The usage of for Loop and list in python
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List = [1,2,3,4,5,]
Modify the value:
List [2] = 500
Print (list)
[1, 2, 500, 4, 5]
Value according to the index:
For index in range (len (list)):
Print (ListIndex)
one
two
five hundred
four
five
Direct value:
For item in list:
Print (item)
one
two
five hundred
four
five
Index and value are obtained at the same time:
For index, item in enumerate (list):
Print (index, item)
0 1
1 2
2 500
3 4
4 5
Additional
List.append (7)
Print (list)
[1, 2, 500, 4, 5, 7]
Add to specified location
List.insert (1,9)
Print (list)
[1, 9, 2, 500, 4, 5, 7]
List merger
List.extend ([222333])
Print (list)
[1, 9, 2, 500, 4, 5, 7, 222, 333]
List deletion
If 2 in list: list.remove (2)
Print (list)
[1, 9, 500, 4, 5, 7, 222, 333]
Pop operation
List.pop ()
333 # removed value
Print (list)
[1, 9, 500, 4, 5, 7, 222]
Specify index removal
List.pop (0)
1 # removed value
Print (list)
[9, 500, 4, 5, 7, 222]
Clear the list
List.clear ()
Print (list)
[]
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