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Associative array/Creation: Difference between revisions
Merge two entrys of Python
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(Merge two entrys of Python) |
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Numerous methods exist for the mapping type http://docs.python.org/lib/typesmapping.html
# empty dictionary▼
d = {}▼
d['spam'] = 1▼
d['eggs'] = 2 ▼
# dictionaries with two keys▼
d1 = {'spam': 1, 'eggs': 2}▼
d2 = dict(spam=1, eggs=2)▼
# dictionaries from tuple list▼
d1 = dict([('spam', 1), ('eggs', 2)])▼
d2 = dict(zip(['spam', 'eggs'], [1, 2]))▼
# iterating over keys▼
for key in d:▼
print key, d[key]▼
# iterating over (key, value) pairs▼
for key, value in d.iteritems():▼
print key, value▼
Create a generic mapping function that applys a callback to elements in a list:▼
==[[Ruby]]==
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@hash->{'key1', 'three'} = ('val1', -238.83);
▲ # empty dictionary
▲ d = {}
▲ d['spam'] = 1
▲ d['eggs'] = 2
▲ # dictionaries with two keys
▲ d1 = {'spam': 1, 'eggs': 2}
▲ d2 = dict(spam=1, eggs=2)
▲ # dictionaries from tuple list
▲ d1 = dict([('spam', 1), ('eggs', 2)])
▲ d2 = dict(zip(['spam', 'eggs'], [1, 2]))
▲ # iterating over keys
▲ for key in d:
▲ print key, d[key]
▲ # iterating over (key, value) pairs
▲ for key, value in d.iteritems():
▲ print key, value
▲Create a generic mapping function that applys a callback to elements in a list:
==[[Smalltalk]]==
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