How to merge or concatenate dictionaries in Python · XXXX YYYY

How to merge or concatenate dictionaries in Python

Reference:

Python Program to Merge Dictionaries (with Examples)

Methods of merging dictionaries:

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the following content is copied from the reference page

#	method	code	output
1	update	dict_1 = {‘John': 15, ‘Rick': 10, ‘Misa' : 12 } dict_2 = {‘Bonnie': 18,'Rick': 20,'Matt' : 16 } dict_1.update(dict_2) print(dict_1)	{‘John': 15, ‘Rick': 20, ‘Misa': 12, ‘Bonnie': 18, ‘Matt': 16}
2	`**` operator	dict_1 = {‘John': 15, ‘Rick': 10, ‘Misa' : 12 } dict_2 = {‘Bonnie': 18,'Rick': 20,'Matt' : 16 } dict_3 = {``dict_1,``dict_2} print(dict_3)	{‘John': 15, ‘Rick': 20, ‘Misa': 12, ‘Bonnie': 18, ‘Matt': 16}
3	`**` operator	dict_1={‘John': 15, ‘Rick': 10, ‘Misa' : 12 } dict_2={‘Bonnie': 18,'Rick': 20,'Matt' : 16 } dict_3=dict(dict_1,`**`dict_2) print (dict_3)	{‘John': 15, ‘Rick': 20, ‘Misa': 12, ‘Bonnie': 18, ‘Matt': 16}
4	`**` operator	dict_1={‘John': 15, ‘Rick': 10, ‘Misa' : 12 } dict_2={‘Bonnie': 18,'Rick': 20,'Matt' : 16 } dict_3=dict(dict_2, `**`dict_1) print (dict_3)	{‘Bonnie': 18, ‘Rick': 10, ‘Matt': 16, ‘John': 15, ‘Misa': 12}
5	`collection.ChainMap()`	from collections import ChainMap dict_1={‘John': 15, ‘Rick': 10, ‘Misa' : 12 } dict_2={‘Bonnie': 18,'Rick': 20,'Matt' : 16 } dict_3 = ChainMap(dict_1, dict_2) print(dict_3) print(dict(dict_3))	ChainMap({‘John': 15, ‘Rick': 10, ‘Misa': 12}, {‘Bonnie': 18, ‘Rick': 20, ‘Matt': 16}) {‘Bonnie': 18, ‘Rick': 10, ‘Matt': 16, ‘John': 15, ‘Misa': 12}
6	`itertools.chain()`	import itertools dict_1={‘John': 15, ‘Rick': 10, ‘Misa': 12} dict_2={‘Bonnie': 18, ‘Rick': 20, ‘Matt': 16} dict_3=itertools.chain(dict_1.items(),dict_2.items()) print (dict_3) print(dict(dict_3))	`<itertools.chain object at 0x0000015CB1887588>` {‘John': 15, ‘Rick': 20, ‘Misa': 12, ‘Bonnie': 18, ‘Matt': 16}

dict_1 = {'John': 15, 'Rick': 10, 'Misa' : 12 }
dict_2 = {'Bonnie': 18,'Rick': 20,'Matt' : 16 }
dict_1.update(dict_2)
print(dict_1)
  

{'John': 15, 'Rick': 20, 'Misa': 12, 'Bonnie': 18, 'Matt': 16}

dict_1 = {'John': 15, 'Rick': 10, 'Misa' : 12 }
dict_2 = {'Bonnie': 18,'Rick': 20,'Matt' : 16 }
dict_3 = {**dict_1,**dict_2}
print(dict_3)
  

{'John': 15, 'Rick': 20, 'Misa': 12, 'Bonnie': 18, 'Matt': 16}

dict_1={'John': 15, 'Rick': 10, 'Misa' : 12 }
dict_2={'Bonnie': 18,'Rick': 20,'Matt' : 16 }
dict_3=dict(dict_1,**dict_2)
print (dict_3)
  

{'John': 15, 'Rick': 20, 'Misa': 12, 'Bonnie': 18, 'Matt': 16}

dict_1={'John': 15, 'Rick': 10, 'Misa' : 12 }
dict_2={'Bonnie': 18,'Rick': 20,'Matt' : 16 }
dict_3=dict(dict_2, **dict_1)
print (dict_3)
  

{'Bonnie': 18, 'Rick': 10, 'Matt': 16, 'John': 15, 'Misa': 12}

from collections import ChainMap
dict_1={'John': 15, 'Rick': 10, 'Misa' : 12 }
dict_2={'Bonnie': 18,'Rick': 20,'Matt' : 16 }
dict_3 = ChainMap(dict_1, dict_2)
print(dict_3)
print(dict(dict_3))
  

ChainMap({'John': 15, 'Rick': 10, 'Misa': 12}, {'Bonnie': 18, 'Rick': 20, 'Matt': 16})
{'Bonnie': 18, 'Rick': 10, 'Matt': 16, 'John': 15, 'Misa': 12}
  

import itertools
dict_1={'John': 15, 'Rick': 10, 'Misa': 12}
dict_2={'Bonnie': 18, 'Rick': 20, 'Matt': 16}
dict_3=itertools.chain(dict_1.items(),dict_2.items())
print (dict_3)
print(dict(dict_3))
  

<itertools.chain object at 0x0000022EAF4603C8>
{'John': 15, 'Rick': 20, 'Misa': 12, 'Bonnie': 18, 'Matt': 16}
  

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