从Python列表中删除多个元素

给定一个数字列表，编写一个Python程序，根据给定条件从列表中删除多个元素。

例子：

Input: [12, 15, 3, 10]
Output: Remove = [12, 3], New_List = [15, 10]

Input: [11, 5, 17, 18, 23, 50]
Output: Remove = [1:5], New_list = [11, 50]

根据我们对数据的了解，可以从Python中的列表中删除多个元素。就像，我们只知道要删除的值或者也知道这些值的索引。让我们根据不同的场景来看看不同的例子。

示例 #1：假设我们要删除列表中可被 2 或所有偶数整除的每个元素。

Python3

# Python program to remove multiple
# elements from a list
 
# creating a list
list1 = [11, 5, 17, 18, 23, 50]
 
# Iterate each element in list
# and add them in variable total
for ele in list1:
    if ele % 2 == 0:
        list1.remove(ele)
 
# printing modified list
print("New list after removing all even numbers: ", list1)

输出：

New list after removing all even numbers:  [11, 5, 17, 23]

示例 #2：使用列表推导
删除列表中的所有偶数元素与仅包括所有非偶数元素（即奇数元素）一样好。

Python3

# Python program to remove multiple
# elements from a list
 
# creating a list
list1 = [11, 5, 17, 18, 23, 50]
 
# will create a new list,
# excluding all even numbers
list1 = [ elem for elem in list1 if elem % 2 != 0]
 
print(*list1)

输出：

11 5 17 23

示例 #3：使用列表切片删除相邻元素
下面的Python代码从索引 1 到 4 中删除值。

Python3

# Python program to remove multiple
# elements from a list
 
# creating a list
list1 = [11, 5, 17, 18, 23, 50]
 
# removes elements from index 1 to 4
# i.e. 5, 17, 18, 23 will be deleted
del list1[1:5]
 
print(*list1)

输出：

11 50

示例 #4：使用列表推导
假设要删除的元素是已知的，而不是那些元素的索引。在这种情况下，我们可以直接消除这些元素，而不用关心我们将在下一个示例中看到的索引。

Python3

# Python program to remove multiple
# elements from a list
 
# creating a list
list1 = [11, 5, 17, 18, 23, 50]
 
# items to be removed
unwanted_num = {11, 5}
 
list1 = [ele for ele in list1 if ele not in unwanted_num]
 
# printing modified list
print("New list after removing unwanted numbers: ", list1)

输出：

New list after removing unwanted numbers:  [17, 18, 23, 50]

示例 #5：当元素的索引已知时。
虽然元素的索引是已知的，但随机删除元素会改变索引的值。因此，始终建议首先删除最大的索引。使用此策略，较小值的索引将不会更改。我们可以对列表进行倒序排序，并按降序删除列表中的元素。

Python3

# Python program to remove multiple
# elements from a list
 
# creating a list
list1 = [11, 5, 17, 18, 23, 50]
 
# given index of elements
# removes 11, 18, 23
unwanted = [0, 3, 4]
 
for ele in sorted(unwanted, reverse = True):
    del list1[ele]
 
# printing modified list
print (*list1)

输出：

5 17 50