Week 5

All the function learnt this week 

Storing multiple values
When storing more than one value it an get repetitive
Example - 
author1 = "J.K. Rowling"
author2 = "P. Pullman"
author3 = "S. Collins"
print(author1)
print(author2)

print(author3)
Instead we can make lists using a for loop
Example - 
authors = ["J.K. Rowling", "P. Pullman", "S. Collins"]
for author in authors:

  print(author)
or 
odds = [1, 3, 5, 7, 9]
print(odds)
Reading in Lists
Example - 
data = input("Enter your subjects: ")
subjects = data.split()
print(subjects)
Enter your subjects: hv kb jb
['hv', 'kb', 'jb']
or put it in a for loop to print it in a vertical list

Lists

Acessing list items:

Example - 

colours = ['red', 'blue', 'green', 'yellow']

print(colours[1])

print(colours[-1])

Changing list items; 

Example - 

colours = ['red', 'blue', 'green', 'yellow']

colours[0] = 'crimson'

colours[-2] = 'lime'

print(colours)

Sorting 

Use these functions for sorting data out, use  sort to sort alphabetically and in number order or append and add a variable into the brackets to sort from that variable. Also reverse will do the opposite. 

Append: 

Example - 

pets = ['dog', 'mouse', 'fish']

pets.append('cat')

print(pets)

['dog', 'mouse', 'fish', 'cat']

Sort:

Example - 

pets = ['dog', 'mouse', 'fish', 'cat']

pets.sort()

print(pets)

['cat', 'dog', 'fish', 'mouse']

Reverse; 

Example - 

pets = ['cat', 'dog', 'fish', 'mouse']

pets.reverse()

print(pets)

['mouse', 'fish', 'dog', 'cat']

List of words or characters 

Characters:

Example - 

print(list('hello'))

['h', 'e', 'l', 'l', 'o']

Words: 

Example - 

line = 'hello world'

words = line.split()

print(words)

['hello', 'world']

Creating sublists and finding indexes

Sublist:

Example - 

colours = ['red', 'blue', 'green', 'yellow']

fewer_colours = colours[:2]

print(fewer_colours)

['red', 'blue']

Indexes: 

Example - 

words = ['the', 'fox', 'jumped', 'over', 'the', 'dog']

print(words.index('fox'))

print(words.index('dog'))

1

5

Joining & Splitting 

Joining with spaces; 

Example - 

values = ['a', 'b', 'c', 'd', 'e']

print(' '.join(values))

a b c d e

Joining with seprator:

Example - 

sep = ':'

values = ['a', 'b', 'c', 'd', 'e']

print(sep.join(values))

a:b:c:d:e