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Questions and Answers
What is the primary purpose of functions in programming?
What is the primary purpose of functions in programming?
- To reduce the number of lines of code in a program.
- To allow direct access to memory locations.
- To improve program performance by executing faster.
- To encapsulate instructions for better clarity and maintainability. (correct)
How must a function be defined before it is called?
How must a function be defined before it is called?
- It must be defined in the same file as the main program.
- It must be associated with multiple libraries.
- It must be documented thoroughly in comments.
- It must be defined prior to the call in code. (correct)
Which of the following best describes a function's return statement?
Which of the following best describes a function's return statement?
- It allows the function to accept additional parameters.
- It terminates the program entirely when executed.
- It is optional and can only be used once in a function.
- It provides a value back to the caller after execution. (correct)
What should you pass as arguments when calling the function 'area'?
What should you pass as arguments when calling the function 'area'?
What is a common mistake related to function calls?
What is a common mistake related to function calls?
In the context of functions, what is meant by 'argument passing'?
In the context of functions, what is meant by 'argument passing'?
Which is NOT a characteristic of functions?
Which is NOT a characteristic of functions?
What will happen if you try to call a function named 'computeArea' that has not been defined?
What will happen if you try to call a function named 'computeArea' that has not been defined?
Which of the following statements accurately describes a fruitful function?
Which of the following statements accurately describes a fruitful function?
What happens when a variable is passed by value to a function?
What happens when a variable is passed by value to a function?
Which of the following is true regarding the argument 'count' and the function parameter 'count'?
Which of the following is true regarding the argument 'count' and the function parameter 'count'?
What is the expected data type of the argument 'lnA' if the function parameter 'length_' is defined as a float?
What is the expected data type of the argument 'lnA' if the function parameter 'length_' is defined as a float?
What is the outcome of calling a void function?
What is the outcome of calling a void function?
What aspect of argument passing allows for the variable 'n' to change without impacting 'count' during its function call?
What aspect of argument passing allows for the variable 'n' to change without impacting 'count' during its function call?
Why is it important for call arguments to match the data types of function parameters?
Why is it important for call arguments to match the data types of function parameters?
Which of the following is a characteristic of void functions?
Which of the following is a characteristic of void functions?
What happens to the variable n when it is defined inside a function?
What happens to the variable n when it is defined inside a function?
When you assign x = 20 inside the myFun function, what happens to the original list lst?
When you assign x = 20 inside the myFun function, what happens to the original list lst?
How are mutable objects affected when passed to a function?
How are mutable objects affected when passed to a function?
What is the effect of reassigning a variable that points to an immutable object inside a function?
What is the effect of reassigning a variable that points to an immutable object inside a function?
Which of the following types is considered immutable?
Which of the following types is considered immutable?
What is the main reason mutable objects can be changed within a function?
What is the main reason mutable objects can be changed within a function?
What will happen if a variable defined outside a function is referred to by a local variable inside the function?
What will happen if a variable defined outside a function is referred to by a local variable inside the function?
What happens when you attempt to change the value of an immutable data type within a function?
What happens when you attempt to change the value of an immutable data type within a function?
When a list is passed to a function, what determines whether the list is modified within that function?
When a list is passed to a function, what determines whether the list is modified within that function?
What type of error occurs when a function is called with arguments that do not match the expected types?
What type of error occurs when a function is called with arguments that do not match the expected types?
Which statement is true regarding using library functions in Python?
Which statement is true regarding using library functions in Python?
If a function returns a value that does not match the expected type in an expression, what type of error is generated?
If a function returns a value that does not match the expected type in an expression, what type of error is generated?
Which of the following import statements is correctly associated with the appropriate functions?
Which of the following import statements is correctly associated with the appropriate functions?
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Study Notes
Functions
- Functions group a set of instructions to perform a specific task
- Functions improve code clarity and maintainability
- They are defined once but can be used multiple times
- Examples of built-in functions are:
input(),int(),float(), andprint()
Function Definition and Call
- Function definition syntax:
def function-name(parameter-list): code-block return-statement - Function call syntax:
returned-value-holder = function-name(argument-list) - Function call matches arguments to parameters by order
- Argument data types must match function parameter data types
- Returned value data type is defined within the function definition
Fruitful vs Void Functions
- Fruitful functions return a value
- Void functions don't return any value
- Example:
Area()function calculates the area of a rectangle and is fruitful.
Argument Passing
- Arguments passed by value create a copy of the variable within the function
- Changes in the function do not affect the original variable
- Local variables defined within functions are only accessible inside the function
- Mutable data types like lists, dictionaries, and sets can be modified within a function, impacting the original object
- Immutable data types like integers, floats, strings, and tuples cannot be directly modified inside a function
- Changing an immutable data type creates a new object in the function's local scope
Type Error
- A
TypeErroroccurs when arguments passed to a function have the wrong data type - A
TypeErroralso occurs when the returned value of a function call has a different data type than expected
Using Library Functions
importstatements are used to access functions from external libraries- Example:
import mathfor thefactorial()function;import randomfor therandint()function factorial()calculates the factorial of a numberrandint(a, b)generates a random integer betweenaandb
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