Part 4, Organising your python code and data

Question 1

what are the steps in defining a function

Answer 1

this involves

1. creating the header
   1a. the function name
   1b. the functions parameters
2. create the body, which holds the code the function will execute

Question 2

what does the python help() function do

Answer 2

this will retrive the header of the function you put in as an argument and also retrive any docstrings held by that function

Question 3

this is an object (such as an integer or string) that is unchanging and will always stand for itself.

NOTE: A variable is not a literal as it can change value and type at any time

Answer 3

what is a literal

Question 4

to use these

1. place a string surrounded by three quotation marks on each side as the first line of any functions or classes

Answer 4

how do you use docstrings in python

Question 5

this is an expression constructed using basic expressions

Answer 5

what are constructed expressions

Question 6

1. The right hand side of the assignment is evaluated and an object is created for the expression
2. The python interpreter checks to see if any other object is using the same named label
3. If the label is not in use then the new label is created and attached to the object

Otherwise

1. This label is removed from the object its currently attached to
2. The label is then attached to the object that was created in step one

Answer 6

what is the process that python follows when assighning variables

Question 7

this keyword can be used for debugging and testing purposes

Answer 7

what is the python assert keyword used for

Question 8

how do you use docstrings in python

Answer 8

to use these

1. place a string surrounded by three quotation marks on each side as the first line of any functions or classes

Question 9

when writing a test function what should be included in the name of the function

Answer 9

1. What the function does (a verb such as test)
2. What it does it to (such as the function name you are testing)

Question 10

this is made up of

1. Its id
2. Its type
3. Its value

Answer 10

what three parts is a python object made up of

Question 11

When the python interpreter reads through the code it will evaluate expressions and data items into objects. These objects are held inside the python interpreters memory

Answer 11

what does the python interpreter do to all data items when reading through the code

Question 12

name 3 examples of constructed expressions and what they are constructed from

Answer 12

1. Lists - constructed using literals
2. Arithmetic operators - constructed using literals
3. Function expressions - constructed using a function name and arguments

Question 13

This can be used to find the type of an object

Answer 13

what is the python type() function used for

Question 14

this will retrive the header of the function you put in as an argument and also retrive any docstrings held by that function

Answer 14

what does the python help() function do

Question 15

what is text-driven development

Answer 15

This is the idea of writing tests before you write the code. The idea behind this is that it gives you a clearer understanding of what the code should do

Question 16

1. What the function does (a verb such as test)
2. What it does it to (such as the function name you are testing)

Answer 16

when writing a test function what should be included in the name of the function

Question 17

to use a function what 4 things should you know beforehand

Answer 17

1. The name of the function
2. What kind of arguments it needs
3. What it gives back as a return value
4. What other effects calling the function has (such as printing to console)

Question 18

how does the python assert keyword work

Answer 18

this works by creating an assert statement which consists of

1. the assert keyword
2. a boolean expression

When the boolean expression evaluates to true nothing happens and the program continues running. However if the boolean expression evaluates to false then the program is halted and an assertion error error message is displayed

Question 19

1. Lists - constructed using literals
2. Arithmetic operators - constructed using literals
3. Function expressions - constructed using a function name and arguments

Answer 19

name 3 examples of constructed expressions and what they are constructed from

Question 20

what is the python assert keyword used for

Answer 20

this keyword can be used for debugging and testing purposes

Question 21

This can be used to find the id of an object

Answer 21

what is the python id() function used for

Question 22

this is the parts that you know about, including

1. name
2. arguments
3. return values
4. any other effects/actions

Answer 22

explain the concept of a function interface

Question 23

what are these known as

1. variables

2. literals

Answer 23

name 2 objects that are considered basic expressions

Question 24

explain the concept of the function implementation

Answer 24

This is everything that goes on under the bonnet, it is not important to know what happens here just that you understand the interface

Question 25

these are known as containers and the value of a container will consist of zero or more references or labels. Each reference or label is then attached to an element of the list such as a string or integer

Answer 25

what are lists in python known as and what will a list contain as it values

Question 26

what is a **literal**

Answer 26

this is an object (such as an integer or string) that is unchanging and will always stand for itself. NOTE: A variable is not a literal as it can change value and type at any time

Question 27

1. The name of the function 2. What kind of arguments it needs 3. What it gives back as a return value 4. What other effects calling the function has (such as printing to console)

Answer 27

to use a function what 4 things should you know beforehand

Question 28

what is the **python type() function** used for

Answer 28

This can be used to find the type of an object

Question 29

this is a way that python helps you to document your code

Answer 29

what is a docstring in python

Question 30

explain the concept of a **function interface**

Answer 30

this is the parts that you know about, including 1. name 2. arguments 3. return values 4. any other effects/actions

Question 31

what are lists in python known as and what will a list contain as it values

Answer 31

these are known as containers and the value of a container will consist of zero or more references or labels. Each reference or label is then attached to an element of the list such as a string or integer

Question 32

what is a docstring in python

Answer 32

this is a way that python helps you to document your code

Question 33

what three parts is a **python object** made up of

Answer 33

this is made up of 1. Its id 2. Its type 3. Its value

Question 34

when using a **function** what are its three parts

Answer 34

this is made up off 1. a name 2. any arguments 3. expression (the combination of the name and any arguments)

Question 35

what does the python interpreter do to all data items when reading through the code

Answer 35

When the python interpreter reads through the code it will evaluate expressions and data items into objects. These objects are held inside the python interpreters memory

Question 36

in python what are data items such as strings or integers known as

Answer 36

these are known as objects

Question 37

this is made up off 1. a name 2. any arguments 3. expression (the combination of the name and any arguments)

Answer 37

when using a **function** what are its three parts

Question 38

name 2 objects that are considered **basic expressions**

Answer 38

what are these known as ## Footnote **1. variables** **2. literals**

Question 39

what is the **python id() function** used for

Answer 39

This can be used to find the id of an object

Question 40

what are **constructed expressions**

Answer 40

this is an expression constructed using basic expressions

Question 41

these are known as objects

Answer 41

in python what are data items such as strings or integers known as

Question 42

this works by creating an assert statement which consists of 1. the assert keyword 2. a boolean expression When the boolean expression evaluates to true nothing happens and the program continues running. However if the boolean expression evaluates to false then the program is halted and an assertion error error message is displayed

Answer 42

how does the python **assert** keyword work

Question 43

what is the process that python follows when assighning variables

Answer 43

1. The right hand side of the assignment is evaluated and an object is created for the expression 2. The python interpreter checks to see if any other object is using the same named label 3. If the label is not in use then the new label is created and attached to the object Otherwise 1. This label is removed from the object its currently attached to 2. The label is then attached to the object that was created in step one

Question 44

This is everything that goes on under the bonnet, it is not important to know what happens here just that you understand the interface

Answer 44

explain the concept of the **function implementation**

Question 45

this involves ## Footnote 1. creating the header 1a. the function name 1b. the functions parameters 2. create the body, which holds the code the function will execute

Answer 45

what are the steps in **defining a function**

Question 46

This is the idea of writing tests before you write the code. The idea behind this is that it gives you a clearer understanding of what the code should do

Answer 46

what is **text-driven development**