Create a list

#Create an empty list
MyArray = []


#Create a list with initial values
MyArray = [10, 13, 46, 28]

#Create a list 5 entries long containing 0
my_list = [0 for i in range(5)]

Multiple data types

A list can contain different data types

MyArray = ["Dave", 13, 46, True, 0.3]

Multi dimension lists

See here

Access list items

print(MyArray[2])

#You can also access in reverse in python by using negative indexes
print(MyArray[-1])    #Will print the last item in the list
print(MyArray[-2])    #Will print the second to last item in the list

Get a slice of list items

MyNewArray = MyArray[2:6]    #New array has items from index 2 to 5 (2nd parameter is 1 more than that wanted)


MyNewArray = MyArray[:3]     #New array has first 3 items from index
MyNewArray = MyArray[-2:]    #New array has last 2 items from index

Manipulate lists

Add list items

MyArray.append('Hi')      #Add to end

MyArray.insert(0, 'Hi')   #Insert at index 0

Joins 2 lists / concatenate

MyArray = [10, 13, 46, 28]
MyArrayNew = MyArray + [13, 22]

Remove list item

#Remove at index
MyArray.pop(2)        #Remove the list item at index 2
Item = MyArray.pop()  #Remove the list item at the last index and assign its value to the variable Item


#Remove item with value
MyArray.remove('Hi')    #Remove the first list item that matches the string specified (will error if not present)

Length

Length = len(MyArray)

Sort List

You can sort values and also strings alphabetically

#Sort an array
MyArray.sort()    #Just this (no need for MyArray= )
MyArray.sort(reverse=True)    #Sort in reverse order

#Copy an array and then sort it
MyNewArray = sorted(MyArray)

How many times does value occur in a list

NumOfTimes = MyArray.count('Hi')