Python Swap Two Elements at Specified Positions in a List

Document 对象参考手册Python3 Examples

Define a list and swap two elements at specified positions in the list.

For example, swap the first and third elements:

对调前 : List = [23, 65, 19, 90], pos1 = 1, pos2 = 3
对调后 : [19, 65, 23, 90]

Example 1

def swapPositions(list, pos1, pos2):
     
    list[pos1], list[pos2] = list[pos2], list[pos1]
    return list
 
List = [23, 65, 19, 90]
pos1, pos2  = 1, 3
 
print(swapPositions(List, pos1-1, pos2-1))

The output of the above example is:

[19, 65, 23, 90]

Example 2

def swapPositions(list, pos1, pos2):
     
    first_ele = list.pop(pos1)    
    second_ele = list.pop(pos2-1)
     
    list.insert(pos1, second_ele)  
    list.insert(pos2, first_ele)  
     
    return list
 
List = [23, 65, 19, 90]
pos1, pos2  = 1, 3
 
print(swapPositions(List, pos1-1, pos2-1))

The output of the above example is:

[19, 65, 23, 90]

Example 3

def swapPositions(list, pos1, pos2):
 
    get = list[pos1], list[pos2]
       
    list[pos2], list[pos1] = get
       
    return list
 
List = [23, 65, 19, 90]
 
pos1, pos2  = 1, 3
print(swapPositions(List, pos1-1, pos2-1))

The output of the above example is:

[19, 65, 23, 90]

Document 对象参考手册Python3 Examples

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