Lecture_12

@ For statement

stairs = (1, 2, 3, 4, 5, 6)
>>> len(stairs)
6
>>> stairs[6]
6
>>> stairs.count(3)
1

def count(s, value):
    total = 0
    for element in s:
        if element == s:
            total = total + 1
    return total

# creating a range:
>>> tuple(range(0,4))
(0, 1, 2, 3)

@ membership:
list = (1, 2, 3, 4)
>>> 2 in list
True
>>> 5 in list
False
>>> 5 not in list
True

@ List"
Say A is a list.
A.pop()
A.extend()
A.remove()
A.append()

Example of list comprehension:
>>> suits = ['spade', 'club', 'heart', 'diamond']
>>> [suit.upper() for suit in suits]
['SPADE', 'CLUB', 'HEART', 'DIAMOND']
>>> [suit[1:4] for suit in suits if len(suit) == 5]
['ear', 'pad']

List Comprehension: [<map ex> for <name> in <iter exp> if <filterexp>]

@ Dictionary:

numerals = ['A':10, 'B':20]
>>> numerals.get('A', 0)
10
>>> numerals.get('C', 0)
0

# Another way to create a dictioanry:
>>> dict([(2,3), (3,4), (4,9)])
{2:3, 3:4, 4:9}

@ Dictionary Comprehension
>>> {k: k*k for k in range(3,6)}
{3:9, 4:16, 5:25}