Python - 自定义下界列表

给定一个列表，为其分配一个自定义下限值。

Input : test_list = [5, 7, 8, 2, 3, 5, 1], K = 3 
Output : [5, 7, 8, 3, 3, 5, 3] 
Explanation : All elements less than 3, assigned 3.

Input : test_list = [5, 7, 8, 2, 3, 5, 1], K = 5 
Output : [5, 7, 8, 5, 5, 5, 5] 
Explanation : All elements less than 5, assigned 5. 

方法#1：使用列表理解

在这里，我们检查每个元素是否低于下限，如果是，则将决定的下限分配给该元素。

Python3

# Python3 code to demonstrate working of 
# Custom Lowerbound a List
# Using list comprehension
  
# initializing list
test_list = [5, 7, 8, 2, 3, 5, 1]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing Lowerbound
K = 4 
  
# checking for elements and assigning Lowerbounds
res = [ele if ele >= K else K for ele in test_list]
  
# printing result 
print("List with Lowerbounds : " + str(res))

输出

The original list is : [5, 7, 8, 2, 3, 5, 1]
List with Lowerbounds : [5, 7, 8, 4, 4, 5, 4]

方法 #2：使用列表理解 + max()

在这种情况下，我们使用 max() 进行比较，分配元素的最大值或决定的下限。

蟒蛇3

# Python3 code to demonstrate working of 
# Custom Lowerbound a List
# Using list comprehension + max()
  
# initializing list
test_list = [5, 7, 8, 2, 3, 5, 1]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing Lowerbound
K = 4 
  
# max() is used to compare for Lowerbound
res = [max(ele, K) for ele in test_list]
  
# printing result 
print("List with Lowerbounds : " + str(res))

输出

The original list is : [5, 7, 8, 2, 3, 5, 1]
List with Lowerbounds : [5, 7, 8, 4, 4, 5, 4]