Lesson 10

Question 1

Libraries/modules

Answer 1

A python module is a reusable collection of functions, variables, and code that can be imported into a program to extend its functionality
Modules provide a structured and efficient way to share reusable code with others

Question 2

Why are modules good

Answer 2

Maintainability: updates and improvements can be made to a module without modifying the main program.
Modularity: Enabling independent development and debugging of different parts of a program

Question 3

Creating a module:

Answer 3

Write function definitions and variables in a file and save it with the *.py extension

Question 4

Using a module

Answer 4

There are multiple ways to import a module to gain access to the functions/variables within it.

Question 5

Importing a module

Answer 5

Import list_processor
import list_processor as lp #alias
from list_processor import sum_all, LIST_OF_ZERO #specific functions/ variables

Question 6

Importing multiple modules:

Answer 6

in case there are name conflicts with functions/variables imported from multiple modules you should rename them at the time of import

Question 7

Changing names at import

Answer 7

from another_module import sum_all as sum_all2

Question 8

Circular imports

Answer 8

When two modules depend on each other

Question 9

Running a script bs importing a script:

Answer 9

Any *.py file is considered a script but some are intended ti be modules and other programs.

Question 10

Every python script has a special built in variable called:

Answer 10

__name__

Question 11

When a script runs directly, __name__ is set to

Answer 11

“__main__”

Question 12

When a script is imported as a module, __name__

Answer 12

is set to the modules filename

Question 13

To promote reusability in scripts

Answer 13

it is best practice to separate script logic and library code.

Question 14

Built in modules:

Answer 14

these come pre installed with python and can be directly imported using the methods introduced

Question 15

Common built in modules

Answer 15

math- extends the list of mathematical functions
sys- provides access to system specific parameters and functions, allowing interaction with the python runtime environment (sys.argv, e.g.)
os-interact with the operating system (manage files and folders, e.g)
random: make random numbers
datetime: create dates

Question 16

External modules: these have to be installed

Answer 16

• In a terminal window, type ‘pip install <module>’
  Typically pip is pre installed when Python is installed. If it is not, use Google/chatGPT to help you install pip</module>

Question 17

numpy

Answer 17

Used for working with arrays/matrices

Question 18

Matplot lib

Answer 18

used for plotting data

Question 19

Sklearn

Answer 19

machine learning