phrase = 'Duke Blue Devils'
len(phrase)
Out[3]: 16

type(phrase)
Out[4]: str

print phrase[5:10] + phrase[:4]
Blue Duke

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

print phrase[0:pos] + phrase[pos:].upper()
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-9-ebdabe9e1baf>", 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[12]: str

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

print x
['Doke', 'Blue', 'Devils']

print phrase
Doke Blue Devils