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Questions and Answers
What is a common method for adding an item to the end of a list?
What is a common method for adding an item to the end of a list?
What is the main difference between a set and a list?
What is the main difference between a set and a list?
What is the purpose of the keys() method in a dictionary?
What is the purpose of the keys() method in a dictionary?
What is a characteristic of strings in Python?
What is a characteristic of strings in Python?
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What is the purpose of the tuple() function?
What is the purpose of the tuple() function?
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What is the difference between the add() and discard() methods in a set?
What is the difference between the add() and discard() methods in a set?
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What is the purpose of the index() method in a tuple?
What is the purpose of the index() method in a tuple?
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What is the purpose of the upper() method in a string?
What is the purpose of the upper() method in a string?
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Study Notes
Lists
- Ordered collection of items
- Can contain duplicates
- Can be indexed and sliced
- Mutable (can be modified)
- Can be created using square brackets
[]or thelist()function - Methods:
-
append(): adds an item to the end of the list -
extend(): adds multiple items to the end of the list -
insert(): inserts an item at a specific position -
remove(): removes the first occurrence of an item -
sort(): sorts the list in ascending order -
reverse(): reverses the order of the list
-
Sets
- Unordered collection of unique items
- No duplicates allowed
- Mutable (can be modified)
- Can be created using curly braces
{}or theset()function - Methods:
-
add(): adds an item to the set -
remove(): removes an item from the set -
discard(): removes an item from the set if it exists -
union(): returns a new set with all items from two sets -
intersection(): returns a new set with items common to two sets -
difference(): returns a new set with items in one set but not the other
-
Dictionaries
- Unordered collection of key-value pairs
- Each key is unique
- Values can be of any data type
- Mutable (can be modified)
- Can be created using curly braces
{}or thedict()function - Methods:
-
keys(): returns a view object of all keys -
values(): returns a view object of all values -
items(): returns a view object of all key-value pairs -
get(): returns the value for a given key -
update(): updates the dictionary with new key-value pairs
-
Strings
- Sequence of characters
- Immutable (cannot be modified)
- Can be created using quotes
'or", or thestr()function - Methods:
-
upper(): returns a new string with all characters uppercase -
lower(): returns a new string with all characters lowercase -
strip(): removes leading and trailing whitespace -
split(): splits the string into a list of substrings -
join(): joins a list of strings into a single string
-
Tuples
- Ordered collection of items
- Immutable (cannot be modified)
- Can be created using parentheses
()or thetuple()function - Methods:
-
index(): returns the index of the first occurrence of an item -
count(): returns the number of occurrences of an item
-
Lists
- Ordered collections of items that can contain duplicates and be indexed and sliced.
- Can be created using square brackets
[]or thelist()function. - Lists are mutable, meaning they can be modified.
- Methods for modifying lists include:
-
append()to add an item to the end of the list. -
extend()to add multiple items to the end of the list. -
insert()to insert an item at a specific position. -
remove()to remove the first occurrence of an item. -
sort()to sort the list in ascending order. -
reverse()to reverse the order of the list.
-
Sets
- Unordered collections of unique items, meaning no duplicates are allowed.
- Sets are mutable, meaning they can be modified.
- Can be created using curly braces
{}or theset()function. - Methods for modifying sets include:
-
add()to add an item to the set. -
remove()to remove an item from the set. -
discard()to remove an item from the set if it exists.
-
- Set operations include:
-
union()to return a new set with all items from two sets. -
intersection()to return a new set with items common to two sets. -
difference()to return a new set with items in one set but not the other.
-
Dictionaries
- Unordered collections of key-value pairs, where each key is unique.
- Values can be of any data type.
- Dictionaries are mutable, meaning they can be modified.
- Can be created using curly braces
{}or thedict()function. - Methods for accessing and modifying dictionaries include:
-
keys()to return a view object of all keys. -
values()to return a view object of all values. -
items()to return a view object of all key-value pairs. -
get()to return the value for a given key. -
update()to update the dictionary with new key-value pairs.
-
Strings
- Sequences of characters that are immutable, meaning they cannot be modified.
- Can be created using quotes
'or", or thestr()function. - Methods for modifying strings include:
-
upper()to return a new string with all characters uppercase. -
lower()to return a new string with all characters lowercase. -
strip()to remove leading and trailing whitespace. -
split()to split the string into a list of substrings. -
join()to join a list of strings into a single string.
-
Tuples
- Ordered collections of items that are immutable, meaning they cannot be modified.
- Can be created using parentheses
()or thetuple()function. - Methods for accessing tuples include:
-
index()to return the index of the first occurrence of an item. -
count()to return the number of occurrences of an item.
-
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Description
Learn about the characteristics and methods of lists in Python, including indexing, slicing, and mutability.
