Data Types 1

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Learning outcomes

• explain int, float, bool, and str
• check data types using type()
• convert values safely between basic types

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What is a data type?

• kind of value stored
• operations allowed on that value

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Core scalar types

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int

x = 42

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float

y = 6.75

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bool

is_pass = True

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str

name = "Python"

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Checking type

x = 12
print(type(x))

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Type conversion

a = int("25")
b = float("2.5")
c = str(100)

# int("2.5")  # ValueError

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Type conversion and boolean

bool(0)      # False
bool(1)      # True
bool("")     # False
bool("abc")  # True

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Exam-focused points

• type() returns class/type of object
• invalid conversion raises ValueError
• bool is a subclass of integer in Python behavior (True == 1, False == 0)

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Practice questions

1. Predict type and output:

x = 5
y = 2.0
print(x + y)
print(type(x + y))

2. Take a decimal input and print integer part.
3. Write examples where conversion fails and explain why.