Example 1: ordered dictionary python
from collections import OrderedDict
x = OrderedDict(a=1, b=2, c=3)
Example 2: python Ordered dict to dict
>>> from collections import OrderedDict
>>> dict(OrderedDict([('method', 'constant'), ('data', '1.225')]))
{'data': '1.225', 'method': 'constant'}
Example 3: how to make an ordered dictionary in python
from collections import OrderedDict
print("Before:\n")
od = OrderedDict()
od['a'] = 1
od['b'] = 2
od['c'] = 3
od['d'] = 4
for key, value in od.items():
print(key, value)
print("\nAfter:\n")
od['c'] = 5
for key, value in od.items():
print(key, value)
"""
Ouptut:
Before:
('a', 1)
('b', 2)
('c', 3)
('d', 4)
After:
('a', 1)
('b', 2)
('c', 5)
('d', 4)
"""
Example 4: python ordereddict
>>>
>>> d = {'banana': 3, 'apple': 4, 'pear': 1, 'orange': 2}
>>>
>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])
>>>
>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])
>>>
>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])
Example 5: ordered dictionary python
import collections
print 'Regular dictionary:'
d = {}
d['a'] = 'A'
d['b'] = 'B'
d['c'] = 'C'
d['d'] = 'D'
d['e'] = 'E'
for k, v in d.items():
print k, v
print '\nOrderedDict:'
d = collections.OrderedDict()
d['a'] = 'A'
d['b'] = 'B'
d['c'] = 'C'
d['d'] = 'D'
d['e'] = 'E'
for k, v in d.items():
print k, v
Example 6: python counter
>>> c = Counter(a=4, b=2, c=0, d=-2)
>>> d = Counter(a=1, b=2, c=3, d=4)
>>> c.subtract(d)
>>> c
Counter({'a': 3, 'b': 0, 'c': -3, 'd': -6})