Dictionaries

Main idea

Dictionary maps keys to values.

Tip

Use get() for safe read.

Watch out

KeyError from missing key access.

Read this next

You will study Dictionaries. It belongs to the Data Mastery phase.

Remember this:
Dictionary maps keys to values.

Practice step by step. Do not rush. Each run should show you something new.

Tip:
Use get() for safe read.

Avoid this:
KeyError from missing key access.

Your challenge:
Build student marks dictionary and print average.

Go to the challenge lab below. Fix errors until the output looks right. Then press the green button to complete the topic.

Example code

Copy this example if it helps. Change it so it matches Dictionaries.

# Topic: Dictionaries
def main():
    sample = "edit me"
    # TODO: apply Dictionaries concept here
    result = sample
    print("Result:", result)

if __name__ == "__main__":
    main()

Challenge

Build student marks dictionary and print average.

Before you can finish: your output should include at least 10 characters; at least 1 non-empty line(s); no crash traceback—fix errors until the program runs cleanly.

Use Run. Read the output. Change your code until the task is done.

Starter reference

# Challenge starter for Dictionaries
def solve():
    # Write your solution here
    pass

print("Update solve() and run")

Your code

The first Run may load Python in your browser (one-time). Later runs are faster.

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