phrase = "Duke Blue Devils"
print phrase[5:10] + phrase[:4]
Blue Duke


pos = phrase.find("ev")
print pos
11


phrase[phrase.find("ev"):].upper()
Out[6]: 'EVILS'


phrase[:pos] + phrase[pos:].upper()
Out[7]: 'Duke Blue DEVILS'


phrase[1] = "o"
Traceback (most recent call last):
  File "C:\Users\Susan\AppData\Local\Enthought\Canopy\User\lib\site-packages\IPython\core\interactiveshell.py", line 2885, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-8-db156d357ef5>", line 1, in <module>
    phrase[1] = "o"
TypeError: 'str' object does not support item assignment

phrase = phrase[0] + "o" + phrase[2:]
print phrase
Doke Blue Devils

type(phrase)
Out[11]: str
type(phrase[0])
Out[12]: str


x = phrase.split()
type(x)
Out[14]: list


print phrase
Doke Blue Devils

print x
['Doke', 'Blue', 'Devils']
len(x)
Out[17]: 3