>>> import sys; print('%s %s' % (sys.executable or sys.platform,
sys.version))
Failed to read servers response: Connection refused>>> 
Failed to read servers response: Connection refused>>> 
>>> d = {}
>>> d
{}
>>> d["apple"] = 5
>>> d
{'apple': 5}
>>> d = {}
>>> x = ["dog", "cat", "dog", "cat", "elephant"]
>>> for e in x:
...     if e in d:
...         d[e] += 1
...     else:
...         d[e] = 1
... 
>>> d
>>> d
{'elephant': 1, 'dog': 2, 'cat': 2}
{'elephant': 1, 'dog': 2, 'cat': 2}
>>> d.items()
[('elephant', 1), ('dog', 2), ('cat', 2)]
>>> d['hyena'] += 5
>>> 
Traceback (most recent call last):
  File "<console>", line 1, in <module>
KeyError: 'hyena'
>>> d
{'elephant': 1, 'dog': 2, 'cat': 2}
>>> d['elephant'] += 5
>>> d
{'elephant': 6, 'dog': 2, 'cat': 2}
>>> d.get('elephant')
6
>>> d['elephant']
6
>>> d.get('hyena')
>>> 
>>> d
{'elephant': 6, 'dog': 2, 'cat': 2}
>>> ret = d.get('hyena')
>>> type(ret)
<type 'NoneType'>
>>> d['hyena']
Traceback (most recent call last):
  File "<console>", line 1, in <module>
KeyError: 'hyena'
>>> d.get('hyena',0)
0
>>> d.get('capebuffalo',7)
7
>>> d
{'elephant': 6, 'dog': 2, 'cat': 2}
>>> d
{'elephant': 6, 'dog': 2, 'cat': 2}
>>> d.items()
[('elephant', 6), ('dog', 2), ('cat', 2)]
>>> sorted(d.items())
[('cat', 2), ('dog', 2), ('elephant', 6)]
>>> d['aardvark
  File "<console>", line 1
    d['aardvark
              ^
SyntaxError: EOL while scanning string literal
>>> d['aardvark']  = 57
>>> d
{'aardvark': 57, 'elephant': 6, 'dog': 2, 'cat': 2}
>>> sorted(d.items())
[('aardvark', 57), ('cat', 2), ('dog', 2), ('elephant', 6)]
>>> d.items()
[('aardvark', 57), ('elephant', 6), ('dog', 2), ('cat', 2)]
>>> z = [(t[1],t[0]) for t in d.items()]
>>> z
[(57, 'aardvark'), (6, 'elephant'), (2, 'dog'), (2, 'cat')]
>>> sorted(z)
[(2, 'cat'), (2, 'dog'), (6, 'elephant'), (57, 'aardvark')]
>>> import operator
>>> d.items()
[('aardvark', 57), ('elephant', 6), ('dog', 2), ('cat', 2)]
>>> sorted(d.items(), key=operator.itemgetter(1))
[('dog', 2), ('cat', 2), ('elephant', 6), ('aardvark', 57)]
>>> x = (3,4,5,6)
>>> len(x)
4
>>> x[2]
5
>>> x[7]
Traceback (most recent call last):
  File "<console>", line 1, in <module>
IndexError: tuple index out of range
>>> for e in x:
...     print e
... 
3
4
5
6
>>> x
(3, 4, 5, 6)
>>> d
{'aardvark': 57, 'elephant': 6, 'dog': 2, 'cat': 2}
>>> d.items()
[('aardvark', 57), ('elephant', 6), ('dog', 2), ('cat', 2)]
>>> alph = sorted(d.items())
>>> alph
[('aardvark', 57), ('cat', 2), ('dog', 2), ('elephant', 6)]
>>> sorted(alph,key=operator.itemgetter(1),reverse=True)
[('aardvark', 57), ('elephant', 6), ('cat', 2), ('dog', 2)]
>>>