COMP 110 JUNE 2-6
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Last updated 4:12 AM on 6/4/25
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21 Terms
1
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Why avoid in with large lists?
Must scan every item (slow for big lists).
2
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Lists allow duplicates?
Yes.
3
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Lists maintain order?
Yes, by index (0, 1, 2...).
4
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Sets allow duplicates?
No, auto-removed.
5
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How to add to a set?
my_set.add(item).
6
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Empty set syntax?
set() (not {}).
7
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Why use sets over lists?
Faster membership checks.
8
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How to add/update a key-value pair?
my_dict["key"] = value.
9
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What happens to duplicate keys?
Last value wins ({"a":1, "a":2} → {"a":2}).
10
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Safe way to check keys?
"key" in my_dict or .get(key, default).
11
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How to remove a key?
.pop(key) or del my_dict["key"].
12
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Dictionary keys changeable?
No (must be strings, numbers, tuples).
13
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Empty dict syntax?
{} or dict().
14
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How to loop key-value pairs?
for key, value in my_dict.items():.
15
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{1,2,2} becomes?
{1,2}.
16
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len({"a":1, "b":2})?
2
17
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What does for x in my_dict: loop over?
The keys (use my_dict[x] to get values).
18
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Error for missing keys?
KeyError (use .get() to avoid).
19
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pop() missing key?
Raises KeyError (add default: .pop(key, None)).
20
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What does "zero-based" mean for lists?
First item is at index 0 (not 1).
21
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How are lists sequential?
Items keep their order (index 0 → 1 → 2...).
Note 
Flashcards (57)