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Questions and Answers
What happens when an immutable data type is passed to a function and an attempt is made to modify its value inside the function?
What happens when an immutable data type is passed to a function and an attempt is made to modify its value inside the function?
- The original object is modified directly.
- The modification is applied to the original object outside the function.
- The function will throw an error immediately.
- A new object is created in the local function scope. (correct)
What type of error occurs when a function is called with an argument that has a type different from what is expected?
What type of error occurs when a function is called with an argument that has a type different from what is expected?
- ValueError
- TypeError (correct)
- SyntaxError
- IndexError
What specific condition results in a TypeError during runtime when dealing with function calls?
What specific condition results in a TypeError during runtime when dealing with function calls?
- The function arguments are missing.
- The function called is not defined.
- The returned value's type does not match the expected type. (correct)
- The function call syntax is incorrect.
Which Python library function requires importing the 'math' module?
Which Python library function requires importing the 'math' module?
What must be done to use the randint() function in a Python program?
What must be done to use the randint() function in a Python program?
What is the main purpose of using functions in programming?
What is the main purpose of using functions in programming?
What must be done before calling a function in a program?
What must be done before calling a function in a program?
In the function definition def area(length_, width_):, what do length_ and width_ represent?
In the function definition def area(length_, width_):, what do length_ and width_ represent?
What must the data types of call arguments match?
What must the data types of call arguments match?
In the context of the function call, what does the argument-list represent?
In the context of the function call, what does the argument-list represent?
Which statement regarding fruitful and void functions is correct?
Which statement regarding fruitful and void functions is correct?
What kind of error might occur if the function arguments are not compatible with the parameter types?
What kind of error might occur if the function arguments are not compatible with the parameter types?
Which of the following statements about functions is false?
Which of the following statements about functions is false?
What happens when the variable count is passed as an argument to a function that modifies its parameter?
What happens when the variable count is passed as an argument to a function that modifies its parameter?
What is the significance of function parameters in argument passing?
What is the significance of function parameters in argument passing?
In the example provided, what happens when area(lnA, wdA) is executed?
In the example provided, what happens when area(lnA, wdA) is executed?
Which Python built-in function is utilized to convert data types?
Which Python built-in function is utilized to convert data types?
In which scenario would a function be considered void?
In which scenario would a function be considered void?
What does the return value of a function represent?
What does the return value of a function represent?
Which of the following statements best describes the assignment relationship between arguments and parameters?
Which of the following statements best describes the assignment relationship between arguments and parameters?
What is the primary difference between a function's return value and its parameters?
What is the primary difference between a function's return value and its parameters?
What happens to a local variable defined inside a function when the function ends?
What happens to a local variable defined inside a function when the function ends?
Which of the following statements is true regarding mutable data types in functions?
Which of the following statements is true regarding mutable data types in functions?
What occurs when you reassign a variable to a new object within a function?
What occurs when you reassign a variable to a new object within a function?
In the context of variable behavior, which of the following is true about integers and floats?
In the context of variable behavior, which of the following is true about integers and floats?
What does it mean that lists are mutable in Python?
What does it mean that lists are mutable in Python?
When a variable is defined as local inside a function, which statement is correct?
When a variable is defined as local inside a function, which statement is correct?
If a list is modified by directly changing its elements inside a function, what will happen to the list outside the function?
If a list is modified by directly changing its elements inside a function, what will happen to the list outside the function?
What is the overarching rule for argument passing in Python regarding mutable and immutable types?
What is the overarching rule for argument passing in Python regarding mutable and immutable types?
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Study Notes
Functions
- Functions are reusable blocks of code that perform specific tasks.
- They improve program clarity and maintainability.
- Functions are defined only once but can be invoked multiple times.
- Similar to built-in functions like input(), int(), float(), and print().
Function Definition
- def function-name(parameter-list): Defines the function.
- code-block: Contains instructions to execute.
- return-statement: Returns a value to the caller.
Function Call
- Returned-value-holder = function-name(argument-list) Invokes the function.
- argument-list: Values passed to the function's parameters.
- returned-value-holder: Stores the value returned by the function.
Argument Passing
- Pass by value: A copy of the argument's value is passed to the function.
- Changes made to the parameter inside the function do not affect the original argument.
- Pass by reference: A reference (memory address) to the argument is passed.
- Changes made to the object inside the function will affect the original argument.
Function - Local Variables
- Variables declared inside a function are local.
- They are only accessible within the function.
- Changes to local variables do not affect variables outside the function.
Data Types and Argument Passing
- Mutable Data Types: Lists, dictionaries, sets.
- Changes within a function directly impact the original object.
- Immutable Data Types: Integers, floats, strings, tuples.
- Attempts to change the value within a function create a new object, leaving the original unchanged.
Type Error
- Occurs when the type of argument passed to a function does not match the expected type.
- Also occurs if the returned value of a function has an unexpected type.
Library Functions
- Python has extensive libraries with predefined functions.
- Import necessary modules to use those functions.
- import math (contains factorial())
- import random (contains randint())
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