Python Functions and Conditional Statements
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Questions and Answers

Which part of a function definition is used to identify what the function does?

  • Docstring (correct)
  • Function name
  • Return statement
  • Parameters

    • In Python, all function parameters are passed by value.

    False

    What is the purpose of a return statement in a function?

    To return a value from the function.

    The keyword ___ marks the start of a function header.

    <p>def</p> Signup and view all the answers

    Match the following components of a function with their descriptions:

    <p>Function name = Identifies the function uniquely Parameters = Values passed to the function Docstring = Explains what the function does Function body = Contains the statements that execute</p> Signup and view all the answers

    Which statement will be executed when the condition in an if statement is true?

    <p>The statements inside the if block</p> Signup and view all the answers

    An if-else statement can only execute one block regardless of how many conditions are present.

    <p>True</p> Signup and view all the answers

    What is the primary purpose of conditional statements in programming?

    <p>To control the flow of program execution based on conditions.</p> Signup and view all the answers

    In Python, the structure used to control the execution of code based on conditions is called a(n) __________.

    <p>if statement</p> Signup and view all the answers

    Match the following types of statements with their characteristics:

    <p>If statement = Executes block if condition is true If-else statement = Executes one block if condition is true and another if false Nested if statement = An if statement inside another if statement If-elif ladder = Used for checking multiple conditions sequentially</p> Signup and view all the answers

    What will happen if you forget to properly indent the code after an if statement?

    <p>It will raise an indentation error</p> Signup and view all the answers

    An if statement can have multiple else statements.

    <p>False</p> Signup and view all the answers

    Explain what a 'while loop' does in Python.

    <p>A while loop executes a block of code repeatedly as long as a specified condition is true.</p> Signup and view all the answers

    What happens to the else clause in a while loop if a break statement is executed?

    <p>The program skips the else clause.</p> Signup and view all the answers

    In Python, a for loop can have an else clause.

    <p>True</p> Signup and view all the answers

    Explain when the else clause of a while loop is executed.

    <p>The else clause of a while loop is executed when the condition becomes false, and the loop doesn't end due to a break statement.</p> Signup and view all the answers

    The syntax of a for loop begins with the keyword '____'.

    <p>for</p> Signup and view all the answers

    Match the type of loop to their primary characteristic:

    <p>While Loop = Repeatedly tests a condition For Loop = Iterates over a sequence For Else Loop = Executes if the loop is not terminated by a break While Else Loop = Executes if the condition becomes false</p> Signup and view all the answers

    What will be the output of the following code snippet?

    counter = 0
while counter < 3:
   print("Inside loop")
   counter = counter + 1
else:
   print("Inside else")

    <p>Inside loop Inside loop Inside loop Inside else</p> Signup and view all the answers

    The for loop can only iterate through lists in Python.

    <p>False</p> Signup and view all the answers

    What is the purpose of the statement 'sum = sum + val' in the for loop example?

    <p>It accumulates the total sum of the numbers in the list.</p> Signup and view all the answers

    What will be the output of the following code?

     i = 10
 if (i == 10):
     print("i is 10")
 elif (i == 15):
     print("i is 15")
 else:
     print("i is not present")

    <p>i is 10</p> Signup and view all the answers

    In a while loop, the body of the loop executes only when the test expression evaluates to True.

    <p>True</p> Signup and view all the answers

    What is the purpose of an 'elif' statement in an if-else ladder?

    <p>To check additional conditions after the initial if statement.</p> Signup and view all the answers

    The statement print("Hello TY") will execute _______ times if the count variable starts at 0 in the given while loop.

    <p>3</p> Signup and view all the answers

    Match the type of loop with its description:

    <p>While Loop = Repeats as long as the condition is true For Loop = Iterates over a sequence or collection Nested Loop = A loop inside another loop For Else = Executes a block when the loop finishes without a break</p> Signup and view all the answers

    Which statement will be executed when i = 20 in the following code?

     if (i == 10):
     print("i is 10")
 elif (i == 15):
     print("i is 15")
 elif (i == 20):
     print("i is 20")
 else:
     print("i is not present")

    <p>i is 20</p> Signup and view all the answers

    In an if-elif-else ladder, all conditions are evaluated even after one has been found to be true.

    <p>False</p> Signup and view all the answers

    What happens if none of the conditions in an if-elif-else ladder are met?

    <p>The else statement is executed.</p> Signup and view all the answers

    What is the output of the following function call: changeme([10, 20, 30]) in the first example?

    <p>Values outside the function: [10, 20, 50]</p> Signup and view all the answers

    In the function changeme(mylist), the line mylist = [1,2,3,4] changes the original list object passed to the function.

    <p>False</p> Signup and view all the answers

    What type of argument must match exactly in order with the function call?

    <p>Required arguments</p> Signup and view all the answers

    In Python, functions can be called with arguments preceded by a variable name followed by a '=' sign, known as ______.

    <p>Keyword arguments</p> Signup and view all the answers

    Which of the following is a characteristic of keyword arguments?

    <p>They can be provided in any order.</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Required Arguments = Must match exactly in order Keyword Arguments = Can be in any order based on a name Default Arguments = Used when a value is unspecified Variable-length Arguments = Allows passing a variable number of arguments</p> Signup and view all the answers

    The function printme() will execute without errors if called with no arguments.

    <p>False</p> Signup and view all the answers

    What happens when the function printme() is called without arguments?

    <p>TypeError: printme() takes exactly 1 argument (0 given)</p> Signup and view all the answers

    What type of variable can be accessed all over the program?

    <p>Global Variable</p> Signup and view all the answers

    Lambda functions can return multiple expressions.

    <p>False</p> Signup and view all the answers

    What is the syntax for defining a lambda function with two arguments?

    <p>lambda arg1, arg2: expression</p> Signup and view all the answers

    In Python, variables declared inside a function body are known as ______.

    <p>Local Variables</p> Signup and view all the answers

    What will be the output of the following code: sum = lambda arg1, arg2: arg1 + arg2; print(sum(5, 10))?

    <p>15</p> Signup and view all the answers

    A return statement without an expression will send back a value of zero.

    <p>False</p> Signup and view all the answers

    In the function definition def sum(arg1, arg2):, what is the purpose of 'arg1' and 'arg2'?

    <p>They are parameters of the function.</p> Signup and view all the answers

    Study Notes

    Python Programming - Unit II

    • This unit covers Python programming concepts, including flow control, loops, functions, and variable scope.

    Flow of Control

    • Decision-making is crucial for controlling program flow.
    • Python uses conditional statements (if, if-else, nested if-else, if-elif-else) to execute code blocks based on conditions.
    • Indentation is critical for defining code blocks within conditional statements (using whitespace, generally 4 spaces).

    Conditional Statements

    • if statement: Executes a block of code if a condition is true.
    if condition:
    # code to execute if condition is true
    • if-else statement: Executes one block if a condition is true, another if it's false.
    if condition:
    # code to execute if condition is true
else:
    # code to execute if condition is false
    • nested if: An if statement within another if statement.
    if condition1:
    if condition2:
        # code to execute if both conditions are true
    • if-elif-else ladder: A series of conditions, where the first true condition's block is executed and the rest are skipped.
    if condition1:
    # code to execute if condition1 is true
elif condition2:
    # code to execute if condition2 is true
else:
    # code to execute if neither condition is true

    Loops

    • while loop: Repeatedly executes a block of code as long as a condition is true.
    while condition:
    # code to execute while condition is true
    • for loop: Iterates over a sequence (like a list or string).
    for item in sequence:
    # code to execute for each item
    • Python's range() function is used to generate sequences of numbers in for loops.
    • for-else loop: The else block executes if the loop completes normally (without a break).
    for item in sequence:
    # code to execute for each item
else:
    # code to execute if the loop finishes without a break

    Break, Continue, and Pass Statements

    • break: Exits the loop prematurely, skipping the remaining iterations.
    • continue: Skips the remaining code in the current iteration and proceeds to the next.
    • pass: A null statement; does nothing (used as a placeholder).

    Functions

    • Functions organize code into reusable modules.
    • Syntax: 
    def function_name(parameters):
  """Docstring (optional): Describes function's purpose"""
  # Function body (code inside)
  return [expression]
    • Function call: Invokes a function.
    • Pass by reference: Modifying a list inside a function also alters the original list.
    • Return statement: Returns a value from a function (optional).
    • Types of Arguments:
      • Required arguments are mandatory and must have values supplied during a function call.
      • Keyword arguments are specified with variable name and values during the function.
      • Default arguments have a value specified during the definition.
      • Variable-length arguments accept any number of arguments.

    Scope of Variables

    • Local variables: Defined within a function and only accessible inside that function.
    • Global variables: Defined outside any function and accessible throughout the program.

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    Python Programming Constructs and Functions PDF

    Description

    This quiz covers the fundamentals of Python functions and conditional statements. It includes questions about the structure of function definitions, the purpose of return statements, and how if-else conditions work in Python programming. Test your knowledge and understanding of these essential programming concepts!

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