Python Collections Tutorial | Edureka
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The document provides an overview of collection data types in Python including lists, tuples, sets, and dictionaries. It also introduces specialized collection types from the collections module such as defaultdict, namedtuple, deque, ChainMap, Counter, and OrderedDict, explaining their functionalities. Each collection type is briefly described with examples demonstrating its use in Python programming.
![deque
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deque pronounced as ‘deck’ is an optimised list to
perform insertion and deletion easily.
Deque( [ ‘e’ , ’d’ , ’u’ , ’r’ ,’e’ , ’k’ , ’a’ ] )](https://image.slidesharecdn.com/collectionsinpython-190912121956/85/Python-Collections-Tutorial-Edureka-10-320.jpg)
![Chainmap
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Chainmap is a dictionary like class for creating a single
view of multiple mappings.
A = { 1: ‘edureka’ , 2: ‘python’}
B = { 3: ‘data science’ , 4: ‘AI’}
[ {1: ‘edureka’ , 2: ‘python’} , {3: ‘data science’, 4: ‘AI’} ]](https://image.slidesharecdn.com/collectionsinpython-190912121956/85/Python-Collections-Tutorial-Edureka-11-320.jpg)
![Counter
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Counter is a dictionary subclass for counting hashable
objects..
A = [1,2,1,2,1,2,3,4,5,6,7,2,1,2]
Count = Counter(a)
Counter( {1:4 , 2:5 , 3:1 , 4:1 , 5:1 , 6:1, 7:1})](https://image.slidesharecdn.com/collectionsinpython-190912121956/85/Python-Collections-Tutorial-Edureka-12-320.jpg)
![OrderedDict
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OrderedDict is dictionary subclass which remembers the
order in which the entries were done.
od = collections.OrderedDict()
od[‘a’] = 2
od[’b’] = 1
od[‘c’] = 3
Print(od)
OrderedDIct( { [ (a ,2) , (b, 1 ), (c ,3 ) ] )](https://image.slidesharecdn.com/collectionsinpython-190912121956/85/Python-Collections-Tutorial-Edureka-13-320.jpg)
![defaultdict
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defaultdict is a dictionary subclass which calls a factory
function to supply missing values.
D = defaultdict(int)
D[‘edureka’] = 1
D[‘python’] = 2
Print(D[‘java’]
Output : 0](https://image.slidesharecdn.com/collectionsinpython-190912121956/85/Python-Collections-Tutorial-Edureka-14-320.jpg)
Python Collections Tutorial | Edureka
- 1. Copyright © 2017, edureka and/or its affiliates. All rights reserved.
- 2. What Are Collections In Python? What Is A Collections Module In Python? www.edureka.co/python Specialised Collections Data Types
- 4. www.edureka.co/python There are four collection data types in python which are used to store collections of data. LISTS TUPLES SETS DICTIONARY
- 5. What Is A Collections Module In Python? www.edureka.co/python
- 6. What Is A Collection Module In Python? www.edureka.co/python COLLECTIONS Specialised Collection data structures
- 9. namedtuple() www.edureka.co/python namedtuple() returns a tuple with a named value for each element in the tuple. Details = (name= ‘edureka’ , course=‘python’ , course2= ‘data science’)
- 10. deque www.edureka.co/python deque pronounced as ‘deck’ is an optimised list to perform insertion and deletion easily. Deque( [ ‘e’ , ’d’ , ’u’ , ’r’ ,’e’ , ’k’ , ’a’ ] )
- 11. Chainmap www.edureka.co/python Chainmap is a dictionary like class for creating a single view of multiple mappings. A = { 1: ‘edureka’ , 2: ‘python’} B = { 3: ‘data science’ , 4: ‘AI’} [ {1: ‘edureka’ , 2: ‘python’} , {3: ‘data science’, 4: ‘AI’} ]
- 12. Counter www.edureka.co/python Counter is a dictionary subclass for counting hashable objects.. A = [1,2,1,2,1,2,3,4,5,6,7,2,1,2] Count = Counter(a) Counter( {1:4 , 2:5 , 3:1 , 4:1 , 5:1 , 6:1, 7:1})
- 13. OrderedDict www.edureka.co/python OrderedDict is dictionary subclass which remembers the order in which the entries were done. od = collections.OrderedDict() od[‘a’] = 2 od[’b’] = 1 od[‘c’] = 3 Print(od) OrderedDIct( { [ (a ,2) , (b, 1 ), (c ,3 ) ] )
- 14. defaultdict www.edureka.co/python defaultdict is a dictionary subclass which calls a factory function to supply missing values. D = defaultdict(int) D[‘edureka’] = 1 D[‘python’] = 2 Print(D[‘java’] Output : 0
- 15. UserDict, UserList, UserString www.edureka.co/python UserDict is a wrapper around dictionary objects for easier dictionary sub-classing. UserList is a wrapper around list objects for easier List sub-classing. UserString is a wrapper around string objects for easier string sub-classing.
- 16. Copyright © 2017, edureka and/or its affiliates. All rights reserved. www.edureka.co