Boolean values

• True — logical truth.
• False — logical falsehood.

Example:

x = 5
y = 3

result = x > y
print(result)        # True
print(type(result))  # <class 'bool'>

Conversion between bool and int

• True converts to 1.
• False converts to 0.
• 0 converts to False.
• Any nonzero integer converts to True.

print(int(True))   # 1
print(int(False))  # 0

print(bool(0))     # False
print(bool(42))    # True

Conversion between bool and str

• An empty string "" converts to False.
• Any non-empty string converts to True.

print(bool(""))       # False
print(bool("Hello"))  # True
print(bool("0"))      # True  # non-empty string is always True

When booleans are used

• In if, elif, while conditions.
• Returned by comparison and logical operators (<, ==, !=, and, or, not).
• As flags to represent yes/no, on/off, success/failure states in programs.

Quick practice

1. Check if the square of a number is greater than 50, and print the boolean result.
2. Convert True and False to integers and print them.
3. Ask the user for a string and print whether it is empty (False) or not (True).

# 1) Square greater than 50?
x = int(input())
print(x * x > 50)

# 2) Convert booleans to integers
print(int(True), int(False))

# 3) Check empty string
s = input("Enter text: ")
print(bool(s))