Learn
Using Dictionaries
Get an Invalid Key
Let’s say we have our dictionary of building heights from the last exercise:
building_heights = {"Burj Khalifa": 828, "Shanghai Tower": 632, "Abraj Al Bait": 601, "Ping An": 599, "Lotte World Tower": 554.5, "One World Trade": 541.3}
What if we wanted to know the height of the Landmark 81 in Ho Chi Minh City? We could try:
print(building_heights["Landmark 81"])
But "Landmark 81"
does not exist as a key in the building_heights
dictionary! So this will throw a KeyError:
KeyError: 'Landmark 81'
One way to avoid this error is to first check if the key exists in the dictionary:
key_to_check = "Landmark 81" if key_to_check in building_heights: print(building_heights["Landmark 81"])
This will not throw an error, because key_to_check in building_heights
will return False
, and so we never try to access the key.
Instructions
1.
Run the code. It should throw a KeyError
! "energy"
does not exist as one of the elements.
2.
Add the key "energy"
to the zodiac_elements
. It should map to a value of "Not a Zodiac element"
.
Run the code. Did this resolve the KeyError
?