ListA list is a collection which is ordered and changeable. In Python lists are written with square brackets. |
List ExampleRYB_color = ["Red","Yellow","Blue"]
print(RYB_color)
>>>['Red','Yellow','Blue']
|
Access ItemsRYB_color = ["Red","Yellow","Blue"]
| print(RYB_color[1])
>>> 'Yellow'
| print(RYB_color[-2])
>>> 'Yellow'
|
Range of IndexesRYB_Secondary = ["Red","Yellow","Blue","Orange","Green","Purple"]
Example 1
print(RYB_Secondary[1:5]
>>>['Yellow','Blue','Orange','Green']
| Note: Index 5 is not included. | Example 2
print(RYB_Secondary[-5:-2]
>>>['Yellow','Blue','Orange','Green']
| Note: Index -2 is not included. | Example 3
print(RYB_Secondary[:5]
>>>['Red','Yellow','Blue','Orange','Green']
| Note: By leaving out the start value, the range will start at the first item. | Example 4
print(RYB_Secondary[1:]
>>>['Yellow','Blue','Orange','Green','Purple']
| Note: By leaving out the end value, the range will go on to the end of the list. |
| | List LengthRYB_color = ["Red","Yellow","Blue"]
print(len(RYB_color))
>>> 3
|
Change Item ValueRYB_color = ["Red","Yellow","Blue"]
RYB_color[1] = "Green"
print(RYB_color)
>>>['Red','Green','Blue']
|
Add ItemsRYB_color = ["Red","Yellow","Blue"]
| Using the append() method to append an item in the and of the list. | RYB_color.append("White")
>>> ['Red','Yellow','Blue','White']
| Use the insert() method to add an item at the specified index. | RYB_color.insert(2,"White")
>>> ['Red','Yellow','White','Blue']
|
Delete ItemsRYB_color = ["Red","Yellow","Blue"]
| RYB_color.remove("Yellow")
| #remove the item "Yellow"
| RYB_color.pop()
| #remove the indicated
index or the last item
if index not specified.
In this case the
item "Blue" will be
removed
| del RYB_color[1]
| #remove the item "Yellow"
| del RYB_color
| #delete the whole list
| RYB_color.clear()
| #return an empty list
|
Check if Item ExistsRYB_color = ["Red","Yellow",Blue"]
if "Yellow" in RYB_color:
print("Yes")
|
|
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