Append two dictionaries so they don’t Overwrite Each Other
Below are some of the ways by which we can append two dictionaries in Python:
- Using the
update()
Method - Using the
**
Unpacking Operator - Using the
collections.ChainMap
Class - Using the
dict()
Constructor and Unpacking
Append Two Dictionaries Using the update()
Method
In this example, two dictionaries, `dict1` and `dict2`, are provided. The update() method is employed to merge the contents of `dict2` into a copy of `dict1`, resulting in `merged_dict`. If there are overlapping keys, values from `dict2` will overwrite corresponding values from `dict1`, and the final merged dictionary is printed.
Python3
# Sample dictionaries dict1 = { 'a' : 1 , 'b' : 2 } dict2 = { 'b' : 3 , 'c' : 4 } # Using update() method merged_dict = dict1.copy() merged_dict.update(dict2) print (merged_dict) |
{'a': 1, 'b': 3, 'c': 4}
Append Two Dictionaries Using the **
Unpacking Operator
In this example, two dictionaries, dict1
and dict2
, are provided. The ** unpacking operator is utilized to merge their contents into a new dictionary named merged_dict
. This concise approach combines the key-value pairs from both dictionaries, and if there are overlapping keys, the values from dict2
will overwrite the values from dict1
. The final merged dictionary is then printed.
Python3
# Sample dictionaries dict1 = { 'a' : 1 , 'b' : 2 } dict2 = { 'b' : 3 , 'c' : 4 } # Using ** unpacking operator merged_dict = { * * dict1, * * dict2} print (merged_dict) |
{'a': 1, 'b': 3, 'c': 4}
Append Two Dictionaries Using the collections.ChainMap
Class
In this example, the collections
module’s ChainMap
is utilized to merge two dictionaries, dict1
and dict2
. The ChainMap
class efficiently combines the dictionaries, creating a view that allows access to the keys and values from both dictionaries as if they were a single dictionary. The resulting merged_dict
is then converted into a regular dictionary using dict()
, and the combined key-value pairs are printed.
Python3
from collections import ChainMap # Sample dictionaries dict1 = { 'a' : 1 , 'e' : 2 } dict2 = { 'b' : 3 , 'c' : 4 } # Using ChainMap merged_dict = dict (ChainMap(dict1, dict2)) print (merged_dict) |
{'b': 3, 'c': 4, 'a': 1, 'e': 2}
Append Two Dictionaries Using the dict()
Constructor and Unpacking
In this example, the dict()
constructor and the ** unpacking operator are employed to merge two dictionaries, dict1
and dict2
. The resulting merged_dict
contains the combined key-value pairs from both dictionaries. If there are overlapping keys, the values from dict2
will overwrite the values from dict1
.
Python3
# Sample dictionaries dict1 = { 'a' : 1 , 'b' : 2 } dict2 = { 'b' : 3 , 'c' : 4 } # Using dict() constructor and unpacking merged_dict = dict (dict1, * * dict2) print (merged_dict) |
{'a': 1, 'b': 3, 'c': 4}
Merge Dictionaries without Overwriting in Python
Merging dictionaries in Python is a common operation. In this article, we will see how we can append two dictionaries so that they don’t overwrite each other in Python.