How to use Dictionary Comprehension

List Comprehension

Inside the comprehension, we get to set the new_key, the new_value, and we get to loop through items in a list.
So any sort of iterable; a list, a range, a string, anything you want.

#Creating a dictionary using this shortened syntax.
new_dict = {new_key: new_value for item in list}

We could also create a new dictionary based on the values in an existing dictionary.
We could take that dictionary and then get hold of all of the items inside that dictionary, and then split it into a key and a value.

#Keyword Method
new_dict = {new_key: new_value for (key,value) in dict.items()}

Conditional Dictionary Comprehension

new_dict = {new_key: new_value for (key,value) in dict.items() if test}

names = ['Alex', 'Beth', 'Caroline', 'Dave', 'Eleanor', 'Freddie']
import random
students_scores = {student:random.randint(1, 100) for student in names}

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{'Alex': 80, 'Beth': 79, 'Caroline': 62, 'Dave': 67, 'Eleanor': 44, 'Freddie': 73}

names = ['Alex', 'Beth', 'Caroline', 'Dave', 'Eleanor', 'Freddie']
students_scores = {'Alex': 80, 'Beth': 79, 'Caroline': 62, 'Dave': 67, 'Eleanor': 44, 'Freddie': 73}
#passed_student = {student: students_scores[student] for student in students_scores if students_scores[student] >= 60}

#Angela's method
passed_student = {student:score for (student,score) in students_scores.items() if score >= 60}

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{'Alex': 80, 'Beth': 79, 'Caroline': 62, 'Dave': 67, 'Freddie': 73}