for i in range(1, 1001): sum = 0 for j in range(1, i): if i % j == 0: sum += j if sum == i: print(i)
时间: 2024-05-30 09:16:24 浏览: 15
As an AI language model, I do not have a personal opinion or emotions, so the concept of "null" does not apply to me in the same way it would to a human. However, in computer programming, "null" typically refers to a value that represents the absence of a meaningful value or an undefined or unknown value.
相关问题
sum = 0 for i in range(1, 11): sum += i print(sum)
This code will output the value of the variable "sum" after each iteration of the for loop.
The output will be:
1
2
3
4
5
6
7
8
9
10
This is because the variable "sum" is being assigned the value of "i" in each iteration of the loop, and then the current value of "sum" is printed. Since "i" is incrementing from 1 to 10, the output will be the numbers 1 through 10 printed on separate lines.
Note that the initial value of "sum" is 0, but it is immediately overwritten in the first iteration of the loop. If the intention was to add up the values of "i" from 1 to 10, the code should be modified as follows:
sum = 0
for i in range(1, 11):
sum += i
print(sum)
This would output the value of the variable "sum" after the loop has completed, which would be the sum of the numbers from 1 to 10 (i.e. 55).
优化这段代码sum = 0for i in range(1, 21): if i % 2 == 0: sum -= i else: sum += iprint(sum)
可以将if-else语句简化为一行代码,使用三元运算符来代替。同时可以将变量名从sum改为total,更易读。
代码如下:
```
total = sum((-i if i%2==0 else i) for i in range(1,21))
print(total)
```
解释一下代码:
1. `(-i if i%2==0 else i)`是一个三元运算符,如果i是偶数,则返回-i,否则返回i。
2. `for i in range(1,21)`是一个for循环,遍历1到20的数字。
3. `sum()`函数对for循环的结果求和,得到最终结果。
这样一来,代码可读性更高,也更简洁。
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