Python Array List

Implement Array Lists 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 list is a collection which is ordered and changeable allowing duplicate members. Lists are created using square brackets..

Common Functions For Manipulating Lists In Python

Common List Functions

Sample Ojamboshop.com Learning Python List Functions

Name	Description	Example
len()	Determine how many items	len(even_numbers)
append()	Append items	even_numbers.append(12)
insert()	Insert item at specified index	even_numbers.insert(1, 2)
remove()	Remove specified item	even_numbers.remove(2)
pop()	Pop the item at specified index	even_numbers.pop(1)
del	Delete the item at specified index	del even_numbers[1]
clear()	Remove all values	even_numbers.clear()
sort()	Sort in ascending order	even_numbers.sort()
reverse()	Sort in reverse order	even_numbers.reverse()
copy()	Make a copy	even_numbers.sort()
extend()	Add elements from one list	list1.extend(list2)
count()	Returns number of elements with specified value	list1.count(2)
index()	Returns index of first element with specified value	list1.count(4)
Name	Description	Example

Python List Snippet

# OjamboShop.com Learning Python Array List Tutorial #
even_numbers = [2,4,6,8,10]
print(even_numbers)
print(len(even_numbers)) # Number Of Items In List
duplicate_list = [2,4,6,8,10,2,4,6,8,10]
print(duplicate_list)
print(duplicate_list[1]) # Access List Item By Index Number
print(duplicate_list[2:5]) # Range Of Indexes
even_numbers[4] = 12 # Change Item Value By Index Number
print(even_numbers)
even_numbers.append(14) # Add Item To End
print(even_numbers)
even_numbers.insert(1, 2) # Insert Item Value At Index Number
print(even_numbers)
even_numbers.remove(2) # Remove Item Value
print(even_numbers)
even_numbers.pop(1) # Pop Item At Index Number
print(even_numbers)
del even_numbers[1] # Remove Item At Index Number
print(even_numbers)
even_numbers.clear() # Remove All Items
print(even_numbers)
even_numbers.sort() # Sort All Items In Ascending Order
print(even_numbers)
even_numbers.reverse() # Sort All Items In Reverse Order
print(even_numbers)
copied_list = even_numbers.copy() # Make A Copy
print(copied_list)
list1 = ["John", "Jake"]
list2 = even_numbers.copy()
list3 = list1 + list2 # Join Two Lists
list1.extend(list2) # Add Elements From One List
print(list1)
print(list3)
print(list1.count("John")) # Returns Number Of Times The Value "John" Appears
print(list1.index("John")) # Returns Index Of First Time The Value "John" Appears

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 lists.

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 lists. Use lists when you need an ordered, changeable array that might have duplicate members.

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