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']
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Access Items
RYB_color = ["Red","Yellow","Blue"]
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print(RYB_color[1])
>>> 'Yellow'
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print(RYB_color[-2])
>>> 'Yellow'
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Range of Indexes
RYB_Secondary = ["Red","Yellow","Blue","Orange","Green","Purple"]
Example 1
print(RYB_Secondary[1:5]
>>>['Yellow','Blue','Orange','Green']
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Note: Index 5 is not included. |
Example 2
print(RYB_Secondary[-5:-2]
>>>['Yellow','Blue','Orange','Green']
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Note: Index -2 is not included. |
Example 3
print(RYB_Secondary[:5]
>>>['Red','Yellow','Blue','Orange','Green']
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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']
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Note: By leaving out the end value, the range will go on to the end of the list. |
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List Length
RYB_color = ["Red","Yellow","Blue"]
print(len(RYB_color))
>>> 3
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Change Item Value
RYB_color = ["Red","Yellow","Blue"]
RYB_color[1] = "Green"
print(RYB_color)
>>>['Red','Green','Blue']
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Add Items
RYB_color = ["Red","Yellow","Blue"]
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Using the append()
method to append an item in the and of the list. |
RYB_color.append("White")
>>> ['Red','Yellow','Blue','White']
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Use the insert()
method to add an item at the specified index. |
RYB_color.insert(2,"White")
>>> ['Red','Yellow','White','Blue']
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Delete Items
RYB_color = ["Red","Yellow","Blue"]
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RYB_color.remove("Yellow")
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#remove the item "Yellow"
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#remove the indicated
index or the last item
if index not specified.
In this case the
item "Blue" will be
removed
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#remove the item "Yellow"
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Check if Item Exists
RYB_color = ["Red","Yellow",Blue"]
if "Yellow" in RYB_color:
print("Yes")
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