Conditional statement
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Questions and Answers

In the provided script, what would be the output if the user enters '29' for 'marks'?

  • Congratulations You cleared the subject
  • Congratulations You Failed
  • You cleared the subject Congratulations
  • You Failed Better Luck Next Time (correct)

    • What is the purpose of the 'elif' statement in Python?

  • To execute a block of code only if the previous 'if' condition is False. (correct)
  • To define a function that can be called later in the program.
  • To execute a block of code only if the previous 'if' and 'elif' conditions are False.
  • To create a loop that will continue running until a certain condition is met.

    • For 'marks = 50', which of the following statements are TRUE based on the provided script?

  • marks >= 50 (correct)
  • marks < 50
  • marks > 50
  • marks == 50 (correct)

    • Which line of code will be executed if the user enters '40' for 'marks'?

    <p>print(&quot; You Failed &quot;) (B), print(&quot; Better Luck Next Time &quot;) (D)</p> Signup and view all the answers

    What is the correct way to convert a string input to an integer in Python?

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

    Which of the following embodies the correct structure of an if statement in Python?

    <p>if expression: statement(s) (C)</p> Signup and view all the answers

    What happens if the condition in an if statement evaluates to FALSE?

    <p>The else statement will be executed if present. (D)</p> Signup and view all the answers

    How many else statements can be combined with a single if statement?

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

    Which of the following functions correctly checks if a variable x is equal to 5?

    <p>if x==5: print('equal') (A)</p> Signup and view all the answers

    What is the role of indentation in Python's if statements?

    <p>It groups statements that are part of a single block of code. (A)</p> Signup and view all the answers

    How would the output of the following code be?

    x=5 if x>10: print('x is greater than 10')

    <p>Nothing will be printed. (B)</p> Signup and view all the answers

    What should you do to display that a user has entered a positive integer if the integer is greater than or equal to 2?

    <p>Use if x&gt;=2: print('positive integer') (D)</p> Signup and view all the answers

    Flashcards

    if-else statement

    A conditional statement that executes code based on whether a condition is true or false.

    True statements

    Statements executed when the if condition evaluates to true.

    elif statement

    A conditional branch that allows checking multiple expressions for truth.

    else statement

    The code block that runs when all preceding conditions are false.

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    conditional flow

    The sequence of execution in a program based on boolean conditions.

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    Conditional Statements

    Control structures in Python that execute code based on conditions.

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    Structure of if Statement

    The format: if expression: followed by indented code block.

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    Logical Expression

    A condition evaluated to determine true or false in an if statement.

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    Example of if Statement

    x=5; if x==5: print('x is 5') demonstrates how if works.

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    Optional Else Statement

    An else statement is optional and can follow only one if statement.

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    Indentation in Python

    Indentation groups lines of code into blocks; critical for if statements.

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    Study Notes

    Introduction to Python - Conditional Statements

    • Conditional statements in Python allow the program to make decisions based on conditions.
    • The primary conditional statement in Python is if.
    • if statements evaluate a logical expression and, if true, execute a block of code indented under the if statement.
    • Python's indentation rules define code blocks. Statements indented the same amount belong to the same block.

    Conditional - if Statement

    • Python's if statements are similar to other programming languages.
    • The statement needs a logical expression.
    • A decision is made based on whether the expression is true or false.

    Conditional - if Structure

    • The if statement in Python Programming has a simple structure: 
      if expression:
    statement(s)
    • The statement(s) after the colon are executed only if the expression evaluates to True.
    • The expression must be a condition, like a comparison or a logical check.
    • All statements indented by the same number of spaces after a programming construct (in this case, the if statement) are considered to be part of a single code block.

    Conditional - if Example

    • x = 5
    • if x == 5:
    • print(x, 'is equal to 5')
    • if x > 10:
    • print (x, 'is greater than 10')

    Conditional - if (Indentation Concept)

    • Indentation is crucial in Python to define code blocks.
    • The block of code directly under an 'if statement' is solely dependent upon the if expression being true.
    • Incorrect indentation leads to errors.

    Exercise 1

    • Write a Python program that prompts the user for an integer.
    • If the integer is greater than or equal to 2, display that the integer is positive.

    Conditional - if-else Statement

    • An else statement can be combined with an if statement.
    • An else statement contains the code that executes if the if statement's condition is false.
    • The else statement (if used) must be indented at the same level as the if statement
    • An if-else statement has at most one else statement.

    Conditional - if-else Statements

    • if (Test condition): If the condition evaluates to True, the corresponding code block will execute.

    • else: If the condition is False, the else block will execute.

    Conditional - if-elif-else Statements

    • An elif statement allows multiple conditions to be evaluated.
    • elif can be used multiple times after if.
    • The if-elif-else structure continues to test conditions until it finds one that evaluates to True.
    • Python only executes the code block for the first condition that evaluates as True.
    • Once a True condition is found the rest of the elif and else conditions are bypassed.

    if-elif-else Syntax

    if (condition 1):
   statements 1
elif (condition 2):
   statements 2
elif (condition 3):
   statements 3
.
.
elif (condition n):
   statements n
else:
    default statements

    Exercise 2

    • Provide the output for a given integer input value, based on a sample if/else script.
    • Determine the true statement(s) when a specific value is given.
    • State which line of the given code will execute with a specific integer input.

    Exercise 3

    • A Python script uses if, elif, and else to determine different discount rates based on age.
    • Determine the different outputs when specific ages are inputted.

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    Python Conditional Statements PDF

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