Python Booleans

Booleans are a fundamental data type in Python that can hold one of two values: True or False. Booleans are commonly used in conditional statements and loops to control the flow of a program.

Boolean Values

In Python, Boolean values are represented by the keywords True and False.

• True represents a logical high or affirmative value.
• False represents a logical low or negative value.

is_active = True
is_student = False

is_active = True

is_student = False

Boolean Expressions

Boolean expressions are expressions that evaluate to either True or False. These expressions often involve comparison operators or logical operators.

• Comparison Operators:

These operators compare two values and return a Boolean value.

  x = 5
  y = 10
  print(x == y)  # Output: False
  print(x < y)   # Output: True

  x = 5

  y = 10

  print(x == y)  # Output: False

  print(x < y)   # Output: True

• Logical Operators:

These operators combine Boolean values and return a Boolean result.

  a = True
  b = False
  print(a and b)  # Output: False
  print(a or b)   # Output: True
  print(not a)    # Output: False

  a = True

  b = False

  print(a and b)  # Output: False

  print(a or b)   # Output: True

  print(not a)    # Output: False

Boolean Functions

Python has built-in functions that return Boolean values.

The bool() function can be used to check the truthiness of a value.

• bool() – Converts a value to a Boolean. Most values evaluate to True, except for empty collections, zero, and None.

  print(bool(1))      # Output: True
  print(bool(0))      # Output: False
  print(bool([]))     # Output: False
  print(bool([1, 2])) # Output: True

  print(bool(1))      # Output: True

  print(bool(0))      # Output: False

  print(bool([]))     # Output: False

  print(bool([1, 2])) # Output: True

Using Booleans in Conditional Statements

Booleans are often used in conditional statements to control the flow of a program.

• if Statements:

The if statement evaluates the condition and executes the corresponding block of code based on whether the condition is True or False.

  is_raining = True
  if is_raining:
      print("Take an umbrella.")
  else:
      print("Enjoy the sunshine!")

  is_raining = True

  if is_raining:

      print("Take an umbrella.")

  else:

      print("Enjoy the sunshine!")

• while Loops:

The while loop continues to execute the block of code as long as the condition is True.

  count = 0
  while count < 5:
      print("Count:", count)
      count += 1

  count = 0

  while count < 5:

      print("Count:", count)

      count += 1

Python Boolean Example Code

This program uses Boolean values and expressions in conditional statements and loops to control the flow of execution.

# Boolean values
is_active = True
is_student = False

# Comparison operators
x = 5
y = 10
print("x == y:", x == y)  # Output: False
print("x < y:", x < y)    # Output: True

# Logical operators
a = True
b = False
print("a and b:", a and b)  # Output: False
print("a or b:", a or b)    # Output: True
print("not a:", not a)      # Output: False

# Boolean function
print("bool(1):", bool(1))      # Output: True
print("bool(0):", bool(0))      # Output: False
print("bool([]):", bool([]))    # Output: False
print("bool([1, 2]):", bool([1, 2]))  # Output: True

# Using booleans in conditional statements
is_raining = True
if is_raining:
    print("Take an umbrella.")
else:
    print("Enjoy the sunshine!")

# Using booleans in while loops
count = 0
while count < 5:
    print("Count:", count)
    count += 1

# Boolean values

is_active = True

is_student = False

​

# Comparison operators

x = 5

y = 10

print("x == y:", x == y)  # Output: False

print("x < y:", x < y)    # Output: True

​

# Logical operators

a = True

b = False

print("a and b:", a and b)  # Output: False

print("a or b:", a or b)    # Output: True

print("not a:", not a)      # Output: False

​

# Boolean function

print("bool(1):", bool(1))      # Output: True

print("bool(0):", bool(0))      # Output: False

print("bool([]):", bool([]))    # Output: False

print("bool([1, 2]):", bool([1, 2]))  # Output: True

​

# Using booleans in conditional statements

is_raining = True

if is_raining:

    print("Take an umbrella.")

else:

    print("Enjoy the sunshine!")

​

# Using booleans in while loops

count = 0

while count < 5:

    print("Count:", count)

    count += 1

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