Exercises

Exercise 14

Save your code in your Python folder and call it exercise14.

I want to use a dictionary to store the grades of different students. I want you to help me creating, accessing, modfying, adding & removing grades.

Here are the grades of my students:

Name	Grades
"Alice"	92
"Bob"	85
"Charlie"	78
"David"	95
"Eve"	88

Create a dictionary and initialise it with the combination of names and grades above.
Print the grade of Alice and the grade of Charlie.
Add a new student Franck to the dictionary. His grade is 89.
Change the grade of Bob, his grade is 87.
Eve just left the school, remove her from the dictionary.
Using for and in, display all the students grade.

Help

To create a dictionary: dico = {"a": 1, "b":2}.
To get an element using the key a: dico["a"].
To add a pair key/value: dico["c"] = 3.
To modify a value: dico["a"] = "hello".
To remove a key/value: del dico["a"].

To display a dictionary:

🐍 Python Script

for key in dico:
    print(key, ":", dico[key])

Exercise 15

Save your code in your Python folder and call it exercise15.

Create a Python program that takes a text as input (a string of words separated by spaces) and counts the frequency of each word. Then, store the word frequencies in a dictionary and print out the result.

Example

🐍 Python Script

>>> %Run exercise15.py
give me some words seperated by space: this is a simple example this is a test
'this': 2
'is': 2
'a': 2
'simple': 1
'example': 1
'test': 1
>>>

Help

To split text into words: words = text.split(" ").
You need to initialize an empty dictionary.
Then you need to create a for loop where you check each word in the list words. If the word is already in the dictionary, you need to increase the value by one. If the word is not yet in the dictionary, you need to add it, with the word as a key and 1 as a value.