Programming Functions Basics

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Questions and Answers

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

  • To declare a variable
  • To convert a string to an integer
  • To output strings to users
  • To take input from the user (correct)

What is the data type of the user's response to the prompt in the input() function?

  • String (correct)
  • Boolean
  • Integer
  • Float

What is the purpose of the int() function in the code x = int(xString)?

  • To output a string to the user
  • To convert a string to an integer (correct)
  • To declare a variable
  • To convert an integer to a string

What is the syntax to call a function in Python?

<p>function(1, 2) (D)</p> Signup and view all the answers

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

<p>To output strings to users (D)</p> Signup and view all the answers

What is E notation used for in Python?

<p>To represent very large numbers (C)</p> Signup and view all the answers

What is the benefit of using parentheses in Python code?

<p>It makes the code more explicit (D)</p> Signup and view all the answers

What is the purpose of assigning a function call to a variable?

<p>To store the returned value of a function (B)</p> Signup and view all the answers

What is the purpose of the assignment operator (=) in variable assignment?

<p>To set the variable name equal to the memory location where the value is found (C)</p> Signup and view all the answers

What is the convention for naming variables in camel case?

<p>The first word is in lowercase and subsequent words are capitalized (B)</p> Signup and view all the answers

What is the purpose of a function in programming?

<p>To perform a specific action or set of actions (C)</p> Signup and view all the answers

What is the syntax to define a function in programming?

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

What is the data type of the value 7.0?

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

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

<p>To return a value from the function to the original call (D)</p> Signup and view all the answers

What is the data type of the value true?

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

What is the purpose of parameters in a function?

<p>To pass values or variables to be used within the function (D)</p> Signup and view all the answers

What is the purpose of indentation in Python?

<p>To indicate blocks of code, making it simpler and more readable (D)</p> Signup and view all the answers

What is a function in Python?

<p>A block of code that can be executed multiple times (C)</p> Signup and view all the answers

How do you declare a function in Python?

<p>Using the 'def' keyword (C)</p> Signup and view all the answers

What is the purpose of the 'main' code in Python?

<p>To call functions and execute the program (C)</p> Signup and view all the answers

What is a variable in Python?

<p>A reference to a value stored in a computer's memory (C)</p> Signup and view all the answers

What is an object in Python?

<p>A collection of data from a computer's memory that can be manipulated (C)</p> Signup and view all the answers

What is the output of the code 'print("Hello, world!")'?

<p>Hello, world! (D)</p> Signup and view all the answers

What is the purpose of the 'print' function in Python?

<p>To output data to the console (C)</p> Signup and view all the answers

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Study Notes

Basic Syntax Rules

  • In Python, function calls are made by referring to the function name followed by parentheses containing necessary arguments, separated by commas.
  • The value returned by the function can be assigned to a variable.

Data Types and Operators

  • A data type determines the type of value and the operations that can be performed on it.
  • All objects have a data type.
  • Operators are symbols used to perform specific functions or computations.
  • Input functions (input()) allow users to input values into the program, with a prompt as a string.
  • The user's response is returned as a string and can be converted to another data type using functions like int().
  • Print functions (print()) output strings to users and can take any type as a parameter, automatically converting it to a string.

Understanding Mutable and Immutable Data Types in Python

  • The three ways to create integer literals are similar to techniques for creating float literals.
  • E notation is used to create a float literal, similar to exponential notation used by calculators.

Functions

  • A function is equivalent to a static method in Java.
  • Functions have a syntax definition (def name():) and must be declared above the 'main' code.
  • Statements inside the function must be indented.
  • A function can be called multiple times from the main code.

Whitespace Significance

  • Python uses indentation to indicate blocks, making the code simpler and more readable.
  • In Python, indenting is required, unlike Java where it is optional.

Variables

  • A variable is a reference to a value stored in a computer's memory.
  • Variables can be categorized into data types such as numbers, Boolean values, and sequences.
  • All variables are objects, although some objects can be defined by multiple variables.
  • Methods are functions used to act on or alter an object's data.

Basic Syntax Rules (continued)

  • Variable names are typically in camel case, with the first word starting with a lowercase letter and subsequent words capitalized.
  • Variable names can also be in snake case, with all words in lowercase and underscores between words.
  • The assignment operator (=) sets the variable name equal to the memory location of the value.
  • The type of the value does not need to be stated, but its format must abide by a given object type.

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