Intro to Abstraction

Question 1

How to print current time in Python?

Answer 1

Import time module and run time.ctime() function:
import time
print ("This program started on  "+time.ctime())

Question 2

How to open a web browser in a Python program?

Answer 2

Import a webbrowser module and run webrowser.open (:httm://…”) function

Question 3

How to suspend a program in Python?

Answer 3

Import a time module and run time.sleep(X) function. X - is any number in seconds - time for which you want to suspend the program.

Question 4

How to stop a running program running from idle?

Answer 4

Press Crtl +C in a shell of running program

Question 5

How Wiki defines Abstraction in programming?

Answer 5

In computer science, abstraction is a technique for managing complexity of computer systems. It works by establishing a level of complexity on which a person interacts with the system, suppressing the more complex details below the current level.

Question 6

which module in Python allow to work with the operating system?

Answer 6

import os

Question 7

how to list files in a certain directory in Python?

Answer 7

import os

os.listdir(r”path”)

Question 8

how to display current directory?

Answer 8

import os

os.getcwd()

Question 9

how to change working directory?

Answer 9

import os

os.chdir(r”path”)

Question 10

how to “translate” a string?

Answer 10

string.translate(table, list of characters to be removed),
where “table” translates one set of characters into another set of characters. In not necessary, have “None” there. the second argument removes specified characters from the string.

Question 11

how to rename a file?

Answer 11

import os

os.rename(old name, new name)

Question 12

what is an example of a module that allows draw graphics?

Answer 12

import turtle

Question 13

what would this code do:
import turtle
brad=turtle.Turtle

Answer 13

it would import a module turtle, then create an instance of a class Turtle (note the upper case), named brad

Question 14

what is the essence of a class in Python?

Answer 14

a class is like a blueprint of a building that will allow build different buildings (but also similar) based on this blueprint