从每个数字中减去 K 的Python程序

给定一个列表，任务是编写一个Python程序，从每个数字中减去 K，如果元素低于 0，则保留 0。

例子：

Input : test_list = [2345, 8786, 2478, 8664, 3568, 28], K = 4

Output : [1, 4342, 34, 4220, 124, 4]

Explanation : In 2345, 4 subtracted from 2 is -2, hence ceiled to 0. Hence just 5-4 = 1, is retained. and thus output.

Input : test_list = [2345, 8786, 2478, 8664, 3568, 28], K = 3

Output : [12, 5453, 145, 5331, 235, 5]

Explanation : In 2345, 3 subtracted from 2 is -1, hence ceiled to 0. Hence just 5-3 = 2 and 4-3 = 1, are retained. and thus output.

方法一：使用str() + –运算符

在此，我们将整数转换为字符串并通过将每个数字转换为整数来执行减法，结果再次连接并将类型转换回整数。

Python3

# Python3 code to demonstrate working of
# Subtract K from each digit
# Using str() and - operator
  
# initializing list
test_list = [2345, 8786, 2478, 8664, 3568, 28]
               
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = 4
  
res = []
for ele in test_list:
    str_ele = str(ele)
      
    # getting maximum of 0 or negative value using max()
    # conversion of each digit to int
    new_ele = int(''.join([ str(max(0, int(el) - K)) for el in str_ele]))
    res.append(new_ele)
  
# printing result
print("Elements after subtracting K from each digit : " + str(res))

输出：

The original list is : [2345, 8786, 2478, 8664, 3568, 28]

Elements after subtracting K from each digit : [1, 4342, 34, 4220, 124, 4]

方法 2：使用列表理解

与上述方法类似，仅使用列表理解来提供速记的任务。

蟒蛇3

# Python3 code to demonstrate working of
# Subtract K from each digit
# Using list comprehension
  
# initializing list
test_list = [2345, 8786, 2478, 8664, 3568, 28]
               
# printing original list
print("The original list is : " + str(test_list))
  
# initializing K 
K = 4
  
# list comprehension providing shorthand
res = [int(''.join([ str(max(0, int(el) - K)) for el in str(ele)]))
       for ele in test_list]
  
# printing result
print("Elements after subtracting K from each digit : " + str(res))

输出：

The original list is : [2345, 8786, 2478, 8664, 3568, 28]

Elements after subtracting K from each digit : [1, 4342, 34, 4220, 124, 4]