Python crash course

Question 1

How to perform float division python

Answer 1

from __future__ import this

Question 2

What is mutable? Give a definition alternative

Answer 2

Mutable: once you set it , cant modify it . Lists vs Sets

Question 3

functions to present intrinsic elements of dictionaries

Answer 3

dict. values()
dict. keys()
dict. items #return the dict elements as a tuple

Question 4

What is counter from collections?

Answer 4

For a data structure, it counts how many times an element appears.

Question 5

Why to use sets?

Answer 5

Fast operations and checking membership

Question 6

Difference between sorted(list_) and list_.sort()

Answer 6

The second is in place sorting

Question 7

How to create function factories?

Answer 7

from functool import partial

new_func=partial(func,value=value_)

Question 8

What map function performs?

Answer 8

maps(func,iterable) is the signature of the function.

According to func, it transforms the iterable which may be anything.

Question 9

What does filter does

Answer 9

filter(func,iterable)

if func, which acts to the subsequent elements of an iterable, returns a true value then the element is kept.

Question 10

Which is the functionality of zip(list1,list2)?

Answer 10

Merges two lists

Question 11

What is ‘reduce’ function in python and how it is called?

Answer 11

The reduce() function accepts a function and a sequence and returns a single value calculated as follows:

Initially, the function is called with the first two items from the sequence and the result is returned.
The function is then called again with the result obtained in step 1 and the next value in the sequence. This process keeps repeating until there are items in the sequence.

reduce(func, iterable)

Question 12

Find minimum and maximum value of a list

Answer 12

min(list) max(list)

Question 13

What is dispersion? Define a simple measure in python

Answer 13

Dispersion is a metric how spread are our data. A simle metric for a list of data is range
def range(list_):
return max(list_) -min(list_)

Question 14

Describe a more complicated version of dispresion

Answer 14

A more complicated method of dispersion is variance

Question 15

If you want to generate random events in python, you can use random module. Define two use cases

Answer 15

import random

random. randint(x,y) #produce a random int between x and y
random. choice(iterable) #produce a random element from the iterable

Question 16

What is Jupyter Notebook?

Answer 16

The Jupyter Notebook is an interactive environment for running code in the browser.

Question 17

In scikit-learn, What is the fundamental data structure?

Answer 17

The NumPy array