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Home Interviews What is Python Casting with example? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 15 Sep 2025
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Python, casting (also called type conversion) means converting a value from one data type to another.

There are two main types:

1. Implicit Casting (Type Conversion)

Done automatically by Python (no data loss).

For example, when combining an integer with a float:

x = 5      # int
y = 2.5    # float

z = x + y  # Python automatically converts `x` to float
print(z)   # 7.5
print(type(z))  # <class 'float'>

2. Explicit Casting (Type Conversion)

Done manually by the programmer using functions:

  • int() → converts to integer
  • float() → converts to floating-point number
  • str() → converts to string
  • bool() → converts to boolean

Examples:

# String to integer
a = int("10")
print(a, type(a))   # 10 <class 'int'>

# Float to integer (decimal part is truncated)
b = int(9.8)
print(b, type(b))   # 9 <class 'int'>

# Integer to float
c = float(5)
print(c, type(c))   # 5.0 <class 'float'>

# Number to string
d = str(123)
print(d, type(d))   # "123" <class 'str'>

# String to float
e = float("3.14")
print(e, type(e))   # 3.14 <class 'float'>

# Any non-zero number becomes True
f = bool(1)
print(f, type(f))   # True <class 'bool'>

# Empty string or 0 becomes False
g = bool("")
print(g, type(g))   # False <class 'bool'>

Summary Table of Casting Functions in Python:

Function Converts To Example
int(x) Integer int("12") → 12
float(x) Floating number float("3.5") → 3.5
str(x) String str(99) → "99"
bool(x) Boolean bool(0) → False
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