead top to bottom · highlighted cells show the current value3 states

Step	Statement	List Value	Output
01Iteration 1	Create list	[10,20,30]	-
02Iteration 2	append(40)	[10,20,30,40]	-
03Iteration 3	print(numbers)	[10,20,30,40]	[10,20,30,40]

Important

1. 01List properties

   Ordered

2. 02

   Indexed

3. 03

   Mutable

4. 04

   Allows duplicate values

5. 05

   Can contain different data types

Explanation

Example

Core idea

data = [10, 10, "Python", 5.5, True]

01Detail 01

Valid list.

Common Mistake

01List uses

[]

02Correct

x = [10, 20, 30]

03Students sometimes confuse with

(10, 20, 30)

This is a tuple, not a list.

Memory Trick

LIST = List of many values

[] → List.

TRB Point

A Python list is an ordered and mutable collection represented using square brackets.

Interview Point

Question

What is a list in Python?

Answer

A list is an ordered, mutable collection of values. It is represented using square brackets and can contain duplicate as well as mixed data types.

Comparison

int vs float vs bool vs str vs list

Data Type	Meaning	Example	Symbol / Form
int	Whole number	10	Number
float	Decimal number	10.5	Decimal
bool	Logical value	True	True/False
str	Text	"Python"	Quotes
list	Multiple values	[10,20]	[ ]

Comparison

More Detailed Comparison

Point	int	float	bool	str	list
Example	10	10.5	True	"Hi"	[10,20]
Numeric?	Yes	Yes	Logical	No	Collection
Quotes needed?	No	No	No	Yes	Depends on items
Multiple values?	No	No	No	Characters	Yes
Indexed?	No	No	No	Yes	Yes
Mutable?	Not in-place	Not in-place	Not in-place	No	Yes

Important

1. 01

   Python Automatically Determines Data Type

2. 02

   Python-ல் usually variable declaration-ல் type எழுத வேண்டியதில்லை.

3. 03C/C++ style

   int x = 10;

4. 04Python

   x = 10

5. 05

   Python automatically

6. 0610 பார்த்து

   int

7. 07

   என்று determine செய்கிறது.

8. 08

   இதனை dynamic typing உடன் தொடர்புபடுத்தலாம்.

Important

1. 01

   type() Function

2. 02Data type check செய்ய

   type(value)

Program

Example

Python 2 lines Copy

1x = 10
2print(type(x))

x = 10 print(type(x))

Verified output

<class 'int'>
All Types Example
a = 10
b = 10.5
c = True
d = "Python"
e = [10, 20, 30]

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

Run Explain Full screen Save

Output

Copy Expand

<class 'int'>
All Types Example
a = 10
b = 10.5
c = True
d = "Python"
e = [10, 20, 30]

Program

Python 5 lines Copy

1print(type(a))
2print(type(b))
3print(type(c))
4print(type(d))
5print(type(e))

print(type(a)) print(type(b)) print(type(c)) print(type(d)) print(type(e))

Verified output

<class 'int'>
<class 'float'>
<class 'bool'>
<class 'str'>
<class 'list'>

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

Run Explain Full screen Save

Output

Copy Expand

<class 'int'>
<class 'float'>
<class 'bool'>
<class 'str'>
<class 'list'>

Explanation

Core idea

a = 10

01Detail 01

10 whole number.

02Detail 02

Type → int.

03Detail 03

b = 10.5

04Detail 04

Decimal value.

05Detail 05

Type → float.

06Detail 06

c = True

07Detail 07

Logical value.

08Detail 08

Type → bool.

09Detail 09

d = "Python"

10Detail 10

Text inside quotes.

11Detail 11

Type → str.

12Detail 12

e = [10, 20, 30]

13Detail 13

Multiple values inside square brackets.

14Detail 14

Type → list.

Dry Run

Execution traceRead top to bottom · highlighted cells show the current value5 states

Trace	Variable	Value	Python identifies as
01	a	10	int
02	b	10.5	float
03	c	True	bool
04	d	"Python"	str
05	e	[10,20,30]	list

Common Mistake

Error 1

10 and "10" same என்று நினைப்பது
10 → int

"10" → str

Completely different types.

Common Mistake

Error 2

True quotes உள்ளே எழுதுவது
x = True → bool

But:

x = "True" → str

Common Mistake

Error 3

List brackets confuse செய்வது
[1, 2, 3] → list

"1, 2, 3" → string

Common Mistake

Error 4

Context

bool value lowercase

01Wrong

x = false

02Correct

x = False

Common Mistake

Error 5

Float-ஐ int என்று நினைப்பது
x = 10.0

Type:

float

Memory Trick

01ஒரே line-ல் நினைவில் வைத்துக்கொள்ளுங்கள் · I F B S L

• I → Integer
• F → Float
• B → Boolean
• S → String
• L → List

02Memory sentence

• Integer Float Boolean String List
• Visual Memory
• 10 → int
• 10.5 → float
• True → bool
• "10" → str
• [10] → list

03ஒரே 10 value-ஐ five formats-ல் பாருங்கள்

• 10
• 10.0
• True
• "10"
• [10]

04Types

• int
• float
• bool
• str
• list

TRB Point

TRB Point 1

int represents whole numbers.

TRB Point

TRB Point 2

float represents floating-point numbers.

TRB Point

TRB Point 3

1. 01Boolean values are

   True

2. 02

   False

TRB Point

TRB Point 4

Python Boolean type is:

bool

TRB Point

TRB Point 5

String type is:

str

TRB Point

TRB Point 6

Strings are enclosed in quotes.

TRB Point

TRB Point 7

1. 01Lists use

   [ ]

2. 02

   square brackets.

TRB Point

TRB Point 8

List is mutable.

TRB Point

TRB Point 9

String is immutable.

TRB Point

TRB Point 10

Python type() function identifies the type of an object.

TRB Point

TRB Point 11

1. 01

   10

2. 02

   is int.

TRB Point

TRB Point 12

1. 01

   10.0

2. 02

   is float.

TRB Point

TRB Point 13

1. 01

   "10"

2. 02

   is str.

TRB Point

TRB Point 14

1. 01

   [10]

2. 02

   is list.

TRB Point

TRB Point 15

Python is dynamically typed; explicit variable type declaration is generally not required.

Interview Point

Question 1

What is a data type?

Answer

A data type identifies what kind of value an object represents and what operations are appropriate for it. Examples include integer, float, Boolean, string and list.

Interview Point

Question 2

How do you find a variable's type in Python?

Answer

The built-in type() function is used.

Program

Example

Python 2 lines Copy

1x = 10
2print(type(x))

x = 10 print(type(x))

Explain Full screen Save

Interview Point

Question 3

What is the difference between 10 and "10"?

Answer

10 is an integer, while "10" is a string because it is enclosed in quotation marks.

Interview Point

Question 4

What is the difference between a string and a list?

Answer

A string is an immutable sequence of characters. A list is a mutable ordered collection that can contain multiple values and different data types.

Interview Point

Question 5

Can a Python list contain different data types?

Answer

Yes.

Explanation

Example

Core idea

data = [10, "Python", 5.5, True]

MCQ

166What is the type of: x = -50

A float B bool C int D str

Choose one answer Try again

MCQ

167What is the type of: x = 5.0

A int B float C string D list

Choose one answer Try again

MCQ

168Which one is Boolean?

A "True" B true C True D "true"

Choose one answer Try again

MCQ

169What is the type of: x = "Python"

A str B list C bool D float

Choose one answer Try again

MCQ

170Which symbol is used to create a list?

A { } B ( ) C [ ] D < >

Choose one answer Try again

MCQ

171What is the output? x = [10, 20, 30] print(x[0])

A 0 B 10 C 20 D 30

Choose one answer Try again

MCQ

172What is the output? x = "Python" print(x[1])

A P B y C t D h

Choose one answer Try again

MCQ

173What is the type of: x = "100"

A int B float C str D bool

Choose one answer Try again

MCQ

174What is the type of: x = [100]

A int B list C str D tuple

Choose one answer Try again

MCQ

175Which is mutable?

A int B float C str D list

Choose one answer Try again

MCQ

176What is the output? print(type(False))

A <class 'str'> B <class 'bool'> C <class 'int'> D <class 'list'>

Choose one answer Try again

MCQ

177What is the output? x = [10, 20] x.append(30) print(x)

A [10, 20] B [30] C [10, 20, 30] D Error

Choose one answer Try again

Practice

Practice 1

Identify the data types:

a = 100
b = 9.5
c = False
d = "Computer"
e = [1, 2, 3]

Answer:

a

int

b

float

c

bool

d

str

e

list

Practice

Practice 2

Use type() and check:

x = 500

Practice

Practice 3

Create a float variable called salary.

Program

Example

Python 1 lines Copy

1salary = 25000.50

salary = 25000.50

Verified output

200

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

Run Explain Full screen Save

Practice

Practice 4

Create a Boolean variable:

is_passed = True

Practice

Practice 5

Create a string containing your name.

name = "Your Name"

Practice

Practice 6

Create a list containing 5 marks.

marks = [80, 90, 75, 85, 95]

Practice

Practice 7

Print the second element:

numbers = [100, 200, 300]

Answer:

print(numbers[1])

Output

Copy Expand

200

Practice

Practice 8

Find the output:

x = "10"
y = "20"

print(x + y)

Output

Copy Expand

1020

Reason:

Both are strings.

List

• performs concatenation.

Practice

Practice 9

Find the output:

x = 10
y = 20

print(x + y)

Output

Copy Expand

30

Reason:

Both are integers.

Practice

Practice 10

Find the difference:

x = True
y = "True"

Answer:

x

bool

y

str

Summary

1. 01Data type identifies what kind of valueis stored or represented.
2. 02intis used for whole numbers.
3. 03floatis used for decimal numbers.
4. 04bool represents True and False.
5. 05str represents text.
6. 06liststores multiple ordered values.
7. 07type() identifies an object's datatype.
8. 08Stringsuse quotes.
9. 09Listsuse square brackets [ ].
10. 10List indexingstarts from 0.
11. 11Stringsare indexed from 0.
12. 12Listsare mutable.
13. 13Stringsare immutable.
14. 1410 and "10"are different.
15. 15True and "True"are different.
16. 16Python generallydetermines types automatically at runtime.

Quick Revision

1. 0110 → int
2. 0210.5 → float
3. 03True → bool
4. 04"Python" → str
5. 05[10, 20] → list
6. 06type() → Find data type
7. 07[] → List
8. 08Quotes → String
9. 09True / False → Boolean
10. 10Decimal point → Float
11. 11Whole number → Integer
12. 12List → Ordered + Mutable
13. 13String → Sequence of characters +Immutable
14. 14Indexstarts at → 0
15. 15Python → Dynamically typedlanguage