Implement Array Sets In Python
An array specifies a variable that can be indexed as a list in rows and columns.
The first index is zero as is common is most programming languages. Python does not have an array data type. Instead the data type list, tuple, set or dictionary can be used.
A set is a collection which is ordered and unchangeable not allowing duplicate members. Sets are created using curly brackets..
Common Functions For Manipulating Sets In Python
Common Set Functions
| Name | Description | Example |
|---|---|---|
| len() | Determine how many items | len(fruits) |
| add() | Add one item | fruits.add(“Orange”) |
| update() | Add elements from one set | fruits.update(“fruits2”) |
| remove() | Remove specified item | fruits.remove(“Banana”) |
| discard() | Discard specified item | fruits.discard(“Cranberry”) |
| clear() | Remove all values | fruits.clear() |
| difference() | Returns a set containing the difference between two or more sets | set3.difference(set2) |
| difference_update() | Removes the items in this set that are also included in another, specified set | set1.difference_update(set2) |
| intersection() | Returns a set, that is the intersection of two other sets | set3 = set1 & set2 |
| intersection_update() | Returns a set, that is the intersection of two other sets | set1.intersection_update(set2) |
| symmetric_difference() | Returns a set with the symmetric differences of two sets | set3 = set1.symmetric_difference(set2) |
| symmetric_difference_update() | Inserts the symmetric differences from this set and another | set3 = set1.symmetric_difference_update(set2) |
| union() | Return a set containing the union of sets | set3 = set1.union(set2) |
| count() | Number of elements with specific value | set1.count(2) |
| index() | Returns index of first element with specified value | set1.index(4) |
| Name | Description | Example |
Python Set Snippet
# OjamboShop.com Learning Python Array Set Tutorial #
fruits = {"Apple", "Banana", "Cranberry"}
print(fruits)
print(len(fruits)) # Number Of Items In Set
fruits.add("Orange") # Add Item To Set
print(fruits)
fruits2 = {"pineapple", "mango"}
fruits.update(fruits2) # Add Items From Another Set
print(fruits)
fruits.remove("pineapple") # Remove Item From Set
print(fruits)
fruits.discard("pineapple") # Discard Item From Set
print(fruits)
fruits.clear() # Remove All Items
print(fruits)
set1 = {"AA", "BB", "CC"}
set2 = {11, 22, 33}
set3 = set1.union(set2) # New Set With All Items From Both Sets
print(set3)
Usage
You can use any IDE or text editor and the command line to compile and execute Python code. For this tutorial, the OjamboShop.com Learning Python Course Web IDE can used to input and compile Python code for sets.
Open Source
Python is licensed under the Python Software Foundation License. This allows commercial use, modification, distribution, and allows making derivatives proprietary.
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Conclusion:
Python makes it easy to use sets. Use sets when you need an unordered, unchangeable array without duplicate members such as unique memberships.
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