如何使用 Python 以相反的順序迭代序列?


Python 序列包括字串、列表、元組等。我們可以使用不同的方法合併 Python 序列中的元素。讓我們看一些反向迭代列表的示例。

使用 while 迴圈反向迭代

示例

在此示例中,我們有一個列表作為序列,並使用 while 迴圈反向迭代它 -

# Creating a List mylist = ["Jacob", "Harry", "Mark", "Anthony"] # Displaying the List print("List = ",mylist) # Length - 1 i = len(mylist) - 1 # Iterate in reverse order print("Display the List in Reverse order = ") while i >= 0 : print(mylist[i]) i -= 1

輸出

List =  ['Jacob', 'Harry', 'Mark', 'Anthony']
Display the List in Reverse order = 
Anthony
Mark
Harry
Jacob

使用 for 迴圈反向迭代

示例

在此示例中,我們有一個列表作為序列,並使用 for 迴圈反向迭代它 -

# Creating a List mylist = ["Jacob", "Harry", "Mark", "Anthony"] # Displaying the List print("List = ",mylist) # Iterate in reverse order print("Display the List in Reverse order = ") for i in range(len(mylist) - 1, -1, -1): print(mylist[i])

輸出

List =  ['Jacob', 'Harry', 'Mark', 'Anthony']
Display the List in Reverse order = 
Anthony
Mark
Harry
Jacob

使用 reversed() 反向迭代

示例

在此示例中,我們有一個列表作為序列,並使用 reversed() 方法反向迭代它 -

# Creating a List mylist = ["Jacob", "Harry", "Mark", "Anthony"] # Displaying the List print("List = ",mylist) # Iterate in reverse order using reversed() print("Display the List in Reverse order = ") [print (i) for i in reversed(mylist)]

輸出

List =  ['Jacob', 'Harry', 'Mark', 'Anthony']
Display the List in Reverse order = 
Anthony
Mark
Harry
Jacob

使用負索引反向迭代

示例

在此示例中,我們有一個列表作為序列,並使用負索引反向迭代它 

# Creating a List mylist = ["Jacob", "Harry", "Mark", "Anthony"] # Displaying the List print("List = ",mylist) # Iterate in reverse order using negative indexing print("Display the List in Reverse order = ") [print (i) for i in mylist[::-1]]

輸出

List =  ['Jacob', 'Harry', 'Mark', 'Anthony']
Display the List in Reverse order = 
Anthony
Mark
Harry
Jacob

更新日期:2022-09-16

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