The document discusses dictionaries in Python. It explains that dictionaries consist of keys and values, with keys typically represented as strings. It provides examples of creating dictionaries and performing common dictionary operations like printing values, deleting keys/values, printing keys, and adding new key-value pairs. The document also discusses using dictionaries with loops and lists, including an example of a list containing multiple dictionaries.

1. AI Club
Python with AI - I
Dictionaries

2. • A dictionary consists of two things (a) keys (b) values
Dictionaries in python

3. • A dictionary consists of two things (a) keys (b) values
• Use strings to represent keys
Dictionaries in python

4. • A dictionary consists of two things (a) keys (b) values
• Use strings to represent keys
• Values can be anything
Dictionaries in python

5. • A dictionary consists of two things (a) keys (b) values
• Use strings to represent keys
• Values can be anything
• There are many ways to create a dictionary, we will look at one way
to do it:
Dictionaries in python

6. • A dictionary consists of two things (a) keys (b) values
• Use strings to represent keys
• Values can be anything
Dictionaries in python

7. Print the entire dictionary
• Print(my_dict)
• Please inspect the format in which it is printed.
• Where do the : symbols show up?

8. • Print(my_dict)
• Please inspect the format in which it is printed.
• Where do the colon (:) symbols show up?
• Where do the commas (,) show up?
Print the entire dictionary

9. • Create a dictionary, where the keys are one, two and the
corresponding values are 1 and 2
Exercise

10. • Create a dictionary, where the keys are one, two and the
corresponding values are 1 and 2
• Create a dictionary, where the keys are aiclub, PA1, M1 and the
corresponding values are website, python class, AI class.
Exercise

11. Dictionaries in python
• Print a value in a dictionary

12. • Print values of the first dictionary you created
• Print value corresponding to the key one
• Print value corresponding to the key two
Exercise

13. • Print values of the first dictionary you created
• Print value corresponding to the key one
• Print value corresponding to the key two
• Print values of the second dictionary you created
• Print value corresponding to the key aiclub
• Print value corresponding to the key M1
• Print value corresponding to the key PA1
Exercise

14. Dictionaries in python
• Print a value in a dictionary
• Delete a value in a dictionary

15. • Delete and print values of new dictionaries
• For the first dictionary
• Delete the value corresponding to the key one
• Print the value of dictionary
• For the second dictionary
• Delete the value corresponding to the key aiclub
• Print the value of dictionary
Exercise

16. Dictionaries in python
• Print a value in a dictionary
• Delete a value in a dictionary
• Print all keys of a dictionary

17. • Instead of printing the entire dictionary, please print only the keys of
the two dictionaries you created
Exercise

18. Dictionaries in python
• Print a value in a dictionary
• Delete a value in a dictionary
• Print all keys of a dictionary
• Add values to a dictionary

19. • Add the keys that you deleted from the 2 dictionaries back
• Print the two dictionaries
Exercise

20. loops and dictionaries – use together
• Loops - recap
• The for loop is of the following form.
• The range indicates the number of times a statement will be implemented.
• There is a colon value to indicate the start of for loop.
• The code below is executed many times. The number of times it gets executed
depends on the values specified in range.
• Note that the code below the for statement is indented.

21. Loops - recap
• The for loop is of the following form.
• Try different values inside the brackets of range
• Note that everything with indentation below for loop is executed as a
part of the loop.

22. • Exercise
a) Create a random number in the limits 0 and 10 using a random number
generator
Loops and Dictionaries

23. • Exercise
a) Create a random number in the limits 0 and 10 using a random number
generator
b) Create a list of length 10 using the random number generator (pick any
limits) – please use a loop
Loops and Dictionaries

24. Loops and Dictionaries
• Exercise
a) Create a random number in the limits 0 and 10 using a random number
generator
b) Create a list of length 10 using the random number generator (pick any
limits) – please use a loop
c) Now create a dictionary using the values of the list as keys and the
corresponding values for each key can be another random number (pick
any limits).

25. • A list holds ordered collection of items.
• And item can be a string or a number
Lists - recap

26. Lists - recap
• A list holds ordered collection of items.
• And item can be a string or a number
• An item can be a dictionary too

27. • Create a dictionary dict_1 with keys one, two, three and values 1, 2
and 3
• Create a dictionary dict_2 with keys one, two and three and values I,
II, III
List of dictionaries - Exercise

28. • Create a dictionary dict_1 with keys one, two, three and values 1, 2
and 3
• Create a dictionary dict_2 with keys one, two and three and values I,
II, III
• Create a list with these two dictionaries: list_dict = [dict_1, dict_2]
List of dictionaries - Exercise

29. • Create a dictionary dict_1 with keys one, two, three and values 1, 2
and 3
• Create a dictionary dict_2 with keys one, two and three and values I,
II, III
• Create a list with these two dictionaries: list_dict = [dict_1, dict_2]
• Print the value corresponding to the key one of first dictionary dict_1
from the list list_dict
List of dictionaries - Exercise

30. • Create a dictionary dict_1 with keys one, two, three and values 1, 2
and 3
• Create a dictionary dict_2 with keys one, two and three and values I,
II, III
• Create a list with these two dictionaries: list_dict = [dict_1, dict_2]
• Print the value corresponding to the key one of first dictionary dict_1
from the list list_dict
• Print the value corresponding to the key one of second dictionary
dict_2 from the list list_dict
List of dictionaries - Exercise

31. THANK YOU
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