? Python Type Casting Exercises

⚡ Quick Overview

Type casting in Python means converting a value from one data type to another, such as int to float, str to int, or numbers and collections to bool. Practicing these conversions helps you avoid type errors and write more flexible, reusable code.

Python mainly uses explicit casting via built-in functions like int(), float(), str(), bool(), list(), tuple(), and set().

? Key Concepts

• Numeric casting: Convert between int and float.
• String casting: Convert numeric strings like "20" to numbers.
• Boolean casting: Use bool() to check truthiness of values.
• Collection casting: Convert between list, tuple, and set.
• Validity: Only valid numeric strings can be converted to numbers safely.

? Syntax and Theory

Common casting functions in Python:

• int(x) – converts x to an integer (truncates decimals).
• float(x) – converts x to a floating-point number.
• str(x) – converts x to a string.
• bool(x) – converts x to a Boolean (True or False).
• list(x), tuple(x), set(x) – convert between collection types.

? Basic Type Conversion Example

This example shows how to convert between int, float, and str.

x = 10      # int
y = 3.5     # float
z = "20"    # string

# int to float
print(float(x))   # 10.0

# float to int
print(int(y))     # 3

# string to int
print(int(z))     # 20

# int to string
print(str(x))     # "10"

? Converting with bool()

Use bool() to check whether values are considered “truthy” or “falsy”.

print(bool(0))       # False
print(bool(10))      # True
print(bool(""))      # False
print(bool("Hello")) # True

In general, zero, empty strings, and empty collections are False. Most other values are True.

? Converting Collections

Python allows you to freely convert between lists, tuples, and sets using their constructors.

my_list = [1, 2, 3]
my_tuple = tuple(my_list)
my_set = set(my_list)

print(my_tuple)  # (1, 2, 3)
print(my_set)    # {1, 2, 3}

tuple() creates an immutable ordered sequence, while set() creates an unordered collection of unique elements.

? Live Output and Explanation

? Exercise Templates with Type Casting

Use these small snippets as starting points for your own practice.

# Convert a string input to integer and add 10
user_input = input("Enter a number: ")
num = int(user_input)
print(num + 10)

# Convert a float to integer and print
value = 7.9
print(int(value))

# Convert a list to tuple and set
items = [1, 2, 2, 3]
print(tuple(items))
print(set(items))

# Check truthiness of various values using bool()
print(bool([]))       # False
print(bool([1, 2]))   # True
print(bool(0.0))      # False
print(bool("Python")) # True