codeaft@codeaft:~$ python3
...
>>> codeaft="KoDiNgWiNdOw"
>>> codeaft.casefold()
'codeaft'

>>> codeaft="CODEAFT"
>>> codeaft.casefold()
'codeaft'

>>> codeaft="codeaft"
>>> codeaft.casefold()
'codeaft'

>>> codeaft="koding window"
>>> codeaft.capitalize()
'Koding window'

>>> codeaft.title()
'Koding Window'    

>>> codeaft="codeaft"
>>> codeaft.upper()
'CODEAFT'

>>> codeaft="CODEAFT"
>>> codeaft.lower()
'codeaft'

>>> codeaft="Codeaft"
>>> codeaft.swapcase()
'kODINGwINDOW'    

>>> codeaft="Codeaft"
>>> codeaft.rjust(20)
'        Codeaft'

>>> codeaft.ljust(20)
'Codeaft        '

>>> codeaft="    Codeaft           "
>>> codeaft.strip()
'Codeaft' 

>>> codeaft.rstrip()
'    Codeaft'

>>> codeaft.lstrip()
'Codeaft           '

>>> codeaft="Codeaft"
>>> codeaft.find("W",0,len(codeaft))
6

>>> codeaft.find("in",0,len(codeaft))
3

>>> codeaft.count("in",1,len(codeaft))
2

>>> codeaft.count("o",1,len(codeaft))
2  

>>> codeaft=["K","O","D","I","N","G","W","I","N","D","O","W"]
>>> codeaft.sort()
>>> codeaft
['D', 'D', 'G', 'I', 'I', 'K', 'N', 'N', 'O', 'O', 'W', 'W']

>>> codeaft=("K","O","D","I","N","G","W","I","N","D","O","W")
>>> codeaft.sort()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'sort'

>>> codeaft="Codeaft"
>>> codeaft.startswith("k")
False

>>> codeaft.startswith("K")
True

>>> codeaft.startswith("Codeaft")
True

>>> codeaft.endswith("Codeaft")
True

>>> codeaft.endswith("ow")
True

>>> codeaft.endswith("W")
False  

>>> codeaft="Codeaft"
>>> len(codeaft)
12

>>> codeaft.zfill(12)
'Codeaft'

>>> codeaft.zfill(15)
'000Codeaft'

>>> codeaft.zfill(0)
'Codeaft'    

>>> codeaft.replace("i","###")
'Kod###ngW###ndow'

>>> codeaft.replace("W","###",1)
'Koding###indow'

>>> codeaft.replace("d","###",2)
'Ko###ingWin###ow'

>>> codeaft="Koding\nWindow"
>>> codeaft.splitlines()
['Koding', 'Window']

>>> codeaft.split("\n")
['Koding', 'Window']    

>>> 'Hello, World!'.split()
['hello,', 'world!']

>>> s1=("Hello, World!")
>>> ''.join(sorted(s1))
' !,HWdellloor'

>>> ''.join(sorted(s1)).strip()
'!,HWdellloor'

>>> print(sorted(s1))
[' ', '!', ',', 'H', 'W', 'd', 'e', 'l', 'l', 'l', 'o', 'o', 'r']

>>> ''.join(sorted(set(s1)))
' !,HWdelor'

>>> strings="Kiwi Apple Orange Banana Kiwi Apple Kiwi"
>>> words=strings.split()
>>> print(' '.join(sorted(set(words),key=words.index)))
Kiwi Apple Orange Banana