Data Types

Python is dynamically typed, which means you do not need to declare variable types explicitly.

Integer

Integers represent whole numbers.

age = 18

print(age)
print(type(age))

Output

18
<class 'int'>

Float

Floats represent decimal numbers.

price = 19.99

print(price)
print(type(price))

Output

19.99
<class 'float'>

String

Strings represent text.

name = "Alice"

print(name)
print(type(name))

Output

Alice
<class 'str'>

String Formatting

name = "Alice"
age = 20

print(f"{name} is {age} years old")

Output

Alice is 20 years old

Boolean

Booleans represent truth values.

is_active = True

print(is_active)
print(type(is_active))

Output

True
<class 'bool'>

None

None represents the absence of a value.

result = None

print(result)
print(type(result))

Output

None
<class 'NoneType'>

Type Conversion

Convert values between different types.

age = "18"

print(int(age))
print(float(age))

Output

18
18.0

Check a Type

Use type() to inspect a value's type.

name = "Alice"

print(type(name))

Output

<class 'str'>

Common Built-in Types

Type	Description	Example
int	Integer	18
float	Decimal number	19.99
str	Text	"Hello"
bool	Boolean value	True
NoneType	Empty value	None

Summary

• int stores whole numbers
• float stores decimal numbers
• str stores text
• bool stores True or False
• None represents no value
• Use type() to inspect a type
• Use functions such as int(), float(), and str() for type conversion

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