Python Falsy Values

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the output of the Python code: print(5 < 3)?

  • False (correct)
  • True
  • Error
  • None

What is the output of the Python code: print(3 == 3)?

  • Error
  • False
  • None
  • True (correct)

What is the output of the Python code: print(True and False)?

  • False (correct)
  • True
  • Error
  • None

What is the output of the Python code: print(True or False)?

<p>True (D)</p> Signup and view all the answers

What is the default boolean value for most objects in Python?

<p>True (C)</p> Signup and view all the answers

What is the purpose of the bool() function in Python?

<p>To convert a value to a boolean (C)</p> Signup and view all the answers

What is the output of the Python code: print(5 > 3)?

<p>True (B)</p> Signup and view all the answers

What is the output of the Python code: print(False or False)?

<p>False (D)</p> Signup and view all the answers

What is the boolean value of the string ""

<p>False (D)</p> Signup and view all the answers

Which of the following numeric values is considered True in a boolean context?

<p>1 (D)</p> Signup and view all the answers

What is the purpose of the bool() method in a class?

<p>To define the boolean value of an object (D)</p> Signup and view all the answers

What happens if a class does not define the bool() method?

<p>Python calls the <strong>len</strong>() method (B)</p> Signup and view all the answers

What is the output of the code print(bool(None))?

<p>False (D)</p> Signup and view all the answers

What is the purpose of the if statement in Python?

<p>To check a condition and execute a block of code (C)</p> Signup and view all the answers

What is the output of the code x = False; if x: print('x was True!')?

<p>I will be printed in any case where x is not true (C)</p> Signup and view all the answers

What is the purpose of the elif statement in Python?

<p>To check another condition if the previous one is false (D)</p> Signup and view all the answers

What is the purpose of using elif statements in Python?

<p>To provide an alternative condition to check if the initial condition is false (C)</p> Signup and view all the answers

What happens when a True boolean is encountered in a nested if statement?

<p>The code below the True boolean is executed (A)</p> Signup and view all the answers

What is the output of the code: if person == 'Sammy': print('Welcome Sammy!') elif person =='George': print('Welcome George!') else: print('Welcome, whats your name?') if person = 'Sammy' is true?

<p>Welcome Sammy! (D)</p> Signup and view all the answers

What is the purpose of indentation in Python?

<p>To maintain the structure and order of the code (D)</p> Signup and view all the answers

What is the output of the code: if True and True and True or False: print('Hello')?

<p>Hello (B)</p> Signup and view all the answers

What is the output of the code: a= 1; b= 2; if a == 1 | b== 2: print('Hello')?

<p>Hello (C)</p> Signup and view all the answers

What is the primary purpose of if statements in Python?

<p>To allow the computer to perform alternative actions based on a certain set of results (A)</p> Signup and view all the answers

What is the output of the code: if 5>3 and 4>8 or 8==1: print('Hello')?

<p>Nothing (A)</p> Signup and view all the answers

What is the result of the comparison operator 5 &gt; 3 in Python?

<p>True (A)</p> Signup and view all the answers

What is the output of the code: if person == 'Sammy': print('Welcome Sammy!'); print('Hello'); print('Welcome')?

<p>Welcome Sammy!HelloWelcome (A)</p> Signup and view all the answers

What is the purpose of the elif statement in Python?

<p>To perform an action if a specific condition is true, but not the first one (C)</p> Signup and view all the answers

What is the syntax for an if statement with multiple conditions in Python?

<p>if case1: perform action1 elif case2: perform action2 (B)</p> Signup and view all the answers

What is the purpose of the else statement in Python?

<p>To perform an action if none of the above conditions are true (B)</p> Signup and view all the answers

What is the result of the comparison operator 5 = 6 in Python?

<p>SyntaxError (D)</p> Signup and view all the answers

What is the purpose of comparison operators in Python?

<p>To allow the code to evaluate conditions and make logical comparisons (D)</p> Signup and view all the answers

What is the result of the comparison operator 3 == 3 in Python?

<p>True (D)</p> Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

Boolean Values in Python

  • In Python, there are several built-in objects considered "falsy" and evaluated as False in a boolean context.
  • Falsy objects include:
    • Constants defined to be false: None and False
    • Zero of any numeric type: 0, 0.0, 0j, Decimal(0), Fraction(0, 1)
    • Empty sequences and collections: '', (), [], {}, set(), range(0)
  • An object's boolean value can also be defined by its class using the bool() method.
  • If a class does not define bool(), Python calls len() method, where an object is False if its length is zero.

If Statements in Python

  • If statements allow us to tell the computer to perform alternative actions based on a certain set of results.
  • Verbally, we can imagine we are telling the computer: "Hey if this case happens, perform some action."
  • If statements can be expanded with elif and else statements to perform different actions based on different conditions.

Syntax Format for If Statements

  • The syntax format for if statements is:
if case1:
    perform action1
elif case2:
    perform action2
else:
    perform action3

Comparison Operators in Python

  • Comparison operators in Python compare the values on either side of them and determine the relation between them.
  • The result of these comparisons is a boolean value, either True or False.
  • Examples of comparison operators include:
    • > (greater than)
    • < (less than)
    • == (equal to)
    • != (not equal to)

Logical Operations in Python

  • Logical operators in Python include and and or.
  • The and operator returns True if both operands are True.
  • The or operator returns True if at least one of the operands is True.
  • Examples of logical operations include:
    • print(True and True) # Returns True
    • print(True or True) # Returns True
    • print(True and False) # Returns False
    • print(True or False) # Returns True

Boolean Conversion

  • The bool() function is used to convert a value to a boolean (True or False).
  • By default, most objects are considered True.
  • Boolean conversion can help you see what if is related to what elif or else statements.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser