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Vicki Langer
Vicki Langer

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Charming the Python: Tuples

#python #beginners

If coding tutorials with math examples are the bane of your existence, keep reading. This series uses relatable examples like dogs and cats.

Tuples

A tuple can be a collection of multiple data types. Tuples are ordered and immutable. Immutable means unchangeable or unmodifiable.

Creating 

# empty tuple to show syntax empty_tuple = () # A not empty tuple dogs = ('chihuahua', 'golden retriever', 'german shepherd', 'mutt')
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Accessing Items

You can access items in a tuple similar to accessing characters in a string.

chihuahua golden retriever german shepherd mutt
0 1 2 3
-4 -3 -2 -1 
dogs = ('chihuahua', 'golden retriever', 'german shepherd', 'mutt') print(dogs[1]) >>> golden retreiver print(dogs[-2]) >>> german shepherd
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Slicing 

dogs = ('chihuahua', 'golden retriever', 'german shepherd', 'mutt') print(dogs[1:2]) # will print index 1 to 2 >>> golden retriever, german shepherd print(dogs[-3:-1]) # will print index -3 up to but not including -1 >>> golden retriever, german shepherd
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Casting to a List

Tuples are immutable/not-changeable, while lists are mutable/changeable.
In order to update the contents of a tuple, you may change a tuple into a list. This is call casting into a list.

dogs = ('chihuahua', 'golden retriever', 'german shepherd', 'mutt') dogs_list = list(dogs)
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After making adjustments to your new lest, don't forget to change it back to a tuple.

dogs_list = ['chihuahua', 'golden retriever', 'german shepherd', 'mutt'] dogs = tuple(dogs_list)
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Joining 

dogs = ('chihuahua', 'golden retriever', 'german shepherd', 'mutt') cats = ('domestic shorthair', 'persian', 'siamese') pets = dogs + cats print(pets) >>> chihuahua, golden retriever, german shepherd, mutt, domestic shorthair, Persian, siamese
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Deleting

Because tuples are immutable, you cannot delete single items in a tuple. However, you can delete a whole tuple

dogs = ('chihuahua', 'golden retriever', 'german shepherd', 'mutt') del dogs print(dogs) # this will error because 'dogs' no longer exists
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Series based on

asabeneh

30 Days Of Python Challenge

Asabeneh ・ Nov 20 '19

#python #javascript #react #mongodb

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