PYTHON

python OrderedDict

# Dictonary which stores order of data insertion like a queue

from collections import OrderedDict

#initialization
od = OrderedDict()
# or
od = OrderedDict({'a':1})

#Storing data from small to big values (not keys)
# Sorted with value, then key

#Adding Data
od['a'] = 1
od['d'] = 3
od['e'] = 7
od['f'] = 1
od['c'] = 7
od['b'] = 5

#Get all keys
od.keys()

#Get all key & value as list
od.items()

# Move an item to end
od.move_to_end('a', last=True)	#Default last value = True

# Move an item to Start
od.move_to_end('a', last=False)


#Removing Data with key
del od['c']
od.pop('c')	#Also returns the value

#Removing Top Element
od.popitem(last = False)	#also return key/value pair

#Removing Bottom Element
od.popitem(last = True)		#also return key/value pair

ordered dictionary python

from collections import OrderedDict

# Remembers the order the keys are added!
x = OrderedDict(a=1, b=2, c=3)

ordered dictionary python

>>> # regular unsorted dictionary
>>> d = {'banana': 3, 'apple': 4, 'pear': 1, 'orange': 2}

>>> # dictionary sorted by key
>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])

>>> # dictionary sorted by value
>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])

>>> # dictionary sorted by length of the key string
>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])

python ordereddict

>>> # regular unsorted dictionary
>>> d = {'banana': 3, 'apple': 4, 'pear': 1, 'orange': 2}

>>> # dictionary sorted by key
>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])

>>> # dictionary sorted by value
>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])

>>> # dictionary sorted by length of the key string
>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])

ordered dictionary

# ordered dictionary
#Regular Dictionary
d = {'apple':1, 'oranges':2, 'bananas':3}
d['grapes'] = 4
print(d)

#Output:
# {'apple': 1, 'bananas': 3, 'grapes': 4, 'oranges': 2}

#Ordered Dictionary
from collections import OrderedDict
d = OrderedDict({'apple':1, 'oranges':2, 'bananas':3})
d['grapes'] = 4
print(d)

# OrderedDict([('apple', 1), ('oranges', 2), ('bananas', 3), ('grapes', 4)])

Ordered Dictionary

import collections    
d1=collections.OrderedDict()    
d1['A']=10    
d1['C']=12    
d1['B']=11    
d1['D']=13    
    
for k,v in d1.items():    
    print (k,v) 

#Output:
A 10
C 12
B 11
D 13