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Python Casting

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Casting in Python refers to converting one data type to another manually using built-in functions.

Although Python is dynamically typed (automatically detects data types), sometimes you need to explicitly convert values from one type to another.

🔄 Types of Type Casting in Python

Python provides the following built-in functions for casting:

Function Purpose
int() Converts to integer
float() Converts to float
str() Converts to string
bool() Converts to boolean
🧮 1. Convert to Integer — int()

Used to convert a number or a numeric string to an integer.

x = int(5.6)        # Result: 5
y = int("10")       # Result: 10

❗ Cannot convert non-numeric strings:

int("abc")  # Error
🔢 2. Convert to Float — float()

Converts integer or numeric string to float.

a = float(7)        # Result: 7.0
b = float("3.14")   # Result: 3.14
🔤 3. Convert to String — str()

Converts numbers or other data types to string.

x = str(100)        # Result: "100"
y = str(3.14)       # Result: "3.14"
✅ 4. Convert to Boolean — bool()

  • bool(0), bool(""), bool(None) return False

  • All other values return True

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

🧠 Why Use Casting?

  • To perform operations between different types

  • To store data in a specific format

  • To avoid type errors in calculations or concatenation

✅ Summary Table

From To Method Example Result
float int int(5.6) 5
int float float(2) 2.0
number string str(100) "100"
string int int("25") 25
any boolean bool(value) True / False

Practice Questions

Q1. Write a Python program to convert the float 3.7 to an integer using int().

Q2. Write a Python program to convert the string "25" to an integer using int().

Q3. Write a Python program to convert the number 100 to a string and print its type.

Q4. Write a Python program to convert the integer 50 to a float using float().

Q5. Write a Python program to try converting the string "abc" to an integer and observe the error.

Q6. Write a Python program to convert an empty string "" to boolean and display the result.

Q7. Write a Python program to use str() to convert a boolean value to a string and print it.

Q8. Write a Python program to convert the string "7.5" to a float using float().

Q9. Write a Python program to convert a non-zero number like 10 to boolean and print the result.

Q10. Write a Python program to convert a float value 5.99 to a string using str() and check its type.

Python Casting Quiz

Q1: What is type casting in Python?

A. Automatically assigning a data type
B. Removing variables
C. Converting from one data type to another
D. Declaring data types

Q2: Which function converts a float to an integer?

A. str()
B. int()
C. bool()
D. float()

Q3: What does str() do in Python?

A. Checks for strings
B. Converts values to string
C. Declares a string variable
D. Adds quotation marks

Q4: What is the output of bool(0)?

A. 0
B. 1
C. True
D. False

Q5: What will happen if you use int("abc")?

A. Returns 0
B. Returns 'abc'
C. Error
D. Converts it to ASCII

Q6: Which of the following will return True?

A. bool(0)
B. bool("")
C. bool(None)
D. bool("Hello")

Q7: How do you convert 100 into a string?

A. str(100)
B. "100" + 100
C. convert(100)
D. string(100)

Q8: Which data type conversion is invalid?

A. float("3.14")
B. str(10)
C. int("10a")
D. int(5.9)

Q9: What function should be used to convert a number to float?

A. int()
B. str()
C. float()
D. bool()

Q10: Which of the following returns False?

A. bool("Python")
B. bool(1)
C. bool("")
D. bool([1, 2])
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