Functions

Question 1

A function

Answer 1

A block of code that is only executed when it is called

Question 2

Write the function to print Hello World!:
The functions name should be “start”

Answer 2

Def start():
Print(“Hello World!”)

Question 3

What are arguments?

Answer 3

Information you send to a function

Question 4

Return statement

Answer 4

Functions send Python values/ objects to the caller. These values/objects are known as the functions return value.

Question 5

Keyword arguments

Answer 5

Arguments preceded by an identifier when we pass them to a function, the order of the arguments doesn’t matter, unlike positional arguments, Python knows the names of the arguments that our function receives.

Question 6

Write a function with key word arguments for Alexander cardoza

The function looks like this

Def name(First,Last):
First +” “ + Last

Answer 6

name(“alexander”=First, “cardoza” = Last)

Output:
alexander Cardoza

Question 7

Nested function calls

Answer 7

Function calls inside other function calls, innermost function calls are resolved first and the returned value is used as an argument for the next outer function

Question 8

In the nested function
Print(Round(Abs(Float(Input(“enter number”)))))

What would happen if you inserted the number -6.9

Answer 8

The number 7 would be printed

Question 9

Scope

Answer 9

The region that a variable is recognised
A variable is only available from the region it is created
global and locally scoped versions of a variable can be created.

Question 10

Local scope

Answer 10

Available only in the function that it was created in

Question 11

Global scope

Answer 11

Available inside and outside of functions as it was created outside of a function

Question 12

L
E
G
B

Answer 12

Local
Enclosing
Global
Built-in

Question 13

Kwargs

Answer 13

Parameter that will pick all arguments into a dictionary
-useful so that a function can accept a varying amount of keyword arguments

Question 14

How do you use kwargs?

Answer 14

In the brackets of your function write “**variable” (variable can be anything)

And in the function’s block of code , where you want to insert the variable write the name of your variable and then use the square brackets [] to define which variable you would like to use e.g

Def printName(**kwargs):
Print(“Hello “ +kwargs[name]

printName(name= ‘alex’)

Question 15

Key,value

Answer 15

The key has children: (the value)

Question 16

End = “ “

Answer 16

This is usually used in print statements, it makes the end of a print statement a space as an oppose to a new line so each print iteration stays on the same line.

Question 17

What is implementation?

Answer 17

The defined function’s “function” or process

Question 18

Assigning a function to a variable

Answer 18

Def Hello()
Print(“what’s up”)
Hi = Hello

Hi()

Output:
“What’s up”

Question 19

Higher order functions

Answer 19

A function that either:
Accepts a function as an argument
Or
Returns a function
(In Python functions are also treated as objects)

Question 20

Lambada function

Answer 20

Function written in 1 line using lambda keyword
-accepts any number of arguments, but only has one expression.
(Useful if needed for a short period of time, throw away)

Question 21

Write a lambda function called double that multiplies an argument by 2

Answer 21

double = lambda x:x *2

Question 22

In a lambda function where do you input the parameters?

Answer 22

Before the colon
E.g(x,y)

Lambda x,y:

Question 23

How would you print your lambda function?

Answer 23

Print(name(argument))

Question 24

How can you use the lambda function as an argument / key

Answer 24

Per say I wanted to use a function to define the key at a specific index for another function

I could write

GetIndex = lambda data: data[1]

Question 25

How can you exit a function?

Answer 25

Use Return

Question 26

Use a recursive for walking 100 steps

Answer 26

Recursives re use functions

Def walk(amount):
Print(f”you have walked {amount}
steps”)
If steps == 0
Return
walk(amount-1)

Question 27

Iterative version of walk(100)

Answer 27

Def walk(amount)
For steps in range(amount+1):
Print(f”you have walked {steps}
steps)