Term
| What happens if you multiply a string in Python, e.g. "'ABC' * 3"? |
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Definition
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Term
| 2.Name and present an example of two string methods used to test the content of a string. |
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Definition
isupper()
islower()
isalpha()
isdigit() |
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Term
| 3.Name and present an example of two string methods used to search the content of a string. |
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Definition
"in" comparison operator
startswith('sub')
endswith('sub')
count('sub') |
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Term
| 4.Name and present an example of two string methods used to manipulate the content of a string. |
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Definition
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Term
| 5.Write one line of Python code which turns a string into uppercase and strips whitespace from both ends. |
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Definition
| string = myString.upper().strip() |
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Term
| 6.What are some of the names that dictionaries are known by in other languages? |
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Definition
associative arrays
hash tables
maps |
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Term
| 7.How do dictionaries differ from lists? |
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Definition
- items in a list identified by order index
-items in dictionary are arranged by key which is not ordered
(key is a label or name and has an associated value (key-value pair). Usually a string |
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Term
| 8.What happens if you try to refer to a key that does not exist in a dictionary? |
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Definition
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Term
| 9.Name and present an example of two dictionary methods. |
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Definition
key() - return list of all keys in dictionary
values() - return list of all values in dictionary
items() - list of tuples of all key-value pairs in dictionary
clear() -removes all items from dictionary |
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Term
| 10.What is a set, and how does it differ from a list and a dictionary? |
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Definition
a data structure that contains an unordered and unindexed collection of unique values, similar to mathematical concept of a set
No key (dictionary) and no index (list) |
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Term
| 11.What does the union of two sets contain, and what does the intersection of two sets contain? |
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Definition
combines both and keeps unique values
set A{1,2,3,4} set B {2,4,6,8}
Union = {1,2,3,4,6,8}
Intersection = {2,4} |
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Term
| 12.Show with examples how curly braces ("{" and "}") can be used to create both dictionaries and sets. |
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Definition
Curly brackets will create a set if you don't specify keys, and a dictionary if you do.
set1{'rock,'scissors','paper'}
dictionary1{'Rachel':'rock', 'Kim':'scissors', 'Jay':'paper'} |
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Term
| 13.Why are sets not supported in many languages? |
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Definition
| only useful in fairly specific situations and most of their functionality can be achieved using other data structures |
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