Python 2.7.9 (default, Apr  2 2015, 15:33:21) 
[GCC 4.9.2] on linux2
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
>>> animal_dict
{'A23': 'tapir', 'B12': 'wombat', 'B19': 'crocodile'}
>>> animal_dict['B12']
'wombat'
>>> animal_dict['Q20'] = 'wombat'
>>> animal_dict
{'Q20': 'wombat', 'A23': 'tapir', 'B12': 'wombat', 'B19': 'crocodile'}
>>> animal_dict['A23'] = 'tiger'
>>> animal_dict
{'Q20': 'wombat', 'A23': 'tiger', 'B12': 'wombat', 'B19': 'crocodile'}
>>> animal_dict.keys()
['Q20', 'A23', 'B12', 'B19']
>>> animal_dict.values()
['wombat', 'tiger', 'wombat', 'crocodile']
>>> 'Q20' in animal_dict
True
>>> 'K10' in animal_dict
False
>>> 'wombat' in animal_dict
False
>>> 'wombat' in animal_dict.values()
True
>>> len(animal_dict)
4
>>> del animal_dict['B12']
>>> animal_dict
{'Q20': 'wombat', 'A23': 'tiger', 'B19': 'crocodile'}
>>> 
>>> 
>>> 
>>> for habitat in animal_dict:
	print "In " + habitat + " is a " + animal_dict[habitat]

	
In Q20 is a wombat
In A23 is a tiger
In B19 is a crocodile
>>> for habitat in sort(animal_dict.keys()):
	print "In " + habitat + " is a " + animal_dict[habitat]

	

Traceback (most recent call last):
  File "<pyshell#23>", line 1, in <module>
    for habitat in sort(animal_dict.keys()):
NameError: name 'sort' is not defined
>>> for habitat in sorted(animal_dict.keys()):
	print "In " + habitat + " is a " + animal_dict[habitat]

	
In A23 is a tiger
In B19 is a crocodile
In Q20 is a wombat
>>> ================================ RESTART ================================
>>> 
>>> counts('ceccceec???????????????')

Traceback (most recent call last):
  File "<pyshell#26>", line 1, in <module>
    counts('ceccceec???????????????')
  File "/home/brent/teaching/150/lectures/python/dictionaries.py", line 43, in counts
    count_dict[c] += 1
KeyError: 'c'
>>> animal_dict['K22']

Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
    animal_dict['K22']
KeyError: 'K22'
>>> ================================ RESTART ================================
>>> 
>>> counts('ceccceec???????????????')
{'c': 5, 'e': 3, '?': 15}
>>> ================================ RESTART ================================
>>> 
>>> counts2('ceccceec???????????????')
{'c': 5, 'e': 3, '?': 15}
>>> ================================ RESTART ================================
>>> 
>>> counts('ceccceec???????????????')
{'c': 5, 'e': 3, '?': 15}
>>> normalize_dict(counts('ceccceec???????????????'))
{'c': 0.21739130434782608, 'e': 0.13043478260869565, '?': 0.6521739130434783}
>>> normalize_dict(counts('aabc'))
{'a': 0.5, 'c': 0.25, 'b': 0.25}
>>>