Dictionary is an unordered collection of key-value pairs.
Real word dictionaries are a good analogy to understand them: they contain a list of items(words), and each item has a key(the word) and a value(the word’s meaning).
It generally is used when we have a huge amount of data.
It is defined within braces, with each item being in the form of key: value pair. Syntax –
my_dict = {
"key1":"value1",
"key2":"value2",}
Tutorial on Dictionaries
For the time being, ignore the video after 4 minutes and 18 seconds. Don’t worry if you don’t understand the topics after 4 minutes and 18 seconds. You will learn that soon.
- The keys in a dictionary must always be unique and immutable.
- This is the reason dictionary keys can be String but not List.
- On the other hand, Values in a dictionary can be of any datatype and can be duplicated.
- Dictionary keys are case sensitive, same name but different cases of Key will be treated distinctly.
Example:
Class Sessions
1- Data Science Fundamentals
2- Problems Data Science Can Solve
3- The Data Science Process
4- What is Python?
5- Get Started with Google Colab
6- Comments in Python
7- Operators in Python
8- Variables in Python
9- Input and Output in Python
10- Data Structures & Data Types in Python
11- Strings
12- Introduction & Implementation of List in Python
13- Introduction & Implementation of Tuple in Python
14- Introduction & Implementation of Dictionary in Python
15- Inbuilt Functions
16- Define functions in Python
17- Methods in Python
18- Difference between functions and methods
19- Packages in Python
20- Python Notebook