Python,Lists and Dictionaries
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<![CDATA[
>>> rec = {}
>>> rec['name'] = 'mel'
>>> rec['age'] = 41
>>> rec['job'] = 'trainer/write'
>>>
>>> print rec['name']
mel
>>> mel = { 'name': 'Mark',
... 'jobs': ['trainer', 'writer'],
... 'web': 'www.rmi.net/~lutz',
... 'home':{'state': 'CO', 'zip':80501}}
>>> mel['name']
'Mark'
>>> mel['jobs']
['trainer', 'writer']
>>> mel['jobs'][1]
'writer'
>>> mel['home']['zip']
80501
>>>
>>> table = {'Python': 'Guido van Rossum',
... 'Perl': 'Larry Wall',
... 'Tcl': 'John Ousterhout'}
>>> language = 'Python'
>>> creator = table[language]
>>> creator
'Guido van Rossum'
>>> for lang in table.keys():
... print lang,'\t',table[lang}
File "<stdin>", line 2
print lang,'\t',table[lang}
^
IndentationError: expected an indented block
>>> print lang,'\t',table[lang]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
NameError: name 'lang' is not defined
>>> for lang in table.keys():
... print lang,'\t',table[lang]
File "<stdin>", line 2
print lang,'\t',table[lang]
^
IndentationError: expected an indented block
>>> table
{'Python': 'Guido van Rossum', 'Tcl': 'John Ousterhout', 'Perl': 'Larry Wall'}
>>> for lang in table.keys():
... print lang, '\t', table[lang]
...
Python Guido van Rossum
Tcl John Ousterhout
Perl Larry Wall
>>>
>>> L = []
>>> L[99] = 'spam'
Traceback (most recent call last):
File "<stdin>", line 1, in ?
IndexError: list assignment index out of range
>>> D = {}
>>> D[99] = 'spam'
>>> D[99]
'spam'
>>> D
{99: 'spam'}
>>> Matrix = {}
>>> Matrix[(2,3,4)] = 88
>>> Matrix[(7,8,9)] = 99
>>>
>>> X = 2; Y = 3; Z = 4
>>> Matrix[(X,Y,Z)]
88
>>> Matrix
{(2, 3, 4): 88, (7, 8, 9): 99}
>>> Matrix[(2,3,6)]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
KeyError: (2, 3, 6)
>>> if Matrix.has_key[(2,3,6)]:
... print Matrix[(2,3,6)]
... else:
... print 0
...
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: unsubscriptable object
>>> try:
... print Matrix[(2,3,6)]
... except KeyError:
... print 0
...
0
>>> if Matrix.has_key[(2,3,6)]:
... print Matrix[(2,3,6)]
... else:
... print 0
...
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: unsubscriptable object
>>> Matrix.get(2,3,4), 0)
File "<stdin>", line 1
Matrix.get(2,3,4), 0)
^
SyntaxError: invalid syntax
>>> Matrix.get((2,3,4), 0)
88
>>> Matrix.get((2,3,6), 0)
0
>>>
>>> d2 = {'spam':2, 'ham':1,'eggs':3}
>>> ds['spam']
Traceback (most recent call last):
File "<stdin>", line 1, in ?
NameError: name 'ds' is not defined
>>> d2['spam']
2
>>> d2
{'eggs': 3, 'ham': 1, 'spam': 2}
>>> len(d2)
3
>>> d2.has_key('ham')
True
>>> 'ham' in d2
True
>>> d2.keys()
['eggs', 'ham', 'spam']
>>> d2['ham'] = ['grill', 'bake', 'fry']
>>> d2
{'eggs': 3, 'ham': ['grill', 'bake', 'fry'], 'spam': 2}
>>> del de['eggs']
Traceback (most recent call last):
File "<stdin>", line 1, in ?
NameError: name 'de' is not defined
>>> del d2['eggs']
>>> d2
{'ham': ['grill', 'bake', 'fry'], 'spam': 2}
>>> d2['brunch'] = 'Bacon'
>>> d2
{'brunch': 'Bacon', 'ham': ['grill', 'bake', 'fry'], 'spam': 2}
>>> d2.values(), d2.items()
(['Bacon', ['grill', 'bake', 'fry'], 2], [('brunch', 'Bacon'), ('ham', ['grill',
'bake', 'fry']), ('spam', 2)])
>>> d2.get('spam'), d2.get('toast'), d2.get('toast', 88)
(2, None, 88)
>>> d2
{'brunch': 'Bacon', 'ham': ['grill', 'bake', 'fry'], 'spam': 2}
>>> d3 = {'toast':4, 'muffin':5}
>>> d2.update(d3)
>>> d2
{'toast': 4, 'muffin': 5, 'brunch': 'Bacon', 'ham': ['grill', 'bake', 'fry'], 's
pam': 2}
>>>
>>> len([1,2,3])
3
>>> [1,2,3]+[4,5,6]
[1, 2, 3, 4, 5, 6]
>>> ['Ni!']*5
['Ni!', 'Ni!', 'Ni!', 'Ni!', 'Ni!']
>>> 3 in [1 2 3
File "<stdin>", line 1
3 in [1 2 3
^
SyntaxError: invalid syntax
>>> 3 in [1 2 3]
File "<stdin>", line 1
3 in [1 2 3]
^
SyntaxError: invalid syntax
>>> 3 in [1, 2, 3]
True
>>> for x in [1,2,3]:print x,
...
1 2 3
>>> [1,2] + list("34")
[1, 2, '3', '4']
>>> L = ['spam', 'Spam', 'SPAM!']
>>> L[2]
'SPAM!'
>>> L[-2]
'Spam'
>>> L[1:]
['Spam', 'SPAM!']
>>> matrix = [[1,2,3],[4,5,6],[7,8,9]]
>>> matrix[1]
[4, 5, 6]
>>> matrix[1][1]
5
>>> matrix=[[1,2,3],
... [4,5,6],
... [7,8,9]]
>>> matrix[1][1]
5
>>>
>>> L = ['spam', 'Spam', 'SPAM!']
>>> L
['spam', 'Spam', 'SPAM!']
>>> L.append('please')
>>> L
['spam', 'Spam', 'SPAM!', 'please']
>>> L.sort()
>>> L
['SPAM!', 'Spam', 'please', 'spam']
>>> L = [1,2]
>>> L.extend([3,4,5])
>>> L
[1, 2, 3, 4, 5]
>>> L.pop()
5
>>> L
[1, 2, 3, 4]
>>> L.reverse()
>>> L
[4, 3, 2, 1]
>>> L =[]
>>> L.append(1)
>>> L.append(2)
>>> L
[1, 2]
>>> L.pop()
2
>>> L
[1]
>>> L = ['SPAM!', 'eat', 'more', 'please']
>>> del[0]
SyntaxError: can't assign to literal
>>> del L[0]
>>> L
['eat', 'more', 'please']
>>> del L[1:]
>>> L
['eat']
>>> L = ['Already', 'got', 'one']
>>> L[1:] = []
>>> L
['Already']
>>> L[0] = []
>>> L
[[]]
>>>
]]>
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