String casefold(), capitalize() and title() methods
kodingwindow@kw:~$ python3
...
>>> kw="KoDiNgWiNdOw"
>>> kw.casefold()
'kodingwindow'

>>> kw="KODINGWINDOW"
>>> kw.casefold()
'kodingwindow'

>>> kw="kodingwindow"
>>> kw.casefold()
'kodingwindow'

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

>>> kw.title()
'Koding Window'
String upper(), lower() and swapcase() methods
>>> kw="kodingwindow"
>>> kw.upper()
'KODINGWINDOW'

>>> kw="KODINGWINDOW"
>>> kw.lower()
'kodingwindow'

>>> kw="Kodingwindow"
>>> kw.swapcase()
'kODINGWINDOW'
String rjust() and ljust() methods
>>> kw="Kodingwindow"
>>> kw.rjust(20)
'        Kodingwindow'

>>> kw.ljust(20)
'Kodingwindow        '
String strip(), rstrip(), and lstrip() methods
>>> kw="    Kodingwindow           "
>>> kw.strip()
'Kodingwindow' 

>>> kw.rstrip()
'    Kodingwindow'

>>> kw.lstrip()
'Kodingwindow           '
String find() and count() methods
>>> kw="Kodingwindow"
>>> kw.find("w",0,len(kw))
6

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

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

>>> kw.count("o",1,len(kw))
2
Strings sort() method
>>> kw=["K","O","D","I","N","G","W","I","N","D","O","W"]
>>> kw.sort()
>>> kw
['D', 'D', 'G', 'I', 'I', 'K', 'N', 'N', 'O', 'O', 'W', 'W']

>>> kw=("K","O","D","I","N","G","W","I","N","D","O","W")
>>> kw.sort()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'sort'
String startswith() and endswith() methods
>>> kw="Kodingwindow"
>>> kw.startswith("k")
False

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

>>> kw.startswith("Kodingwindow")
True

>>> kw.endswith("Kodingwindow")
True

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

>>> kw.endswith("W")
False
String zfill() and replace() method
>>> kw="Kodingwindow"
>>> len(kw)
12

>>> kw.zfill(12)
'Kodingwindow'

>>> kw.zfill(15)
'000Kodingwindow'

>>> kw.zfill(0)
'Kodingwindow'    

>>> kw.replace("i","###")
'Kod###ngw###ndow'

>>> kw.replace("w","###",1)
'Koding###indow'

>>> kw.replace("w","###",2)
'Koding###indo###'
String split() and splitlines() methods
>>> kw="Koding\nwindow"
>>> kw.splitlines()
['Koding', 'window']

>>> kw.split("\n")
['Koding', 'window']
String functions and operations
>>> '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
What Next?
Python Data Structures
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