Hash tables and hash maps in python | Edureka
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The document explains hash tables and hashmaps in Python, detailing how to create dictionaries using curly braces or the dict() function, and introduces nested dictionaries. It outlines operations on hash tables, including accessing, updating, and deleting entries. Additionally, it discusses converting dictionaries into pandas dataframes.
Hash tables and hash maps in python | Edureka
- 2. • What is a Hash Table or a Hashmap in Python? • Creating Dictionaries • Nested Dictionaries ❖Accessing Items ❖Updating Values • Performing Operation oh Hash Tables ❖Deleting Entries • Converting Dictionary into a Dataframe www.edureka.co/python
- 3. What is a Hash Table or Hashmap in Python? www.edureka.co/python
- 4. What is a Hash Table or Hashmap in Python? www.edureka.co/python Index Value 0 Value1 1 Value2 2 Value3 Key1 Key2 Key3 Hash Function Hash table or a Hashmap is a type of data structure that maps keys to its value pairs
- 6. www.edureka.co/python Creating Dictionaries Using curly Braces Dictionary in Python is represented using curly braces. Therefore, to create a dictionary, you can make use of the curly braces. Using dict() Python provides dict() function that can be used to create dictionaries by passing the key-value pairs as parameters to it.
- 8. www.edureka.co/python Nested Dictionaries Nested dictionaries are basically dictionaries that lie within other dictionaries Index Value 0 1 Value2 2 Value3 Key1 Key2 Key3 Hash Function 0.1 Value1.1 0.2 Value1.2
- 9. Performing Operations on Hash Tables www.edureka.co/python • Accessing Items • Updating Values • Deleting Entries
- 10. Copyright © 2017, edureka and/or its affiliates. All rights reserved. www.edureka.co
- 11. www.edureka.co/python Performing Operations on Hash Tables Accessing Items Index Value 0 1 2 Key1 Key2 Key3 Hash Function Value1 Value3 Value2 Values
- 12. www.edureka.co/python Performing Operations on Hash Tables Updating Values Dictionaries are mutable data types and you can update them as and when required. Index Value 0 1 Value2 2 Value3 Key1 Key2 Key3 Hash Function Value1
- 13. www.edureka.co/python Performing Operations on Hash Tables Deleting Entries Index Value 0 Value1 1 Value2 2 Value3 Key1 Key2 Key3 Hash Function Index Value 0 Value1 1 Value2
- 14. Converting Dictionary into a Dataframe www.edureka.co/python
- 15. www.edureka.co/python DataFrame is a 2-D (2-dimensional) data structure that consists of columns of various types. It is very similar to a Python dictionary and you can even convert a dictionary into a pandas dataframe. Converting Dictionary into a Dataframe