Official Cert Guide - Chapter 4 - 5

Question 1

Question

Answer 1

Answer

Question 2

What is a python function?

Answer 2

A named block of code that can take wide variety parameters and return some form of output back.

Question 3

Can you reuse a function?

Answer 3

Yes

Question 4

Where stands OOPS for?

Answer 4

Object Oriented Programming

Question 5

As what kind of modern language was Python Developed?

Answer 5

Object Oriented Programming

Question 6

What is Object Oriented Programming?

Answer 6

A computer programming paradigm that makes it possible to describe real-world things and their relationships to each other.

Question 7

What does OOP do?

Answer 7

You can create an object with several variables anywhere in your code and call this OOP function when you want.

Question 8

What is Python in relation with OOP?

Answer 8

Object are central in Python. Python is jus a collection of objects interacting with each other.

Question 9

What is the idea of OOP?

Answer 9

Break up a program into smaller

Question 10

What is an important part of the OOP principles of reusability and object oriented structure?

Answer 10

Functions!

Question 11

How do you describe objects in Python

Answer 11

With Classes!

Question 12

What are classes?

Answer 12

A class is a tool you use to ceate your own data structure that contains information about something.

Question 13

How do you use classes

Answer 13

You can use functions(methods) to perform operations on the data you describe

Question 14

When you start with a class what is the first thing to do?

Answer 14

You need to pass some values to get started. The first values is always: self

Question 15

What happens with the self value?

Answer 15

The self value passes the object name that you select to instantiate the class.

Question 16

You can start the fucntion with init. How do we call this?

Answer 16

dunder or magic methods. This will setup the class.

Question 17

The attributes you add to the class how are these called and what are they doing?

Answer 17

Called method. This become actions that you can perform on the object you are creating.

Question 18

What is recommanded to do when you are creating a class

Answer 18

Provide other capitalizing signs from a variable. Example: use ‘'’test’’’ for a class and ‘‘test’’ for a variable

Question 19

What do you replace when you use inheritance

Answer 19

You can replace methods and attributes that need to be different

Question 20

What is important when you inherit in a class

Answer 20

You create the class before the colon

Question 21

What is a central goal of OOP?

Answer 21

Allow you to build modular software that break code up into smaller

Question 22

How can you separate code into smaller chunks that hold key structures and classes with movement between each other?

Answer 22

This can be done with import statement. You import modules.

Question 23

Creating modular code provides the following benefits?

Answer 23

1. Easier readability/maintainability
2. Low coupling/high cohesion
3. Code reusability
4. Collaboration

Question 24

Which module types are there?

Answer 24

1. Third party modules imported in Python library
2. Hand made appending with a .py extenion

Question 25

What is the command for importing modules?

Answer 25

import

Question 26

Which modules are interesting for you code?

Answer 26

The modules without the _ in the library

Question 27

Can you shorten module names?

Answer 27

Yes

Question 28

Which command do you use to import the netmiko module?

Answer 28

from netmiko import ConnectHandler

Question 29

There are several data input types such as data from a website

Answer 29

API or a file. What is the big trick with this data?

Question 30

Which sign is used to start with a new line?

Answer 30

/n

Question 31

Whare are the two requirements with the open() function?

Answer 31

The name of the file you want to work with. The function (e.g. read

Question 32

What are the open functions?

Answer 32

1. r: open for reading (default) 2. w: open for writing 3. x: open for exclusive creation 4. a: open for writing 5. b: open in binary mode 6. t: open in text mode(default) 7. +: open for updating (reading and writing)

Question 33

How do you close the file?

Answer 33

close()

Question 34

How do you open the file?

Answer 34

open()

Question 35

What happens when you don’t close the file?

Answer 35

File stays open and you might run in a file lock

Question 36

What is the benefit of the with statement instead of only the open statement?

Answer 36

Uses the open() function but doenst require direct assignement to a variable and automatically closes the file when you are ready

Question 37

What are the most common data forms?

Answer 37

1. CSV 2. XML 3. JSON 4. YAML

Question 38

What is the with function benefit?

Answer 38

Display information in an easier way

Question 39

From which data structure is JSON derived?

Answer 39

Java

Question 40

What is the JSON data structure?

Answer 40

Built around key/value pairs that simplify mapping of data and its retrieval

Question 41

What is the nesting capability of JSON?

Answer 41

You start with a main data object

Question 42

What is the convert JSON statement for python lists

Answer 42

JSON Array

Question 43

What is the convert JSON statement for python dictonary?

Answer 43

JSON Objects

Question 44

What are the four functions that you perform to convert JSON data into Python objects and back?

Answer 44

1. load() 2. loads() 3. dump() 4. dumps()

Question 45

Where does the S for refers in load/loads and dump/dumps?

Answer 45

Refers to a string

Question 46

Where stands XML For?

Answer 46

Extensible Markup Language

Question 47

Where is XML most used for?

Answer 47

Configuration automation

Question 48

To which language did XML look like?

Answer 48

HTML. It is developed to work hand-in-hand with HTML for data transport and storage between web-services and APIs

Question 49

Which structure has XML?

Answer 49

Tree structure. With ROOT element on the top

Question 50

Where stands JSON for?

Answer 50

JavaScript Object Notation

Question 51

Which kind of relationship is there between XML elements?

Answer 51

Parent/Child

Question 52

Which model you can use to convert XML into an ordered dictonary in Python?

Answer 52

Module: xmltodict

Question 53

Where stands YAML for?

Answer 53

YAML Ain't Markup Language?

Question 54

What is the big difference between YAML and XML/JSON

Answer 54

Very easy readable. Much simpler syntax/structure

Question 55

On which language is YAML based?

Answer 55

JSON

Question 56

With which sign you can create a list to identify elements?

Answer 56

-

Question 57

What do you need to do to work with Python and YAML?

Answer 57

Import the PyYaml module

Question 58

To which Python state are YAML object converted?

Answer 58

Python dictonaries

Question 59

To which Python state are YAML list converted?

Answer 59

Python lists

Question 60

Which function converts YAML object to python?

Answer 60

yaml.load

Question 61

Which function converts python to YAML objects?

Answer 61

yaml.dump

Question 62

What is used to tell the users what they did wrong and let them try again?

Answer 62

try-except-else-finaly code block

Question 63

What can you do to add error handeling to your code?

Answer 63

use the try statement in the code

Question 64

Where stands TDD for?

Answer 64

Test-Driven Development

Question 65

What is the TDD loop?

Answer 65

1. Write Test 2. Test Fails 3. Write Code 4. Test Passes 5. Refactor

Question 66

What is the benefit of TDD?

Answer 66

That you write code with de goa lin mind

Question 67

Is there a built-in test module in Python?

Answer 67

Yes

Question 68

You need to know how unittest works for DEVASC!

Answer 68

TEST!!!

Question 69

How can you define a function?

Answer 69

1. Use the keyword def 2. A name for the function 3. A set of parentheses enclosing any arguments you want to pass to the function 4. And a colon at the end

Question 70

The name of the function must follow three rules:

Answer 70

1. Must not start with a number 2. Must not be a reserved Python word (print(), input(), etc) 3 Can ben any combination of the: A-Z, a-z, 0-9, _, -

Question 71

How do you start working with CSV import to Python?

Answer 71

Code: import csv samplefile = open('routerlist.csv') samplereader = csv.reader(samplefile) sampledata = list(samplereader) sampledata