List

>>> python_versions = [1.0, 1.5, 1.6, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6]
>>> python_versions[0]
1.0
>>> python_versions[1]
1.5
>>> python_versions[7]
2.4
>>> python_versions[-1]
3.6

Error

>>> my_list = ['a','b','c','d','e']
>>> my_list[4]
'e'
>>> my_list[5]

Traceback (most recent call last):
  File "", line 1, in 
    my_list[5]
IndexError: list index out of range

def how_many_days(month_number):
    days_in_month = [31,28,31,30,31,30,31,31,30,31,30,31]
    return days_in_month[month_number-1]
    
print(how_many_days(8))

slice

>>> months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
>>> q3 = months[6:9]
>>> print(q3)
['July', 'August', 'September']
>>> print(months)
['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']

eclipse_dates = ['June 21, 2001', 'December 4, 2002', 'November 23, 2003',
                 'March 29, 2006', 'August 1, 2008', 'July 22, 2009',
                 'July 11, 2010', 'November 13, 2012', 'March 20, 2015',
                 'March 9, 2016']
                 
last_eclipse= eclipse_dates[-3:]                 
print(last_eclipse)

>>> sample_string = "And Now For Something Completely Different"
>>> sample_list = ['Graham', 'John', 'Terry', 'Eric', 'Terry', 'Michael']
>>> sample_string[4]
'N'
>>> sample_list[4]
'Terry'
>>> sample_string[12:21]
'Something'
>>> sample_list[2:4]
['Terry', 'Eric']
>>> len(sample_string)
42
>>> len(sample_list)
6
>>> 'thing' in sample_string
True
>>> 'Rowan' in sample_list
False