Python 3.4.2 (v3.4.2:ab2c023a9432, Oct  5 2014, 20:42:22) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "copyright", "credits" or "license()" for more information.

>>> str = "hello"
>>> str += " there bear"
>>> str
'hello there bear'
>>> # we can index strings.
>>> mystring = "Computer Science"
>>> mystring
'Computer Science'
>>> mystring[0]
'C'
>>> mystring[5]
't'
# Note that mystring[8] is a blank; that's why we can't see it
>>> print(mystring[0],mystring[5],mystring[8])
C t  
# You can't access elements that don't exist!
>>> mystring[100]
Traceback (most recent call last):
  File "<pyshell#54>", line 1, in <module>
    mystring[100]
IndexError: string index out of range
>>> mystring[-4]
'e'
>>> # how do i print the last character of a string?
>>> mystring
'Computer Science'
>>> len(mystring)
16
>>> mystring
'Computer Science'
>>> len([1,2,3])
3
>>> len(mystring)
16
>>> mystring = 'hello'
>>> len(mystring)
5
>>> # a general statment for printing the last element of mystring
>>> print(mystring[len(mystring)-1])
o
>>> mystring = "Computer Science"
>>> print(mystring[len(mystring)-1])
e
>>> mystring
'Computer Science'
# The index has to be an int; a float does not make sense
>>> mystring[1.2]
Traceback (most recent call last):
  File "<pyshell#70>", line 1, in <module>
    mystring[1.2]
TypeError: string indices must be integers
>>> ## Next BIG topic
>>> ## loops other than for loops 
>>> ## while condition
>>> ##    body

####  Next topic (a short one)
>>> ## just a short hand
>>> ## easy
>>> count = 0
>>> count = count + 1
>>> count += 1
>>> count
2
>>> count += 55
>>> count
57
>>> count -= 5
>>> count
52
>>> count -= 2
>>> count
50
>>> count *= 3
>>> count
150
>>> # x op= y
>>> # does that make sense?  Yes, iff the following makes sense
>>> # x = x op y
>>> "bw" + "ha" * 44
'bwhahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha'
>>> str = 'ha'
>>> 
>>> st = 'ha'
>>> st = st * 4
>>> st
'hahahaha'
>>> st = 'ha'
>>> st *= 4
>>> st
'hahahaha'