Revision: 26928
Initial Code
Initial URL
Initial Description
Initial Title
Initial Tags
Initial Language
at May 17, 2010 06:33 by magicrebirth
Initial Code
# dicts to lists
dictionary = {'a': 1, 'b': 2, 'c': 3}
2dict_as_list = dictionary.items()
# dict_as_list now contains [('a', 1), ('b', 2), ('c', 3)]
# lists to dicts
dict_as_list = [['a', 1], ['b', 2], ['c', 3]]
dictionary = dict(dict_as_list)
# dictionary now contains {'a': 1, 'b': 2, 'c': 3}
# You can also combine this with the 'keyword arguments' method of creating a dict
dict_as_list = [['a', 1], ['b', 2], ['c', 3]]
dictionary = dict(dict_as_list, d=4, e=5)
# dictionary now contains {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}
Initial URL
Initial Description
Turning a dictionary into a list or an iterator is easy. To get a list of keys, you can just cast the dict into a list. It's cleaner, though to call .keys() on the dictionary to get a list of the keys, or .iterkeys() to get an iterator. Similarly, you can call .values() or .itervalues() to get a list or iterator of dictionary values. Remember though, that dicts are inherently unordered and so these values won't be in any meaningful order. To preserve both keys and values, you can turn a dict into a list or iterator of 2-item tuples by using .items() or .iteritems(). This is something that you'll probably do a lot, and isn't very exciting:
Initial Title
Dicts to Lists / Lists to Dicts
Initial Tags
list
Initial Language
Python