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< symmetric_set_difference

set_men_not_hungry_old_poor >

Main Page → Exercises → Python → Solve an Exercise

set_concepts

Language/Type: Python collections set

Answer the following questions about sets:

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A list has every function that a set has, and more. So why would you use a set rather than a list? (Check all that apply.)
Using a collection with fewer capabilities builds character and makes your parents proud of you. You do not have enough memory to use a list. Sets are more backward-compatible with older versions of Python. You want to avoid duplicates. You want to be able to search the collection quickly. You don't need the missing functions for the program you are writing, just the ability to add/remove/search. (order shuffled)
A set doesn't have the indexes that a list has. How do you examine every element of a set?
Use a for loop over a range, examining each index i. Convert the set into a list, then use a for loop over the list. Use a for-each loop over the values in the set. Use [] on each value one at a time. Call the examine() method on the set. (order shuffled)
How do you check whether a set contains a given value?
Print the set and read the output. Add the value, and see if an error is raised. Use the [] operator on the set. Call the exists() function on the set. Use the keyword 'in' to test for membership. (order shuffled)
What happens if you try to add a value to a set but that value is already present in the set?
An error message prints out on the console saying, "bad value." An error is raised. Nothing happens; the new value is not added. The value is added, but the set is converted into a list. The new value is added; it will now occur twice in the set. (order shuffled)
How do you merge the contents of two sets?
`set1 \| set2` `set1 ^ set2` `set1 + set2` `set1 & set2` `set1.add(set2)` (order shuffled)
How do you find out what elements are stored in common between two sets?
`set1 \| set2` `set1 + set2` `set1.add(set2)` `set1 & set2` `set1 ^ set2` (order shuffled)

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Main Page → Exercises → Python → Solve an Exercise

set_concepts