Coding questions

Question 1

What is the difference between list and tuples in Python?

Answer 1

Lists are mutable, can be edited. Tuples are immutable.
Lists are slower than tuples.
Lists use [] tuples use ()

Question 2

What are the key features of python?

Answer 2

• its an interpreted language, does not need to be compiled before its run.
• you don’t need to tell it what type of variables you’re making.

Question 3

What type of language is python? programming or scripting?

Answer 3

• capable of scripting, but in general it is considered programming.

Question 4

Explain how python is an interpreted language

Answer 4

any programming language which is not in machine-level code before runtime.

Question 5

what is pep 8?

Answer 5

Python Enhancement Proposal. a set of rules that specify how to format python code for maximum readability.

Question 6

Benefits of using python

Answer 6

• easy to use.
• interpreted language i.e. executes the code line by line and stops if an error occurs in any line.
• free and open source
• python has vast libraries that contain almost any function needed.
• portable i.e. can run on any platform.

Question 7

what are python namespaces?

Answer 7

the name which is assigned to each object in python.  the objects are variables and functions. 
4 types of namespaces:
1. built in 
2. global 
3. enclosing
4. local

Question 8

What are the common built in data types in python/

Answer 8

numbers - integers, floats, complex numbers. 
list 
tuple
string
set
dictionary
boolean

Question 9

What is the difference between .py and .pyc files?

Answer 9

.py files are python source code files.

.pyc files contain the btyecode of the python files.

Question 10

What is slicing in python

Answer 10

used to access parts of sequences like lists, tuples, strings. [start:end:step]

Question 11

how to combine data frames in pandas?

Answer 11

1. concatenating by stacking vertically
2. concatenating by stacking horizontally
3. combining on a common column. (joining)
   pd. concat()

Question 12

what are python modules

Answer 12

files containing python code. 
os
sys
math
random
data time

Question 13

what is type conversion

Answer 13

conversion of one data type into another
int()
float()

Question 14

difference between arrays and lists

Answer 14

have the same way of storing data.

Arrays can hold a single data type whereas lists can old any data type.

Question 15

What does [::-1] do?

Answer 15

reverses the order of an array

Question 16

how can you randomise the items of a list in place

Answer 16

from random import shuffle
x = []
shuffle(x)

Question 17

how can you generate random numbers

Answer 17

import random

random.random

Question 18

What process happens after you type in a website’s URL?

Answer 18

browser looks up IP address for domain name
browser sends a HTTP request to server
server sends back HTTP response

Question 19

Big O notation

Answer 19

describes the limiting behaviour of a function, either its runtime or space-complexity. Used for seeing how much work has to be done by the function when the input increases