>>> def f():
...   return (1, 2)
...
>>> 1, 2
(1, 2)
>>> (1, 2)
(1, 2)
>>> kinds = ['peregrine falcon', 'harrier falcon', 'red-tailed hawk', 'osprey']
>>> kinds
['peregrine falcon', 'harrier falcon', 'red-tailed hawk', 'osprey']
>>> counts = [1, 5, 2, 11]
>>> counts
[1, 5, 2, 11]
>>> kinds[0], counts[0]
('peregrine falcon', 1)
>>> kinds
['peregrine falcon', 'harrier falcon', 'red-tailed hawk', 'osprey']
>>> counts
[1, 5, 2, 11]
>>> kinds.index ('osprey')
3
>>> counts[3]
11
>>> import sighting1
>>> kinds
['peregrine falcon', 'harrier falcon', 'red-tailed hawk', 'osprey']
>>> counts
[1, 5, 2, 11]
>>> sighting1.new_sighting (kinds, counts, 'osprey')
>>> kinds
['peregrine falcon', 'harrier falcon', 'red-tailed hawk', 'osprey']
>>> counts
[1, 5, 2, 12]
>>> sighting1.new_sighting (kinds, counts, 'bluejay')
>>> kinds
['peregrine falcon', 'harrier falcon', 'red-tailed hawk', 'osprey', 'bluejay']
>>> counts
[1, 5, 2, 12, 1]
>>> from bird_dict import bird_dict
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 11, 'harrier falcon': 5}

>>> type (bird_dict)
<type 'dict'>
>>> import sighting2
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 11, 'harrier falcon': 5}

>>> sighting2.new_sighting (bird_dict, 'osprey')
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5}

>>> sighting2.new_sighting (bird_dict, 'crow')
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 1}
>>> lst = [1,2,3]
>>> lst.append (4)
>>> lst
[1, 2, 3, 4]
>>> lst = lst + [5]
>>> lst
[1, 2, 3, 4, 5]
>>> d = {}
>>> d
{}
>>> d['bluejay'] = 1
>>> d
{'bluejay': 1}
>>> list('abc')
['a', 'b', 'c']
>>> dict ([(1, 2), (3, 4)])
{1: 2, 3: 4}
>>> d = {'name':'dan'}
>>> d
{'name': 'dan'}
>>> d['vocation'] = 'instructor'
>>> d
{'vocation': 'instructor', 'name': 'dan'}
>>> d
{'vocation': 'instructor', 'name': 'dan'}
>>> d[vocation] # vocation is not a variable!
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'vocation' is not defined
>>> d['vocation']
'instructor'
>>> d['name']
'dan'
>>> d['garbage']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'garbage'
>>> d['instructor']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'instructor'
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 1}
>>> bird_dict['osprey']
12
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 1}
>>> bird_dict['garbage']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'garbage'
>>> bird_dict.get ('crow')
1
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 1}
>>> bird_dict.get('garbage') # returns None
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 1}
>>> bird_dict.get('penguin')
>>> bird_dict.get ('penguin', 0)
0
>>> bird_dict.get ('osprey', 0)
12
>>> bird_dict.get ('sparrow', 'key not found')
'key not found'
>>> dir (dict)
['__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', '__doc__'
, '__eq__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '
__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__re
duce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__str__', '
clear', 'copy', 'fromkeys', 'get', 'has_key', 'items', 'iteritems', 'iterkeys',
'itervalues', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 1}
>>> bird_dict['crow'] = 0
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5,
 'crow': 0}
>>> del bird_dict['crow']
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5}

>>> u = 42
>>> u
42
>>> del u # works for variables, too
>>> u
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'u' is not defined
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5}

>>> bird_dict.keys()
['peregrine falcon', 'red-tailed hawk', 'osprey', 'harrier falcon']
>>> bird_dict.values()
[1, 2, 12, 5]
>>> bird_dict.items()
[('peregrine falcon', 1), ('red-tailed hawk', 2), ('osprey', 12), ('harrier falc
on', 5)]
>>> lst = bird_dict.items()
>>> lst
[('peregrine falcon', 1), ('red-tailed hawk', 2), ('osprey', 12), ('harrier falc
on', 5)]
>>> lst[0]
('peregrine falcon', 1)
>>> lst[0][0]
'peregrine falcon'
>>> d
{'vocation': 'instructor', 'name': 'dan'}
>>> d.clear()
>>> d
{}
>>> d = {}
>>> d[4] = 'a'
>>> d['4'] = 'b'
>>> d
{4: 'a', '4': 'b'}
>>> d[4] = 5
>>> print d[4]
5
>>> print d['4']
b
>>> d
{4: 5, '4': 'b'}
>>> d[4] = ['a', 'b']
>>> d
{4: ['a', 'b'], '4': 'b'}
>>> d[4]
['a', 'b']
>>> d[4][1]
'b'
>>> d[[2,3,4]] = 5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list objects are unhashable
>>> d
{4: ['a', 'b'], '4': 'b'}
>>> d[4] = [d[4], 'x']
>>> d[4]
[['a', 'b'], 'x']
>>> d[4] = d
>>> d
{4: {...}, '4': 'b'}
>>> del d # this was a scary one!
>>> d
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'd' is not defined
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5}
>>> for k in bird_dict:
...   print k
...
peregrine falcon
red-tailed hawk
osprey
harrier falcon
>>> for k in bird_dict:
...   print k, bird_dict[k]
...
peregrine falcon 1
red-tailed hawk 2
osprey 12
harrier falcon 5
>>> bird_dict.items()
[('peregrine falcon', 1), ('red-tailed hawk', 2), ('osprey', 12), ('harrier falc
on', 5)]
>>> for (k, v) in bird_dict.items():
...   print k, v
...
peregrine falcon 1
red-tailed hawk 2
osprey 12
harrier falcon 5
>>> for k in bird_dict:
...   print k
...
peregrine falcon
red-tailed hawk
osprey
harrier falcon
>>> bird_dict.sort()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'dict' object has no attribute 'sort'
>>> bird_dict
{'peregrine falcon': 1, 'red-tailed hawk': 2, 'osprey': 12, 'harrier falcon': 5}

>>> lst = bird_dict.keys()
>>> lst
['peregrine falcon', 'red-tailed hawk', 'osprey', 'harrier falcon']
>>> lst.sort()
>>> lst
['harrier falcon', 'osprey', 'peregrine falcon', 'red-tailed hawk']
>>> for k in lst:
...   print k, bird_dict[k]
...
harrier falcon 5
osprey 12
peregrine falcon 1
red-tailed hawk 2
>>> for k in bird_dict.keys.sort():
...   print k, d[k]
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'builtin_function_or_method' object has no attribute 'sort'
# Remember: the sort method returns None!
>>> for k in bird_dict.keys().sort():
...   print k, bird_dict[k]
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not iterable
>>> lst = [1, 2, 3]
>>> temp = lst.sort()
>>> print temp
None