Python Functions
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Questions and Answers

What is the purpose of the def keyword in Python?

  • To import a module
  • To declare a variable
  • To define a function (correct)
  • To raise an exception

    • How are functions called in Python?

  • Using the function name followed by parentheses (correct)
  • Using the `call` function
  • Using the `eval` function
  • Using the `exec` function

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

  • To raise an exception
  • To exit a function and return a value (correct)
  • To import a module
  • To exit a loop

    • What is a lambda function?

    <p>A small, anonymous function defined inline</p> Signup and view all the answers

    What happens if a variable is defined inside a function?

    <p>It is local to the function and cannot be accessed outside</p> Signup and view all the answers

    How can you pass a variable number of arguments to a function?

    <p>Using the <code>*</code> operator</p> Signup and view all the answers

    What is the purpose of the global keyword in a function?

    <p>To modify a global variable</p> Signup and view all the answers

    How can you pass keyword arguments to a function?

    <p>Using the <code>**</code> operator</p> Signup and view all the answers

    What is the default return value of a function if no value is specified?

    <p>None</p> Signup and view all the answers

    How can you assign a default value to a function parameter?

    <p>Using the <code>=</code> operator</p> Signup and view all the answers

    Study Notes

    Functions

    Defining a Function

    • A function is a block of code that can be executed multiple times from different parts of a program
    • Functions are defined using the def keyword followed by the function name and parameters in parentheses
    • The function body is indented below the definition

    Function Syntax

    • def function_name(parameters):
    • # function body

    Function Parameters

    • Parameters are values passed to a function when it's called
    • Parameters can be assigned default values using the = operator
    • def greet(name = 'World'): print('Hello, ' + name + '!')

    Function Return

    • The return statement is used to exit a function and return a value
    • If no value is specified, the function returns None
    • def add(a, b): return a + b

    Function Calls

    • Functions are called by using the function name followed by parentheses containing the arguments
    • greet('John') or result = add(2, 3)

    Lambda Functions

    • Lambda functions are small, anonymous functions that can be defined inline
    • lambda keyword is used to define a lambda function
    • add = lambda a, b: a + b

    Function Scope

    • Variables defined inside a function are local to that function and cannot be accessed outside
    • Global variables can be accessed inside a function, but it's not recommended to modify them
    • global keyword can be used to modify a global variable inside a function

    Function Arguments

    • Arguments can be passed to a function in three ways:
      • Positional arguments: func(a, b, c)
      • Keyword arguments: func(a=1, b=2, c=3)
      • Default arguments: func(a, b, c=3)

    Variable Number of Arguments

    • The * operator can be used to pass a variable number of arguments to a function
    • The ** operator can be used to pass a variable number of keyword arguments to a function
    • def func(*args, **kwargs):

    Functions

    Defining a Function

    • A function is a reusable block of code that can be executed multiple times from different parts of a program.
    • The def keyword is used to define a function, followed by the function name and parameters in parentheses.
    • The function body is indented below the definition.

    Function Syntax

    • The basic syntax for a function is def function_name(parameters): followed by the function body.
    • The function body is indented below the definition.

    Function Parameters

    • Parameters are values passed to a function when it's called, and can be assigned default values using the = operator.
    • Parameters can be assigned default values, which are used if no value is provided when the function is called.

    Function Return

    • The return statement is used to exit a function and return a value to the caller.
    • If no value is specified, the function returns None by default.

    Function Calls

    • Functions are called by using the function name followed by parentheses containing the arguments.
    • Arguments can be passed to a function in different ways, including positional, keyword, and default arguments.

    Lambda Functions

    • Lambda functions are small, anonymous functions that can be defined inline using the lambda keyword.
    • Lambda functions are used to define small, one-time-use functions.

    Function Scope

    • Variables defined inside a function are local to that function and cannot be accessed outside.
    • Global variables can be accessed inside a function, but it's not recommended to modify them.
    • The global keyword can be used to modify a global variable inside a function.

    Function Arguments

    • Arguments can be passed to a function in three ways:
      • Positional arguments: func(a, b, c)
      • Keyword arguments: func(a=1, b=2, c=3)
      • Default arguments: func(a, b, c=3)

    Variable Number of Arguments

    • The * operator can be used to pass a variable number of arguments to a function.
    • The ** operator can be used to pass a variable number of keyword arguments to a function.
    • The *args and **kwargs syntax can be used to pass a variable number of arguments and keyword arguments to a function.

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    Description

    This quiz covers the basics of defining and using functions in Python. Learn about function syntax, parameters, and more.

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