Manipulate and Merge Muti Lists into A Single Standalone List Using ChainMap, ItemGetter, Sorted
List or array data type is a key component applied to many fields in Python and data science, such as machine learning, deep learning, automation etc. In some cases, we might have multi lists stored on different locations, but in fact they share some common grounds. In this article, I would briefly walk through how to merge them into one list using 3 methods which are ChainMap, ItemGetter and Sort.
List or array data type is a key component applied to many fields in Python and data science, such as machine learning, deep learning, automation etc. In some cases, we might have multi lists stored on different locations, but in fact they share some common grounds. In this article, I would briefly walk through how to merge them into one list using 3 methods which are ChainMap, ItemGetter and Sort.
Table of Contents: Merge Muti Lists into A Single Standalone List Using ChainMap, ItemGetter and Sorted
- ItemGetter and Sorted
- ChainMap from Collection
- Manipulate and Merge Multi Lists using Sorted, ItemGetter and ChainMap
- Full Python scripts of merging Muti Lists into A Single Standalone List Using ChainMap, ItemGetter and Sort
ItemGetter and Sorted
The Itemgetter can be used instead of the lambda function to achieve similar functionality. Outputs in the same way as sorted() and lambda, but has different internal implementation. It takes the keys of dictionaries and converts them into tuples. It reduces overhead and is faster and more efficient. The “operator” module has to be imported for its work. The code is explained below
- Performance: itemgetter performs better than lambda functions in the context of time.
- Concise: : itemgetter looks more concise when accessing multiple values than lambda functions.
from operator import itemgetter# Initializing list of dictionarieslist = [{"name": "Andy", "job": software engineer}, {"name": "Judy", "job": AI engineer}, {"name": "Louis", "age": automation engineer}]# using sorted and itemgetter to print list sorted by jobprint "The list printed sorting by age: "print sorted(list, key=itemgetter('job'))ChaimMap from Collection
Python contains a container called “ChainMap” which encapsulates many dictionaries into one unit. ChainMap is member of module “collections“.
from collections import ChainMap
d1 = {'a': 1, 'b': 2}
d2 = {'c': 3, 'd': 4}
d3 = {'e': 5, 'f': 6}
Manipulate and Merge Multi Lists using Sorted, ItemGetter and ChainMap
mergedLists = groupby(sorted(listA+ listB, key=itemgetter("ID")), itemgetter("ID"))result = [dict(ChainMap(*g)) for k, g in mergedLists]Full Python scripts of merging Muti Lists into A Single Standalone List Using ChainMap, ItemGetter and Sort
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