A super-detailed summary of common methods for python lists.

What's the list?

A list consists of a series of elements arranged in a particular order. You can create lists containing all the letters of the alphabet, the numbers 0 to 9, the names of all family members, and so on, or you can put anything into a list, where the elements can have no relationship to each other. Given that lists often contain multiple elements, assigning a name to the list that denotes the plural (such as names, digits, or letters) is a good idea In python, lists are denoted by square brackets [ ] and commas are used to separate the elements within them.

List of common methods

()

Define the append() method to append elements to the end of the list. 💡 As a chestnut 💡 Adding elements to a list of fruits

fruits = ['apple', 'banana', 'cherry']
("orange")
print(fruits)

The results of the run are as follows:

['apple', 'banana', 'cherry', 'orange']

()

Define the clear() method to clear the list of all elements 💡 As a chestnut 💡 Clear fruits of all elements (return empty list)

fruits = ['apple', 'banana', 'cherry', 'orange']
()
print(fruits)

The results of the run are as follows:

[]

()

Define the copy() method to return a copy of the specified list (copy list) 💡 as a chestnut 💡 copy fruits list

fruits = ['apple', 'banana', 'cherry', 'orange']
c = ()
print(c)

The results of the run are as follows:

['apple', 'banana', 'cherry', 'orange']

()

Define the count() method to return the number of occurrences of an element 💡 As a chestnut 💡 Returns the number of times "cherry" appears in the fruits list

fruits = ['apple', 'banana', 'cherry']
number = ("cherry")
print(number)

The results of the run are as follows:

1

()

Definition The extend() method adds a list element (or any iterable element) to the end of the current list 💡 As a chestnut 💡 Add elements from cars to the fruits list

fruits = ['apple', 'banana', 'cherry']
cars = ['Porsche', 'BMW', 'Volvo']
(cars)
print(fruits)

The results of the run are as follows:

['apple', 'banana', 'cherry', 'Porsche', 'BMW', 'Volvo']

()

Define the index() method to return the minimum index value of the element (an error will be reported if the element is not found) 💡 as a chestnut 💡 to return the minimum index value of the element "cherry".

fruits = ['apple', 'banana', 'cherry']
x = ("cherry")
print(x)

The results of the run are as follows:

2

()

Definition Inserts the element at the specified position 💡 As an example 💡 Inserts the element "orange" into the fruits list at index 1.

fruits = ['apple', 'banana', 'cherry']
(1, "orange")
print(fruits)

The results of the run are as follows:

['apple', 'orange', 'banana', 'cherry']

()

Define the reverse() method to reverse the sort order of the elements 💡 As a chestnut 💡 Reverse the list of fruits

fruits = ['apple', 'banana', 'cherry']
()
print(fruits)

The results of the run are as follows:

['cherry', 'banana', 'apple']

()

Define the first element of the remove() method to have the specified value 💡 As a chestnut 💡 Remove the "banana" element of the fruits list

fruits = ['apple', 'banana', 'cherry']
("banana")
print(fruits)

The results of the run are as follows:

['apple', 'cherry']

()

Define pop() to delete the element at the specified position 💡 as a chestnut 💡 to delete the "banana" element of the fruits list (specify the index of the element)

fruits = ['apple', 'banana', 'cherry']
(1)
print(fruits)

The results of the run are as follows:

['apple', 'cherry']

()

Definition By default, the sort() method sorts the list in ascending order 💡 As a chestnut 💡 Sort the list of cars alphabetically

cars = ['Porsche', 'BMW', 'Volvo']
()
print(cars)

The results of the run are as follows:

['BMW', 'Porsche', 'Volvo']

Extend reverse=True to sort the list in descending order. The default is reverse=False 💡 as a chestnut 💡 to sort the list of cars in descending order.

cars = ['Porsche', 'BMW', 'Volvo']
(reverse=True)
print(cars)

The results of the run are as follows:

['Volvo', 'Porsche', 'BMW']

These are the common methods of organizing lists

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