Hands-on exercise – Dictionaries

Put the lesson Dictionaries into practice by writing a program yourself.

Exercise field

Look up melting points

The problem

The dictionary below maps metals to their melting points in °C. Add tungsten, which melts at 3422 °C.

Then look values up by name, count the entries, and safely check for a metal that isn't recorded.

Your program should

Add the key "Tungsten" with the value 3422.
Print Tungsten: 3422 °C by looking the value up in the dictionary.
Print Metals recorded: 4 using len().
Print Gold: not recorded using get() with a default value.

Expected output

Tungsten: 3422 °C
Metals recorded: 4
Gold: not recorded

Your solution

Write your program below and press Run. Each run is checked against the expected output.

main.py

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Output

Press Run to see what your program prints.

Need help?

One possible solution. Other programs that print the same output are correct too.

solution.py

melting_points = {"Aluminium": 660, "Copper": 1085, "Iron": 1538}melting_points["Tungsten"] = 3422print(f"Tungsten: {melting_points['Tungsten']} °C")print(f"Metals recorded: {len(melting_points)}")print("Gold:", melting_points.get("Gold", "not recorded"))

Output

Tungsten: 3422 °C Metals recorded: 4 Gold: not recorded