Data Type in Python,What is Data Type in Python

Python Data Types – Complete Explanation

A data type defines the pattern, size, and memory allocation of data stored in variables, constants, and methods. Python handles data types internally, so we do not need to pre-declare the type of a variable.

In Python, a single variable can store different data types at different times:

a = 10
a = "hello"
a = True

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🔹 Categories of Python Data Types

• Primitive (Basic) Data Types
• Derived (Advanced) Data Types

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1️⃣ Primitive Data Types

✔ int

Used to store integer numbers.

a = 10

✔ float

Used to store decimal numbers.

a = 12.34

✔ String

A collection of characters. Python supports multiple string formats:

• Double quotes: s = "data"
• Single quotes: s = 'data'
• Triple double-quotes (multi-line text):
  s = """This is a paragraph..."""
• Triple single-quotes (often used for multi-line comments):
  ''' comment '''

✔ String Examples

a = "
Welcome
"
print(a)

b = 'hello python'
print(b)

c = """ This is a long paragraph
that spans multiple lines.
Python supports this format easily. """
print(c)

✔ boolean

Represents True or False. Used in conditions and loops.

x = True
y = False

🔍 Interesting Boolean Behavior

In Python:

• True behaves like 1
• False behaves like 0

s = True
print(s + 1)   # Output: 2

s1 = False
print(s1 + 1)  # Output: 1

print(s + s1)  # Output: 1

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2️⃣ Derived Data Types

✔ List

Ordered, indexed, mutable collection.

✔ Tuple

Ordered, indexed, immutable collection.

✔ Dictionary

Stores data as key-value pairs.

✔ Set

Unordered collection of unique items.

✔ datetime

Used to store date and time values.

✔ Class

User-defined data type.

✔ Complex

Used to store complex numbers.

a = 2 + 3j

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🔹 Predefined Functions for Data Types

✔ type()

Displays the datatype of a variable.

a = 10
print(type(a))

a = 20.2
print(type(a))

a = 2+3j
print(type(a))

a = (10,20)
print(type(a))

a = [10,20]
print(type(a))

a = {'a':10, 'b':20}
print(type(a))

a = True
print(type(a))

a = "hello"
print(type(a))

✔ int()

Converts numeric string to integer.

a = "123"
a = int(a)    # 123

✔ float()

Converts integer or numeric string to float.

a = 12
a = float(a)     # 12.0

a = "12.34"
a = float(a)     # 12.34

✔ str()

Converts numbers to string.

a = 12
b = str(a)      # "12"
b = str(12.34)  # "12.34"

✔ ord()

Converts a character to its ASCII value.

ord('A')  # 65
ord('a')  # 97
ord('0')  # 48

A–Z → 65 to 90
a–z → 97 to 122
0–9 → 48 to 57

✔ chr()

Converts ASCII value to character.

a = 90
print(chr(a))   # Z

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📚 ASSIGNMENT PROGRAMS

• 1) WAP to convert temperature from Celsius to Fahrenheit.
• 2) WAP to perform multiplication of a complex number using complex datatype.
• 3) WAP to evaluate the middle digit of a three-digit number.

a = 132  # middle digit → 3
a = 456  # middle digit → 5
a = 546  # middle digit → 4
    

• 4) WAP to print data inside single and double quotes.

"Welcome in SCS"
'Welcome in Python'
'\n hello \n'