Functions

Question 1

what is a function ?

Answer 1

Functions are a convenient way to group our code into reusable blocks. A function contains a sequence of steps that can be performed repeatedly throughout a program without having to repeat the process of writing the same code again.

Question 2

what is the - def - keyword

Answer 2

The def keyword indicates the beginning of a function (also known as a function header). The function header is followed by a name in snake_case format that describes the task the function performs

Question 3

how to set up the start of a function

Answer 3

def function_name():

Question 4

what is calling a function

Answer 4

The process of executing the code inside the body of a function is known as calling it (This is also known as “executing a function”)

calling a function will print the print statements

Question 5

How do you call a function

Answer 5

To call our function, we must type out the function’s name followed by a pair of parentheses and no indentation:

function_name()

Question 6

How is indentation in functions important for execution flow

Answer 6

In Python, the amount of whitespace tells the computer what is part of a function and what is not part of that function.

Question 7

what are function paramaters

Answer 7

Function parameters allow our function to accept data as an input value. We list the parameters a function takes as input between the parentheses of a function ( ).

e.g

def my_function(single_parameter)

Question 8

what is a paramater and what does it do ?

Answer 8

A paramater is treated like a variable

def trip_welcome(destination):
print(“Welcome to Tripcademy!”)
print(“Looks like you’re going to “ + destination + “ today.”)

for the paramater we are telling it that it should expect some data to pass through

Question 9

what is an argument

Answer 9

The argument is the data that is passed in when we call the function, which is then assigned to the parameter name.

def trip_welcome(destination):
print(“Looks like you’re going to “ + destination + “ today.”)

trip_welcome(“Times Square”)

Question 9

how do we actually use a parameter?

Answer 9

def trip_welcome(destination):
print(“Welcome to Tripcademy!”)
print(“Looks like you’re going to “ + destination + “ today.”)

Our parameter of destination is used by passing in an argument to the function when we call it.

trip_welcome(“Times Square”)

Question 10

How to set mutiple paramaters

Answer 10

We can write a function that takes in more than one parameter by using commas:

def my_function(parameter1, parameter2, parameter3):

Question 11

How to set an argument with mutiple paramaters

Answer 11

my_function(argument1, argument2)

Question 12

what are Positional arguments

Answer 12

arguments that can be called by their position in the function definition.

Question 13

How do you set keyword arguments

Answer 13

where we explicitly refer to what each argument is assigned to in the function call.

example:

calculate_taxi_price(rate=0.5, discount=10, miles_to_travel=100)

Question 13

what are Keyword arguments

Answer 13

arguments that can be called by their name.

Question 13

what are Default arguments

Answer 13

arguments that are given default values.

Question 14

How do you set Default arguments

Answer 14

want to give our function parameters default values. We can provide a default value to a parameter by using the assignment operator (=).
This will happen in the function declaration rather than the function call.

example: default value will be 10

def calculate_taxi_price(miles_to_travel, rate, discount = 10):

calculate_taxi_price(10, 0.5)

Question 15

What are user defined functions

Answer 15

User Defined Functions - functions that are written by users (like us!).

Question 16

What are built in functions

Answer 16

functions that come built into Python for us to use

Question 17

What does help() function do

Answer 17

will print a link to documentation for us and provide some details

Question 17

What does the len() built in function do

Answer 17

To get the length of a string

length_of_destination = len(destination_name)

Question 18

what does the max() and min() function do

Answer 18

max = Return the largest item in an iterable or the largest of two or more arguments.

min = returns the smallest value in a varible

Question 19

what does the round() function do

Answer 19

values are rounded to the closest multiple of 10 to the power minus ndigits

Question 20

How to set the scope of a variable inside and outside of a function

Answer 20

This function will print the favorite locations

favorite_locations = “Paris, Norway, Iceland”

def print_count_locations():
print(“There are 3 locations”)

def show_favorite_locations():
print(“Your favorite locations are: “ + favorite_locations)

print_count_locations()
show_favorite_locations()

Question 21

what does the return keyword do

Answer 21

Functions can also return a value to the program so that this value can be modified or used later

allows us to reuse the value (in the form of a variable) throughout the rest of the program.

Question 22

How to you return mutiple values

Answer 22

weather_data = [‘Sunny’, ‘Sunny’, ‘Cloudy’, ‘Raining’, ‘Snowing’]

def threeday_weather_report(weather):
first_day = “ Tomorrow the weather will be “ + weather[0]
second_day = “ The following day it will be “ + weather[1]
third_day = “ Two days from now it will be “ + weather[2]
return first_day, second_day, third_day

This function takes in a set of data in the form of a list for the upcoming week’s weather. We can get our returned function values by assigning them to variables when we call the function:

monday, tuesday, wednesday = threeday_weather_report(weather_data)

print(monday)
print(tuesday)
print(wednesday)