Editing DS4UX (Spring 2016)/Day 3 lecture (section)

== Review of some important Week 2 concepts ==
===Lists===

* Use lists to store data where order matters.
* Lists are indexed starting with 0.

====List initialization====

 >>> my_list = []
 >>> my_list
 []
 >>> your_list = ["a", "b", "c", 1, 2, 3]
 >>> your_list
 ['a', 'b', 'c', 1, 2, 3]

====Access and adding elements to a list====

 >>> len(my_list)
 0
 >>> my_list[0]
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 IndexError: list index out of range
 >>> my_list.append("Alice")
 >>> my_list
 ['Alice']
 >>> len(my_list)
 1
 >>> my_list[0]
 'Alice'
 >>> my_list.insert(0, "Amy")
 >>> my_list
 ['Amy', 'Alice']

 >>> my_list = ['Amy', 'Alice']
 >>> 'Amy' in my_list
 True
 >>> 'Bob' in my_list
 False

====Changing elements in a list====

 >>> your_list = []
 >>> your_list.append("apples")
 >>> your_list[0]
 'apples'
 >>> your_list[0] = "bananas"
 >>> your_list
 ['bananas']

====Slicing lists====

 >>> her_list = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
 >>> her_list[0]
 'a'
 >>> her_list[0:3]
 ['a', 'b', 'c']
 >>> her_list[:3]
 ['a', 'b', 'c']
 >>> her_list[-1]
 'h'
 >>> her_list[5:]
 ['f', 'g', 'h']
 >>> her_list[:]
 ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']

==== sorting lists ====

Use <code>.sort()</code> to sort a list:

 >>> names = ["Eliza", "Joe", "Henry", "Harriet", "Wanda", "Pat"]
 >>> names.sort()
 >>> names
 ['Eliza', 'Harriet', 'Henry', 'Joe', 'Pat', 'Wanda']
 >>> names.sort(reverse=True)
 ['Wanda', 'Pat', 'Joe', 'Henry', 'Harriet', 'Eliza']

==== Getting the maximum and minimum values from a list ====

 >>> numbers = [0, 3, 10, -1]
 >>> max(numbers)
 10
 >>> min(numbers)
 -1