In [1]:

    

import collections


    

In [2]:

    

od = collections.OrderedDict()


    

In [3]:

    

od['k1'] = 1
od['k2'] = 2
od['k3'] = 3


    

In [4]:

    

print(od)


    

    




OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)])

In [5]:

    

print(collections.OrderedDict(k1=1, k2=2, k3=3))
print(collections.OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)]))
print(collections.OrderedDict((['k1', 1], ['k2', 2], ['k3', 3])))


    

    




OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)])
OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)])
OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)])

In [6]:

    

print(collections.OrderedDict({'k1': 1, 'k2': 2, 'k3': 3}))


    

    




OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)])

In [7]:

    

print(issubclass(collections.OrderedDict, dict))


    

    




True

In [8]:

    

print(od['k1'])


    

    




1

In [9]:

    

od['k2'] = 200
print(od)


    

    




OrderedDict([('k1', 1), ('k2', 200), ('k3', 3)])

In [10]:

    

od.update(k4=4, k5=5)
print(od)


    

    




OrderedDict([('k1', 1), ('k2', 200), ('k3', 3), ('k4', 4), ('k5', 5)])

In [11]:

    

del od['k4'], od['k5']
print(od)


    

    




OrderedDict([('k1', 1), ('k2', 200), ('k3', 3)])

In [12]:

    

od.move_to_end('k1')
print(od)


    

    




OrderedDict([('k2', 200), ('k3', 3), ('k1', 1)])

In [13]:

    

od.move_to_end('k1', False)
print(od)


    

    




OrderedDict([('k1', 1), ('k2', 200), ('k3', 3)])

In [14]:

    

l = list(od.items())
print(l)


    

    




[('k1', 1), ('k2', 200), ('k3', 3)]

In [15]:

    

l.insert(1, ('kx', -1))
print(l)


    

    




[('k1', 1), ('kx', -1), ('k2', 200), ('k3', 3)]

In [16]:

    

od = collections.OrderedDict(l)
print(od)


    

    




OrderedDict([('k1', 1), ('kx', -1), ('k2', 200), ('k3', 3)])

In [17]:

    

l = list(od.items())
print(l)


    

    




[('k1', 1), ('kx', -1), ('k2', 200), ('k3', 3)]

In [18]:

    

l[0], l[2] = l[2], l[0]
print(l)


    

    




[('k2', 200), ('kx', -1), ('k1', 1), ('k3', 3)]

In [19]:

    

od = collections.OrderedDict(l)
print(od)


    

    




OrderedDict([('k2', 200), ('kx', -1), ('k1', 1), ('k3', 3)])

In [20]:

    

l = list(od.items())
k = list(od.keys())
print(k)


    

    




['k2', 'kx', 'k1', 'k3']

In [21]:

    

print(k.index('kx'))


    

    




1

In [22]:

    

l[k.index('kx')], l[k.index('k3')] = l[k.index('k3')], l[k.index('kx')]
print(l)


    

    




[('k2', 200), ('k3', 3), ('k1', 1), ('kx', -1)]

In [23]:

    

od = collections.OrderedDict(l)
print(od)


    

    




OrderedDict([('k2', 200), ('k3', 3), ('k1', 1), ('kx', -1)])

In [24]:

    

od_sorted_key = collections.OrderedDict(
    sorted(od.items(), key=lambda x: x[0])
)
print(od_sorted_key)


    

    




OrderedDict([('k1', 1), ('k2', 200), ('k3', 3), ('kx', -1)])

In [25]:

    

od_sorted_value = collections.OrderedDict(
    sorted(od.items(), key=lambda x: x[1], reverse=True)
)
print(od_sorted_value)


    

    




OrderedDict([('k2', 200), ('k3', 3), ('k1', 1), ('kx', -1)])