Python 如何从列表中删除多个项

为了从列表中删除多个项，我们可以使用各种方法。假设我们有如下输入列表：

["David","Jacob", "Harry", "Mark", "Anthony", "Steve", "Chris"]

以下是当多个元素“David”和“Harry”被删除时的输出：

["Jacob", "Mark", "Anthony", "Steve", "Chris"]

从列表中移除多个项目

示例

要从列表中移除多个项目，请使用 del 关键字。del 允许您使用方括号将要删除的项目添加到一个范围中：

# Creating a List
mylist = ["David","Jacob", "Harry", "Mark", "Anthony", "Steve", "Chris"]

# Displaying the List
print("List = ",mylist)

# Remove multiple items from a list using del keyword
del mylist[2:5]

# Display the updated list
print("Updated List = ",list(mylist))

输出

List =  ['David', 'Jacob', 'Harry', 'Mark', 'Anthony', 'Steve', 'Chris']
Updated List =  ['David', 'Jacob', 'Steve', 'Chris']

使用列表推导式从列表中删除多个项

示例

要从列表中删除多个项，我们也可以使用列表推导式。在这种情况下，我们首先将要删除的元素设置为一个集合，然后将其添加到列表推导式中以删除它们。

# Creating a List
mylist = ["David","Jacob", "Harry", "Mark", "Anthony", "Steve", "Chris"]

# Displaying the List
print("List = ",mylist)

# Remove the following multiple items
delItems = {"David","Anthony","Chris"}

# List Comprehension to delete multiple items
resList = [i for i in mylist if i not in delItems]

# Display the updated list
print("Updated List = ",resList)

输出

List =  ['David', 'Jacob', 'Harry', 'Mark', 'Anthony', 'Steve', 'Chris']
Updated List =  ['Jacob', 'Harry', 'Mark', 'Steve']

使用remove()方法从列表中删除多个项

示例

在这个示例中，我们将从列表中删除多个项。被删除的项是可被5整除的项−

# Creating a List
mylist = [2, 7, 10, 14, 20, 25, 33, 38, 43]

# Displaying the List
print("List = ",mylist)

# Delete multiple items (divisible by 5)
for i in list(mylist):
   if i % 5 == 0:
      mylist.remove(i)

# Display the updated list
print("Updated List = ",mylist)

输出

List =  [2, 7, 10, 14, 20, 25, 33, 38, 43]
Updated List =  [2, 7, 14, 33, 38, 43]

删除列表中的多个项目

示例

在这里，我们将获得要删除的项目的索引 –

# Creating a List
mylist = ["David","Jacob", "Harry", "Mark", "Anthony", "Steve", "Chris"]

# Displaying the List
print("List = ",mylist)

# Remove the items at the following indexes
delItemsIndex = [1, 4]

# List Comprehension to delete multiple items
for i in sorted(delItemsIndex, reverse = True):
   del mylist[i]

# Display the updated list
print("Updated List = ",mylist)

输出

List =  ['David', 'Jacob', 'Harry', 'Mark', 'Anthony', 'Steve', 'Chris']
Updated List =  ['David', 'Harry', 'Mark', 'Steve', 'Chris']