List
A list is a collection which is ordered and changeable. In Python lists are written with square brackets. |
List Example
RYB_color = ["Red","Yellow","Blue"]
print(RYB_color)
>>>['Red','Yellow','Blue']
|
Access Items
RYB_color = ["Red","Yellow","Blue"]
|
print(RYB_color[1])
>>> 'Yellow'
|
print(RYB_color[-2])
>>> 'Yellow'
|
Range of Indexes
RYB_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 Length
RYB_color = ["Red","Yellow","Blue"]
print(len(RYB_color))
>>> 3
|
Change Item Value
RYB_color = ["Red","Yellow","Blue"]
RYB_color[1] = "Green"
print(RYB_color)
>>>['Red','Green','Blue']
|
Add Items
RYB_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 Items
RYB_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 Exists
RYB_color = ["Red","Yellow",Blue"]
if "Yellow" in RYB_color:
print("Yes")
|
|
Created By
Metadata
Favourited By
Comments
No comments yet. Add yours below!
Add a Comment
Related Cheat Sheets
More Cheat Sheets by Nouha_Thabet